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Tyuyamunite

Year of discovery: 1912 (Tyuya-Muyun deposit, Kyrgyzstan), 1959 (Japan)

Locality list: 2 localities of tyuyamunite

• Ca(UO₂)₂(VO₄)₂,5-8H₂O
• [Ca²⁺][(UO₂)²⁺₂][(VO₄)₂]^6-,5-8H₂O

• Class: Uranyl - Vanadate - Hydrate - Zeolitic water
• Soluble in: HCl, HNO₃, H₂SO₄
• Insoluble in: Acetic acid
• Fluorescence: UV excitation (Yellowish green, Some examples)
• Lightfastness: Turn yellowish green by Light exposure
• Radioactive: Very strong
• Dehydrate to Metatyuyamunite under dry condition.

• Ca => K₂: Carnotite

• Color: Yellow
• Tarnish: Yellowish green (by light exposure)
• Streak: Pale yellow
• Luster: Adamantine
• Diaphaneity: Translucent-Opaque

• Cleavage: Perfect on {001} (1 plane), Distinct on {100} and {010} (2 planes)
• Hardness: 1.5-2
• Density: 3.8

• System: Orthorhombic
• Group: mmm, Pnan
• Lattice: a=10.6, b=28.4, c=20.4