Mineral 1.0: G

Mineral 1.0

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SulfideGalena

PbS

Most distinguishing features:
Gives off a rotten-egg smell in HCl, very high SG, very metallic lustre.
Industrial/economical uses:
Main ore from which lead is extracted, also a source of silver.

SilicateGarnet

(Mg,Fe,Ca)₃Al₂(SiO₄)₃
Other names/forms:
Pyrope, Grossular, Almandine

Most distinguishing features:
Crystal habit, colour and hardness.
Industrial/economical uses:
Abrasives (particularly sandpaper), semi-precious gemstone.

Native elementGraphite

C

Most distinguishing features:
Softness and lustre are best indicators.
Industrial/economical uses:
Used in pencil leads and as a dry lubricant.