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GraphiteC

Class: Native element
Hardness: 1 - 2
Density: 2.1 - 2.3
Streak: Black
Lustre: Dull metallic, greasy feel
Habit: Fine grained aggregate
Colours: Silver-black

  Crystal System: Hexagonal
Cleavage: Perfect basal
Fracture: Uneven
Magnetism: None
Reaction with HCl: None

Identification in hand sample:
Softness and lustre are best indicators.

Associations:
Common in pelitic metamorphic rocks such as phyllite, slate and schist. Produced as a result of decomposition of organic material.

Industrial / ecomonic uses:
Used in pencil leads and as a dry lubricant.

Comments:
Due to its softness, graphite is usually quite messy!

  

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