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Strontio-orthojoaquinite (Photo)

Year of discovery: 1974 (Japan as the first occurence in the World)

Locality list: A locality of strontioorthojoaquinite

• 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: Strontiojoaquinite (Monoclinic)

• Sr => Ba: Bario-orthojoaquinite

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

• Color: Yellow, Green
• Streak: White
• Luster: Vitreous
• Diaphaneity: Translucent

• Habit: Short prismatic

• Cleavage: Good on {001} (1 plane)
• Hardness: 5.5
• Density: 3.6

• System: Orthorhombic
• Group: mmm, Pbc2
• Lattice: a=10.5, b=9.8, c=22.4