Curite

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Curite
Curite.jpg
Curite
General
Category Oxide mineral
Formula
(repeating unit)
Pb3(UO2)8O8(OH)6·3(H2O)
Strunz classification 4.GB.55
Crystal system Orthorhombic
Crystal class Dipyramidal (mmm)
H-M symbol: (2/m 2/m 2/m)
Space group Pnam
Unit cell a = 12.551 Å, b = 7.008 Å,
c = 6.983 Å; Z = 2
Identification
Color Yellow, reddish orange, brownish yellow.
Crystal habit Massive, acicular, compact earthy.
Cleavage {100}, imperfect
Tenacity Brittle
Mohs scale hardness 4-5
Luster Adamantine
Streak Orange
Diaphaneity Transparent
Specific gravity 6.98 - 7.4
Optical properties Biaxial (-)
Refractive index nα = 2.060 nβ = 2.110 nγ = 2.150
Birefringence .090
Pleochroism Visible: X = b = pale yellow, Y = a = light red-orange, Z = c = dark red-orange
2V angle 70°
Ultraviolet fluorescence Yes
Other characteristics Radioactive
References [1][2]

Curite is a lead uranium oxide mineral with formula: Pb3(UO2)8O8(OH)6·3(H2O). It is named after the physicists Marie and Pierre Curie, who are both known for their work on radioactivity. The type locality is the Shinkolobwe Mine.[1]

References[edit]