Bleg Igneous-Textures And Other

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Basaltic Temp

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1000-1200

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SiO2 Content Basaltic Magma

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45-55

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SiO2 Content Andesitic Magma

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55-65

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Rhyolitic Tem

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650-800

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SiO2 Content Rhyolitic Magma

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65-75

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Andesitic Tem

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800-1000

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CAVITY: former vesicles are occuppied by late stage magmatic minerals

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AMYGDALOIDAL

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if vesicles have been filled with minerals

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Amygdular

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Xenormorphic, Allotriomorphic

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Anhderal

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textures where all crystals other than any phenocrysts present that cannot be distinguished by the naked eye

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Aphanitic

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aphanitic texture that are completely free of phenocrysts

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Aphyric

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All are anhedral

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Aplitic Texture

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RADIATE: with radiating fibers extending from either end of a linear nucleus rather than a point

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AXIOLITIC

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Minerals surrounding oikocryst

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Chadacrysts

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crystal diameter greater than 5mm

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Coarsed Grained

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INTERGROWTH: boundary involves interdigitations

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Consertal

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crystals are becoming unstable and reacting with its surroundng

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Coronas

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OVERGROWTH:a crystal of one mineral is surrounded by a rim or mantle of 1 or more crystals

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Coronas

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Smaller, spherical, rodlike and hairlike isotropic forms

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Crystalites

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Polymineralic clusters in a glomeroporphyritic texture

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Cumulocrysts

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Arrays of fibers having a branching pattern

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Dendritic

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Grains are of approximately same size

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Equigranular

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Idiomorphic, Automorphic

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Euhedral

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Rhyolitic Explosion Type

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explosive

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Crystal Diameter less than 1mm

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Fine grained

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Monomineralic Clusters in a glomeroporphyritic texture

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Glomerocrysts

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phenocrysts occur as clusters

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Glomeroporphyritic

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Phenocrysts are gathered in Distinct Clusters

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Glomeroporphyritic

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Mixtures of euhedral, anhedral and subhedral

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Granitic Texture

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INTERGROWTH: "graphic" structures of smoky quartz in alkali feldspars through simultaneous crystallization from a eutectic mixture

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GRAPHIC

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Broken Series of sizes

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Hiatal

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Rhyolitic Viscocity and Gas Content

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High

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Chem Content Basaltic Magma

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High Fe, Mg, Ca Low K, Na

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Composed of Wholly crystals

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Holocrystalline

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Composed of wholly glass

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Hyaline

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Ophitic texture wherein glass surrounds the plag laths

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Hyaloophitic

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Microlites of plag are more abindant than groundmass. Groundmass composed of lass with tiny interstices between plag grains

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Hyalopilitic

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Trachytic texture with glassy material in between feldspar

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Hyalopilitic

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more crystals than glass

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Hypocrystalline

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more glass than crystals

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Hypohyaline

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Grains are of different sizes

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Inequigranular

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Chem Content Magma

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Int Fe, Mg, Ca, Na, K

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Andesitic Viscocity and Gas Content

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Int. Viscosity

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angular interstices between plag grains are occuppied by grains of ferromagnesium minerals

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Intergranular

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Spaces between plagioclase laths are occuppied by 1 or more grains of px, ol or opaque mineral

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Intergranular

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Andesitic Explosion Type

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intermediate

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intertices between plag grains are occuppied by glass

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Intersertal

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Glass occuppies wedge-shaped interstices between plagioclase lath

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Intersertal

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OVERGOWTH: a corona overgrowth of px/hb/ol

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KELYPHITIC

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Basaltic Vicosity and Gas Content

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Low

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Chem Content Magma

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Low Fe, Mg, Ca High K, Na

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Crystal Diameter 1-5mm

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Medium Grained

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Minute Crystals, usually tabular or prismatic habit and birefringent

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Microlites

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Individual plag show abundance of glassy inclusions

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Moth eaten Texture

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Intergrowth of qtz and plag show small wormlike bodies of quartz

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Myrmekitic

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INTERGROWTH: patches of plag intergrown with vermicular quartz

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Myrmekitic

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with welded or devitrified glass with fragmented textures composed of rock fragments, crystals and glass

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Noncrystalline

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Basaltic Explosion Type

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nonexplosive

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contain concentrically banded spheres wherin the band consists of alternating light colored and dark colored minerals

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Obicular

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Latest to finish crystallizing in Poikilitic

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Oikocrysts

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1 big mineral in Poikilitic

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Oikocrysts

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lath of plag in a coarsed grained matrix of pyroxene crystals

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Ophitic

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Randomly Arranged Plagioclase chadacrysts are elongate and are wholly (poikilophitic) enclosed by augite oikocryst

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Ophitic

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Plag with concentric zones around a grain show thin zones of diff compositions

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Oscillatory Zoning

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Irregularly shaped Plag crystals showing different compositions

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Patchy Zoning

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Exsolution lamellae of albite occuring in orthoclase or microcline

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Perthictic Texture

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texture wherein minerals can be distinguished by the naked eye

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Phaneritic

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Trachytic texture with crystalline material in between feldspars

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Pilotaxitic

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smaller grains are completely enclosed in large grain of another mineral

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Poikilitic

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Relatively large crystal of 1 mineral(oikocryst) of one or more other mineral (chadacryst) which are randomly oriented

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Poikilitic

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Wholly surrounded by augite oikocryst

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Poikilophitic

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Phenocrysts are embedded in finer groundmass

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Porphyritic

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Another mineral taking the shape and form of a precursor minerl

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Pseudomorph

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Visicles form 50% or more of the rock and density less than 1

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Pumiceous

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OVERGROWTH: a corona texture char by an overgrowth of Na Plag or Kfelds

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Rapikivi

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Visicles form 50% or more of the rock and density more than 1

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Scoraceous

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Continuous ranges in sizes of crystals of the principal mineral

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Seriate

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Contain abundant, small interconnected box-shaped glass inclusions

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Sieved Texture

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With hollow and gaps, spaces filled with groundmass

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Skeletal and Embayed

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Spherical intergrowth of radiating quartz and feldspars replace glass

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Spherulitic

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RADIATE: composed of an aggregate of fibrous crystals radiating from a nucleus with glass or crystals in between

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SPHERULITIC

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Hypidiomorphic, Hypoautomorphic

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Subhedral

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plag are not completely enclosed in a matrix of px grains

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Subophilitic

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INTERGROWTH: Intimate intergrowth of 2 minerals in which one minerals has a vermicular habit

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SYMPLECTITE

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Subparellel arrangement of tabular, bladed, prismatic crystals which are visible to the naked eye

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Trachitoid

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plag show preferred orientation due to flowage, in between are occupied by glass

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Trachytic

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Subparellel arrangement of microcrystalline lath-shpaed feldspar in groundmass

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Trachytic

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RADIATE: fanlike arrangment of divergent

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VARIOLITIC

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Rocks with numerous holes occurpied by gas phase

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Vesicular

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CAVITY: a round ovoid elongate irrecular holes formed by explansion of gas

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Vesicular

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crystals in a glassy groundmass

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Vitric

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One or more concentric bands in a single crystals are picked out by lines of inclusions or by gradual or abrupt changes in solid solution

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ZONING

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Quartz grain resembles cuneiform writing

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