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Strontiojoaquinite

Year of discovery: 1982 (Mina Numero Uno, USA), 2004 (Japan)

Locality list: A locality of strontiojoaquinite

• Sr₂Ba₂NaFeTi₂Si₈O₂₅(OH),H₂O
• Sr₂Ba₂(Na,Fe)₂Ti₂Si₈O₂₄(O,OH)₂,H₂O
• [Sr²⁺₂][Ba²⁺₂][Na⁺Fe²⁺][Ti⁴⁺₂][OH|O|(Si₄O₁₂)₂]^19-,H₂O

• Class: Joaquinite group
• Class: Cyclosilicate (Single ring) - Oxide - Hydroxide - Hydrate

• Polymorph: Strontio-orthojoaquinite (Orthorhombic)

• Sr => Ba: Bario-orthojoaquinite

• Sr₂ => Ce₂O: Joaquinite-(Ce), Orthojoaquinite-(Ce)
• Sr₂ => La₂O: Orthojoaquinite-(La)

• Color: Green, Yellow, Yellowish brown
• Luster: Vitreous
• Diaphaneity: Transparent

• Cleavage: Good on {001} (1 plane)
• Hardness: 5.5
• Density: 3.7

• System: Monoclinic (1M), Orthorhombic (2O, 4O) (Layer-stacking polytype)
• Group: 2, C2
• Lattice: a=10.5, b=9.8, c=11.9, β=109.3