Minerals

Question 1

K feldspar

Answer 1

H= 6
Salmon pink white
2 cleavages at 90

Question 2

Plagioclase

Answer 2

H=6
White to dark grey
2 cleavages at 90
Parallel striations

Question 3

Quartz

Answer 3

H=7
Conchoidal fracture
Vitreous lustre

Question 4

Muscovite

Answer 4

H=2
Colourless brownish silvery white
1 prefect cleavage
Flexible elastic sheets

Question 5

Hornblende amphibole

Answer 5

H=5
Black
2 perfect cleavage at 124 and 56
Splintery

Question 6

Biotite

Answer 6

H=3
Black brown
1prefect cleavage
Flexible elastic

Question 7

Augite pyroxene

Answer 7

H=5-6
Black dark green
Two imperfect cleavages at 90

Question 8

Olivine

Answer 8

H=6.5-7
Green yellow
Granular

Question 9

Gypsum

Answer 9

H=2
Clear white light grey
Vitreous to pearly

Question 10

Pyrite

Answer 10

H=6.5
Metallic
Brass yellow

Question 11

Calcite

Answer 11

H=3
Clear white
3 cleavage
Rhombic cleavage fragments
Reacts with HCI

Question 12

Dolomite

Answer 12

H=3
Reacts slowly or not at all with HCI
3 distinct cleavages

Question 13

Halite

Answer 13

H=2.5
Clear to gray to red
3 perfect cleavage at 90
Salty

Question 14

Phaneritic

Answer 14

Coarse grain more that 1mm

Question 15

Aphanitic

Answer 15

Fine grain less that 1mm

Question 16

Pegmatitic

Answer 16

Huge crystals more that 3cm

Question 17

Porphyritic

Answer 17

Two crystal sizes

Question 18

Phenocrysts

Answer 18

Larger crystals

Question 19

Ground mass

Answer 19

Smaller crystals surrounded by phenocrysts

Question 20

Vesicular

Answer 20

Bubbles

Question 21

Pyroclastic

Answer 21

Multiple fragments