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Curite | |
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General | |
Category | Oxide mineral |
Formula (repeating unit) | Pb3[(UO2)4|O4|(OH)3]2·2 H2O[1] |
IMA symbol | Cui[2] |
Strunz classification | 4.GB.55 |
Crystal system | Orthorhombic |
Crystal class | orthorhombic-dipyramidal; 2/m 2/m 2/m[3] |
Space group | Pnam[4] |
Unit cell | a = 12.551 Å, b = 13.02 Å, c = 8.40 Å; Z = 2 |
Identification | |
Color | red, reddish orange, brownish yellow. |
Crystal habit | needles, acicular, massive, compact earthy. |
Cleavage | {100}, imperfect}[5] |
Fracture | uneven |
Tenacity | brittle |
Mohs scale hardness | 4-5 |
Luster | adamantine |
Streak | orange |
Diaphaneity | transparent |
Density | measured: 6.98–7.4; calculated: 7,37[5] |
Optical properties | biaxial (-) |
Refractive index | nα = 2.060 nβ = 2.110 nγ = 2.150[6] |
Birefringence | 0.090 |
Pleochroism | Visible: X = b = pale yellow, Y = a = light red-orange, Z = c = dark red-orange |
2V angle | 70° (measured); 80° (calculated)[6] |
Other characteristics | Radioactive |
Curite is a rare mineral with the chemical composition Pb3[(UO2)4|O4|(OH)3]2·2 H2O.[1] It is therefore a hydrated lead uranyl oxide, which forms red needles or orange, massive aggregates.
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