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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 :
Ca₂Sn₂[Si₆O₁₈] * 4 H₂O
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.