WJEC Geology GL2 Minerals
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- Created by: Samantha
- Created on: 07-10-15 19:16
Quartz
- Colour - translucent/clear
- Lustre - vitreous
- Cleavage - poor
- Hardness - 7 - harder than fingernail, coin and steel pin
- Streak - white/scratches plate
1 of 20
Calcite
- Colour - white
- Lustre - vitreous
- Cleavage - perfect in three directions
- Hardness - 3 - harder than a fingernail and a copper coin.
- Streak - white
- Effervescences with hydrochloric acid
2 of 20
Plagioclase feldspar
- Colour - white
- Lustre - vitreous
- Cleavage - good in two directions
- Hardness - 6 - harder than a fingernail, copper coin and a steel pin
- Streak - scratches plate
3 of 20
Orthoclase feldspar
- Colour - flesh pink
- Lustre - vitreous
- Cleavage - good in two directions
- Hardness - 6 - harder than a fingernail, copper coin and steel pin
- Streak - white
4 of 20
Augite
- Colour - greenish black
- Lustre - vitreous
- Cleavage - good in two directions
- Hardness - 5 to 6 - harder than fingernail, copper coin and steel pin
- Streak - scratches plate
5 of 20
Hornblende
- Colour - dark green/black
- Lustre - vitreous
- Cleavage - good in two directions
- Hardness - 5 to 6 - harder than a fingernail, copper coin and a steel pin
- Streak - scratches plate
6 of 20
Olivine
- Colour - olive green
- Lustre - vitreous
- Cleavage - none
- Hardness - 6 to 7 - harder than a fingernail, coin and steel pin
- Streak - scratches plate
7 of 20
Biotite mica
- Colour - brown/black
- Lustre - vitreous/pearly
- Cleavage - perfect in one direction forming thin sheets
- Hardness - 2.5 - not harder than any of them
- Streak - white
8 of 20
Muscovite mica
- Colour - white
- Lustre - pearly
- Cleavage - perfect in one direction creating thin sheets
- Hardness - 2 to 2.5 - not harder than any of them
- Streak - white
9 of 20
Haematite
- Colour - red/black
- Lustre - metallic
- Cleavage - poor
- Hardness - 5.5 to 6.5 - harder than fingernail, copper coin and steel pin
- Streak - cherry red
10 of 20
Galena
- Colour - dark grey
- Lustre - metallic
- Cleavage - good in three directions
- Hardness - 2.5 - harder than a fingernail
- Streak - dark grey
11 of 20
Pyrite
- Colour - brass yellow
- Lustre - metallic
- Cleavage - none
- Hardness - 6 - harder than a fingernail, copper coin and steel pin
- Streak - greenish black
12 of 20
Chalcopyrite
- Colour - brown yellow
- Lustre - metallic
- Cleavage - poor
- Hardness - 3.5 to 4 - harder than a fingernail and copper coin
- Streak - black
13 of 20
Fluorite
- Colour - colourless/purple/green/yellow
- Lustre - vitreous
- Cleavage - good in four directions
- Hardness - 4 - harer than a fingernail and a copper coin
- Streak - white
14 of 20
Barite
- Colour - white/pink
- Lustre - vitreous
- Cleavage - good in two directions
- Hardness - 3 to 3.5 - harder than a fingernail and copper coin
- Streak - white
15 of 20
Halite
- Colour - clear/white
- Lustre - vitreous
- Cleavage - good in three directions
- Hardness - 2.5 - not harder than anything
- Streak - white
- Notable feature - salty taste (also known as rock salt)
16 of 20
Gypsum
- Colour - colourless/white
- Lustre - silky/pearly
- Cleavage - good in one direction
- Hardness - 2 - not harder than anything
- Streak - white
- Notable feature - fibrous
17 of 20
Andalusite
- Colour - grey/pink
- Lustre - vitreous
- Cleavage - poor in one direction
- Hardness - 7.5 - harder than a fingernail, copper coin and a steel pin
- Streak - scratches plate
18 of 20
Garnet
- Colour - red/brown
- Lustre - vitreous
- Cleavage - none
- Hardness - 6.5 to 7.5 - harder than a fingernail, copper coin and a steel pin
- Streak - scratches plate
19 of 20
Chlorite
- Colour - green
- Lustre - pearly
- Cleavage - good in one direction
- Hardness - 2 - not harder than anything
- Streak - white
20 of 20
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