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Stokesite - Urucum claim, Barra do Cuieté, Conselheiro Pena, Minas Gerais, Brazil
(#:MINS8960)
Globular growth, practically spherical, a floater, of platy crystals. The development of the crystals and their luster are excellent for this rare calcium and tin silicate.
Formula :
Ca
2
Sn
2
[Si
6
O
18
] * 4 H
2
O
System:
orthorhombic
Hardness:
6
Rarity:
very rare
Strunz id:VIII/F.29-30 - SILICATES
Name origin:
Named after Sir George Gabriel Stokes (1819-1903), mathematician and physicist, University of Cambridge (England), after whom is named Stokes law, describing the force acting on a particle moving in a fluid medium.
Specimen weight:10 gr.
Crystal size:Up to 4 mm
Overall size: 18mm x 16 mm x 10 mm
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