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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
briartite
catamarcaite
germanite
putzite
radvaniceite
renierite
ruizhongite
stangersite
zincobriartite
Germanides
marathonite
palladogermanide
Oxides
argutite
otjisumeite
pertoldite
Hydroxides
stottite
Phosphates
galloplumbogummite
Arsenates
karlseifertite
Sulphates
fleischerite
itoite
Germanates
bartelkeite
Nesosilicates
brunogeierite
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