Tin

minerals

cassiterite

franckeite

jeanbandyite

Formula: Sn
Native element
Specific gravity: 7.31
Hardness: 1½ to 2
Streak: Grey-white
Colour: Tin-white
Solubility: Dissolves in acids and bases.
Abundance: Earth’s crust: 2.3 parts per million by weight, 0.4 parts per million by moles. Solar system: 9 parts per billion by weight, 0.1 parts per billion by moles (ChC)
Melting point: 231.928oC
Boiling point: 2620oC
Environments

Placer deposits rarely

Native tin occurs rarely as greyish metallic grains and nuggets to 1 cm in some placers, kimberlite pipes or seafloor spreading zones (Mindat, HOM).
In compounds tin is usually divalent, Sn2+ or tetravalent Sn4+ (ChC).
Associated minerals include platinum, gold, copper, sorosite and cassiterite (HOM).

Localities

At Oued Berkou, Algeria, native tin occurs in greisen (Dana).

At Oban, Australia, native tin occurs in placer sands (Dana, Webmin).

At Beaverlodge, Canada, native tin occurs in calcite as discrete grains (Webmin).

Tin-bearing minerals include:

Sulphides
herzenbergite
mawsonite

Sulphosalts
cylindrite
franckeite

Oxides
cassiterite
jeanbandyite
wodginite

Hydroxides
natanite
tetrawickmanite
wickmanite

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