Curite

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Curite
Curite.jpg
Curite
General
CategoryOxide mineral
Formula
(repeating unit)
Pb3(UO2)8O8(OH)6·3(H2O)
Strunz classification4.GB.55
Crystal systemOrthorhombic
Crystal classDipyramidal (mmm)
H-M symbol: (2/m 2/m 2/m)
Space groupPnam
Unit cella = 12.551 Å, b = 7.008 Å,
c = 6.983 Å; Z = 2
Identification
ColorYellow, reddish orange, brownish yellow.
Crystal habitMassive, acicular, compact earthy.
Cleavage{100}, imperfect
TenacityBrittle
Mohs scale hardness4-5
LusterAdamantine
StreakOrange
DiaphaneityTransparent
Specific gravity6.98 - 7.4
Optical propertiesBiaxial (-)
Refractive indexnα = 2.060 nβ = 2.110 nγ = 2.150
Birefringence.090
PleochroismVisible: X = b = pale yellow, Y = a = light red-orange, Z = c = dark red-orange
2V angle70°
Ultraviolet fluorescenceYes
Other characteristicsRadioactive
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]