Eas 210 Lab Midterm Description

Front 1

Galena

Back 1

Cleavage - 3 excellent
Hardness- 2.5
Color - silver-grey
Other - none

Front 2

Pyrrhotite

Back 2

Cleavage - none
Hardness- 3.5-4.5
Color - bronze
Other - magnetic

Front 3

Magnetite

Back 3

Cleavage - none
Hardness- 6
Color - dark gray to black
Other - dull lustre, attracted to magnet

Front 4

Pyrite

Back 4

Cleavage - none
Hardness- 6-6.5
Color - brass yellow
Other - cubic habit

Front 5

Hematite

Back 5

Cleavage - none
Hardness- 6
Color - steel gray to dull red
Other - massive or tiny flakes

Front 6

Sulfur

Back 6

Cleavage - none
Hardness- 1.5-2.5
Color - yellow
Other - resinous lustre

Front 7

Sphalerite

Back 7

Cleavage - 6
Hardness- 3.5-4
Color - brown to yellow, or black
Other - resinous lustre

Front 8

Hematite

Back 8

Cleavage - none
Hardness- 1.5-5.5
Color - red to reddish brown
Other - dull lustre, earthy

Front 9

Talc

Back 9

Cleavage - 1
Hardness- 1-2
Color - white, gray
Other - soapy feel

Front 10

Muscovite

Back 10

Cleavage - 1
Hardness- 2-3
Color - colorless to light brown
Other - colorless and flexible in thin sheets

Front 11

Biotite

Back 11

Cleavage - 1 perfect
Hardness- 2.5-3
Color - black to brownish-black
Other - vitreous lustre

Front 12

Halite

Back 12

Cleavage - 3 excellent at 90
Hardness- 2-2.5
Color - colorless to white
Other - perfect cleavage

Front 13

Sylvite

Back 13

Cleavage - 3 excellent at 90
Hardness- 2.5
Color - colorless, white, gray, reddish
Other - bitter taste

Front 14

Calcite

Back 14

Cleavage - 3 excellent
Hardness- 3
Color - colorless, white
Other - effervesces in HCL

Front 15

Dolomite

Back 15

Cleavage - 3 excellent
Hardness- 3.5-4
Color - white
Other - reacts slowly with HCL

Front 16

Gypsum

Back 16

Cleavage - 3
Hardness- 2
Color - white or transparent
Other - none

Front 17

Fluorite

Back 17

Cleavage - 4
Hardness- 4
Color - colorless, yellow, green or Violet
Other - good cleavage, vitreous

Front 18

Olivine

Back 18

Cleavage - none
Hardness- 6.5-7.5
Color - olive green
Other - vitreous to dull lustre

Front 19

Garnet

Back 19

Cleavage - none
Hardness- 7-7.5
Color - red-gurgundy, brown
Other - vitreous lustre

Front 20

Staurolite

Back 20

Cleavage - none
Hardness- 7+
Color - red-brown
Other - vitreous to dull lustre, hexagonal cross section

Front 21

Plagioclase

Back 21

Cleavage - 2 excellent
Hardness- 6
Color - gray to blue-gray
Other - none

Front 22

Pyroxene

Back 22

Cleavage - 2 excellent
Hardness- 6
Color - dark green to black
Other - none

Front 23

Amphibole

Back 23

Cleavage - 2 at about 60 and 120
Hardness- 6
Color - black
Other - none

Front 24

Quartz

Back 24

Cleavage - none
Hardness- 7+
Color - colorless, white, smoky

Front 25

Kyanite

Back 25

Cleavage - 1
Hardness- 4-7
Color - light blue to greenish blue
Other - vitreous lustre,

Front 26

Plagioclase

Back 26

Cleavage - 2
Hardness- 6
Color - white to dark gray
Other - 2 good at 90, vitreous lustre