Mineralogy Lab exam 1

Covellite

Color - Blue, purple or black

CuS

Goethite

Color - Yellow to Brown (sample Black)

FeO(Oh)

Cuprite

Color - red, red/brown

Cu2O

calcite

Color - clear, foggy, white

CaCO3

Rhodochrosite

Color - Pink

MnCO3

Amazonite

Color - white, Blue/green

KAISi3O8

Fluorite

Color - variable

CaF2

Hematite

streak - red/brown

color - red/black

pyrite

streak -black

color-gold

Garnet

crystal form - Euhedral crystals are 6 or 8 sided irregular Polygons

(fe, Mg, ca, mn)3(Al, Fe)2Si3O12

Halite

crystal form - cubic or isometric

NaCl

Galena

crystal forms - cubic

PbS

Orthoclase

crystal form - subbedral to ashedral

KAISi3O8

Kyanite

crystal form - Broad elongated tabs or narrow prises often bent

Al2SiO5

Biotite

crystal form - hexingonal Plates or tabs

K(Mg,Fe)3(AlSi3O10)(OH)2

Beryl

crystal form - hexagonal, prismatic

Be3Al2Si6O18

muscovite

crystal forms - tabular crystal flakes

Biotite Cleavage

1 cleavage set 180°

Orthoclase cleavage

3 cleavage sets 90°

calcite cleavage

3 cleavage sets 78° and 102°

galena cleavage

3 cleavage sets 90°

Quartz cleavage

fractures

Biotite hardness

3

Orthoclase hardness

6

calcite hardness

3

galena hardness

2.5

quartz hardness

7

Biotite acid reaction

none

orthoclare acid reaction

none

calcite acid reaction

reacts

galena acid reaction

none

quartz acid reaction

none

Dolomite acid reaction

solid - none

Powderd-reacts

Basalt form/habit

Often aphanitic, Porphyritic, or vesicular

No Cherical formula

quartz habit

druse, massive, or botryoidal forms or chalcedony

SiO2

Gypsum color

Variable

Gypsum hardness

2

Gypsum cleavage

Perfect basal

Gypsum luster

Pearly

Gypsum Diaphaneity

Transparent to translucent

Gypsum streak

White

Pyrophyllite form/habit

massive foliated

Pyrophyllite hardness

1 to 2

Pyrophyllite cleavage

Perfect basal

Pyrophyllite luster

Pearly

Pyrophyllite Diaphaneity

Translucent

Pyrophyllite color

White

Pyrophyllite streak

White

Olivine form/habit

Anhedral may have 6 sided Polygon outline

Olivine hardness

5.5 to 6.5

Olivine cleavage

Poor and conchoidal

Olivine luster

Vitreous

Olovine Diaphaneity

Transparent to translucent

Olivine color

colorless, green, grey, yellow

Olivine streak

White

aragonite form/habit

acicular, tabular, Prismatic or fibrous

CaCo3