Germanium

germanium

germanite

stottite

itoite

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Formula: Ge
Element, metalloid, does not occur on Earth in the native state
Specific gravity: 5.323
Hardness: 6
Colour: Grey-white
Melting point: 938oC
Boiling point: 2830oC
Abundance in the Earth’s crust: 1.5 parts per million by mass, 0.42 parts per million by moles
Abundance in the Solar System: 200 parts per billion by mass, 3 parts per billion by moles (ChC).
Occurrence: The main ore of germanium is germanite, which is about 7% germanium.

Germanium-bearing minerals include:

Sulphides
germanite
renierite

Hydroxides
stottite

Sulphates
fleischerite
itoite

Nesosilicates
brunogeierite

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