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19 Cards in this Set
- Front
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- sphalerite ZnS - sulphide - shows good cleavage (6 directions) - yellow, brown, black - streak pale yellow, brown - resinous - Scratched by nail (3.5-4) - may be metallic - gravity (3.9-4.1) |
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- biotite KFeMgAl silicate - silicate - Shows Cleavage (1 plane) - grey to black - transparent thin sheets - white streak - micaeous - elastic in tenacity - softer then a nail (2.5-3) |
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- quartz SiO2 - silicate - conchoidal or irregualr fracture - colourlous when pure but can be a wide range of colour ( grey, black, pink etc) - massive or granular - hexagonal prisms (sometimes pyramidal) - viteous (can be greasy) - harder than a nail (7) - horizontal striations
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- garnet CaFeAl silicate - silicate - Red, brown, brown red, pale green - fractures sometimes resemble poor cleavage - rhombic dodecahedron crystals - massive - gravity 3.5-4.3 - harder than a nail |
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- hematite Fe2O3 - oxide - red, brown, black, steel grey - metallic, submetallic - granular, micaious, oolitic - gravity 7.5 - red to brown streak if not metallic - earthy - may be weakly magnetic - harder than a nail (5.5-6) |
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- pyroxene CaFeMgAl silicate - silicate - green, gray green, black - shows cleavage (2 planes @ 90) - harder then a nail (6) - prismatic crstls that have square or 8 sided cross sections
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- amphibole CaNaFeMgAl silicate - silicate - shows cleavage (2 planes @ 60 or 120) - darm green, black - prismatic crystals have flattened diamond or hexagonal shaped cross sections - harder then a nail (6) |
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- plagioclase CaNaAl silicate - silicate - blue, blue-grey, milky white - shows cleavage (2 planes @ 90) - harder then a nail (6) - tabular, prismatic crystals - may be iridescnet (pearly) - striations may occur on cleavage planes
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- k-feldspar KAl silicate -silicate - shows cleavge (2 planes @ 90) - harder then a nail (6) - pink, light gray, milky white - prismatic or tabular crystals - some varieties with sufficient sodium develop perthitic veining - vitreous |
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- olivine MgFe silicate - silicate - harder than a nail (6.5-7) - various shades of green - stubby prismatic crystals - granular - viterous |
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- calcite CaCo3 - carbonate - softer then a nail (3) - shows cleavage - white, colourless (tinted colour in light) - rhombic - granular - effervesces in cold dilute HCI - viterous, pearly |
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- Halite NaCl - halide - softer than a nail (2.5) - colourless, white (impure varieties various shades) - shows cleavage - cubic - granular - salty taste - viterous
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- muscovite KAl silicate - silicate - softer than a nail (2-2.5) - shows cleavage (1 plane) - colourless transperant sheets - white streak - elastic tenacity - vitreous, silky, pearly |
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- gypsum CaSO4 • 2(H2O) - sulphate - softer than a nail (2) - shows cleavage (1 plane) - white to colourless - massive, granular, fibrous, rosettes, tabular, platy -tabular / platy (can be transperant) - pearly, silky, vitreous, dull |
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- talc hydrous Mg silicate - silicate - softer than a nail (1) - shows cleavage (1) - green, white , grey - flaky aggregate, fine grained, individual sheets - massive - pearly, greasy - tenacity is flexible in flakes and sheets - soapy feel |
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- pyrite FeS2 - sulphide - metalic - submetallic - hardness (6-6.5) - pale brass yellow or daker resulting from tarnish - greenish or brownish black streak - cubic crystals - granular - brittle may be striated - gravity (5) |
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- magnetite Fe3O4 - oxides - Metallic - submetallic - Hardness (6) - black - black streak - granular - strong magnetic susceptibility - gravity (5.2)
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- chalcopyrite CaFeS2 - sulphide - Metallic - Hardness (3.5-4) - brass yellow - tarnishes bronze or iridescent - greenish black streak - massive - gravity (4.2) |
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- galena PbS - sulphides - Metallic - hardness (2.5) - shiny grey - grey black streak - cubic - fine grained granular - gravity (7.5) |
