Mineral

Hardness

Cleavage/Fracture

Colour/Streak

Lustre

Other

Orthoclase

6

2 @ 90°

typically pink

glassy

Plagioclase

6

2 @ 90°

white or grey

glassy

Quartz

7

fracture only

clear

very glassy

hexagonal crystals

Biotite mica

2-3

1 - perfect

black

glassy

Hornblende

6

2 @ 60/120°

black

needle-like

Halite

3

3 @ 90°

white

glassy

salty taste

Calcite

3

3 @ 70/110°

white

glassy

fizz in acid

Gypsum

2

1

white

glassy

Hematite

6

fracture only

red streak

can be metallic

Pyrite

6

fracture only

yellow

metallic

cubic crystals