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Thorogummite

Year of discovery: 1889 (Baringer Hill, USA), 1904 (Japan)

Locality list: 33 localities of thorogummite

• Th(SiO₄,OH)
• (Th,U)(SiO₄,OH)
• [Th⁴⁺][(OH)_4x|(SiO₄)_1-x]^4-
• Questionable if this is an independent mineral species.

• Class: Nesosilicate
• Soluble in: HCl, HNO₃, H₂SO₄
• Radioactive: Very strong

• Th => U: Coffinite

• (OH)₄ => SiO₄: Thorite

• Color: Yellowish brown, Yellowish green, Black
• Luster: Waxy
• Diaphaneity: Opaque

• Hardness: 5.5
• Density: 5.4

• System: Tetragonal
• Group: 4/mmm, I4₁/amd
• Lattice: a=7.1, c=6.3