Graphite

The crystals form as flattened, tabular, hexagonal plates. Graphite also occurs in massive, foliated, granular, and earthy habits. It is dark gray to black and has a dark gray or black streak. This is an opaque mineral. Its luster is dull metallic.

FORMATION Forms in metamorphic rocks, including slate and schist.

TESTS Feels greasy. If rubbed on paper, a gray mark is left.

Group: NATIVE ELEMENTS

Composition: C

Hardness: 1–2

SG: 2.09–2.23

Cleavage: Perfect basal

Fracture: Uneven

Silver

What mineral is this?

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