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Powellite

Year of discovery: 1891 (Peacock mine, USA), 1957 (Japan)

Locality list: 14 localities of powellite

• CaMoO₄
• [Ca²⁺][MoO₄]^2-

• Class: Scheelite group
• Class: Molybdate
• Soluble in: HCl (Decompose), HNO₃ (Decompose)
• Fluorescence: UV excitation (Yellow)
• Alter to Ferrimolybdite.
• Substitution pseudomorph: Replace Molybdenite.

• Ca => (BiO)₂: Koechlinite
• Ca => Pb: Wulfenite

• MoO₄ => WO₄: Scheelite (Series)

• Color: Yellow, Yellowish brown, Greenish yellow
• Streak: Pale yellow
• Luster: Adamantine
• Diaphaneity: Transparent-Translucent

• Cleavage: Indistinct on {112}, {011}, and {001} (7 planes)
• Hardness: 3.5-4
• Density: 4.3

• System: Tetragonal
• Group: 4/m, I4₁/a
• Lattice: a=5.2, c=11.4

Etymology: J. W. Powell (1834-1902), American geologist