Mineral Tray 3 Updated

Front 1

Back 1

Muscovite - Monoclinic

HN: 2.5

SG: 2.8

Clv: perfect

Lst: Glassy

Hint 1

A common rock-forming mineral, muscovite occurs in metamorphic rocks, such as gneisses and schists, and in granites, veins, and pegmatites. It is also found in some fine-grained sediments.

Front 2

Back 2

Glauconite - Monoclinic

HN: 2

SG: 2.5

Clv: perfect

Lst: Glassy

Hint 2

A widespread silicate, glauconite forms in shallow
marine environments, where it is used as a diagnostic mineral to identify continental-shelf deposits with slow rates of accumulation.

Front 3

Back 3

Biotite - Monoclinic

HN:2 - 3

SG: 3

Clv: perfect

Lst: Glassy

Hint 3

Biotite-series micas are widespread. They are a key
constituent of many igneous and metamorphic rocks,
including granites , nepheline syenites , gneisses, and schists

Front 4

Back 4

Lepidolite - Monoclinic

HN: 2.5 - 3.5

SG: 3

Clv: perfect

Lst: Glassy

Hint 4

Lepidolite occurs in granitic pegmatites, where it is associated with other lithium minerals, such as beryl and topaz

Front 5

Back 5

Chlorite - Monoclinic

HN: 2 - 3

SG:

Clv: perfect

Lst: Glassy

Front 6

Back 6

Kaolinite - Al2Si2O5(OH)4

Triclinic

HN: 2

SG: 2.6

Clv: perfect

Lst: earthy

Hint 6

Kaolinite is a natural product of the alteration of mica,
plagioclase, and sodium–potassium feldspars under the influence of water, dissolved carbon dioxide, and organic acids. It is used in agriculture; as a filler in food, such as chocolate

Front 7

Back 7

Talc - Mg3Si4O10(OH)2

Triclinic

HN: 1

SG: 2.8

Clv: perfect

Lst: earthy, greasy(soap feel)

Hint 7

Talc is a metamorphic mineral found in veins and
magnesium-rich rocks. It is often associated with serpentine, tremolite, and forsterite and occurs as an alteration product of silica-poor igneous rocks

Front 8

Back 8

Pyrophyllite

HN: 1 - 2

SG: 2.7 - 2.9

Clv: perfect

Lst: earthy dull

Hint 8

Pyrophyllite forms by the
metamorphism of aluminum-rich rocks, such as bauxite

Front 9

Back 9

Prehnite - Ca2Al2Si3O10(OH)2

Orthorhombic

HN: 6

SG: 2.9

Clv: perfect

Lst: Glassy

Hint 9

Prehnite is often found lining
cavities in volcanic rocks,
associated with calciteand zeolites, and in mineral veins in granite

Front 10

Back 10

Serpentine - Monoclinic

(Mg,Fe,Ni)3Si2O5(OH)4

HN: 3.5-5.5

SG: 2.5

Clv: perfect

Lst: Earthy, greasy

Hint 10

Serpentines are secondary
minerals derived from the chemical alteration of olivine , the pyroxenes, and the amphiboles. It is found in areas where highly altered, deep-seated, silica-poor rocks are exposed

Front 11

Back 11

Olivine - (Mg,Fe)2SiO4

Orthorhombic

HN: 7

SG: 4

Clv: imperfect

Lst: Glassy

Hint 11

Olivine specimens are usually
yellowish green, but they can
also be yellow, brown, gray, or
colorless

Front 12

Back 12

Garnet - A3B2Si3O12

Isometric

HN: 7

SG:

Clv: perfect

Lst: Glassy

Front 13

Back 13

Staurolite - Monoclinic

HN: 7

SG: 3.7

Clv: Distinct

Lst: Glassy

Hint 13

Staurolite occurs in mica
schists, gneisses , and
other metamorphosed, aluminum-rich rocks. It forms only under specific range of pressure and temperature

Front 14

Back 14

Andalusite - Al2SiO5

Orthorhombic

HN:7

SG: 3.2

Clv: perfect

Lst: Glassy

Hint 14

Andalusite is found in regional
and low-grade metamorphic
rocks, where it is associated
with corundum, cordierite
, sillimanite, and kyanite (p.238)

Front 15

Back 15

Kyanite - Al2SiO5

Triclinic

HN:6

SG: 3.6

Clv: perfect

Lst: Glassy

Hint 15

Kyanite is formed during the
regional metamorphism of clay-rich sediments. It occurs in mica schists, gneisses, and associated hydrothermal quartz veins and pegmatites

Front 16

Back 16

Sillimanite - Al2SiO5

Orthorhombic

HN:7

SG: 3.2

Clv: perfect

Lst: silky

Hint 16

Sillimanite is characteristic
of clay-rich metamorphic rocks
formed at hi temperatures 575°C or above

Front 17

Back 17

Topaz - Al2SiO4(F,OH)2

Orthorhombic

HN:8

SG: 3.5

Clv: perfect

Lst: Glassy

Hint 17

Topaz is formed by fluorine-bearing vapors released in the late stages of crystallization of igneous rocks

Front 18

Back 18

Dumortierite - (Al,Fe)7BSi3O18

Orthorhombic

HN: 7

SG: 3.4

Clv: perfect

Lst: Glassy

Front 19

Back 19

Zircon - ZrSiO4 - Tetra

HN: 7.5

SG: 4.7

Clv: perfect

Lst: Oily

Hint 19

Zircon is found in metamorphic
rocks and silica-rich igneous
rocks

Front 20

Back 20

Titanite/Sphene - CaTiSiO5

monoclinic

HN: 5

SG: 3.5

Clv: imperfect

Lst: Glassy

Hint 20

Titanite is widely distributed as
a minor component of silica-rich igneous rocks and associated pegmatites