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Stokesite

Year of discovery: 1899 (Stamps and Jowl Zawn (Roscommon cliff), UK), 1977 (Japan)

Locality list: 2 localities of stokesite

• CaSnSi₃O₉,2H₂O
• [Ca²⁺][Sn⁴⁺][(SiO₃)₃]^6-,2H₂O

• Class: Inosilicate (Single chain) - Hydrate

• Color: Colorless, White, Pale blue
• Streak: White
• Luster: Vitreous
• Diaphaneity: Transparent-Translucent

• Cleavage: Perfect on {101} (2 planes), Imperfect on {100} (1 plane)
• Hardness: 6
• Density: 3.2

• System: Orthorhombic
• Group: mmm, Pnna
• Lattice: a=14.5, b=11.6, c=5.2