Commonly as tabular equant, to short prismatic crystals; rarely in microcrystalline aggregates
Cleavage
[001] Perfect, [010] indistinct
Tenacity
Brittle
Mohs scale hardness
2.5
Luster
Adamantine
Streak
Yellow
Diaphaneity
Transparent to translucent
Specific gravity
4.8
Optical properties
Biaxial (−)
Refractive index
nα = 1.690 nβ = 1.714 nγ = 1.735
Birefringence
δ = 0.045
Pleochroism
X = almost colorless; Y = Z = lemon-yellow to golden yellow
2V angle
Measured: 89°
Ultraviolet fluorescence
Short and long UV = pale green
Other characteristics
Radioactive
References
[2][3][4]
Schoepite, empirical formula (UO2)8O2(OH)12·12(H2O)[2] is a rare alteration product of uraninite in hydrothermal uranium deposits. It may also form directly from ianthinite. The mineral presents as a transparent to translucent yellow, lemon yellow, brownish yellow, or amber orthorhombic tabular crystals. Although over 20 other crystal forms have been noted; rarely in microcrystalline aggregates. When exposed to air schoepite converts over a short time to the metaschoepite form (UO3·nH2O, n < 2) within a few months of being exposed to ambient air.
The hardness is 2.5, density is 4.8 g/cm3, and it streaks yellow.
It was first described from specimens from Shinkolobwe mine in Belgian Congo in 1923,[2] several additional localities are known.
Schoepite was named to honor Alfred Schoep (1881–1966), Professor of Mineralogy at the University of Ghent, Belgium.[3]
Schoepite, empirical formula (UO2)8O2(OH)12·12(H2O) is a rare alteration product of uraninite in hydrothermal uranium deposits. It may also form directly...
common. New minerals identified here include ianthinite, becquerelite, schoepite, curite, fourmarierite, masuyite, vandendriesscheite, richetite, billietite...
Paulscherrerite, UO2(OH)2, is a newly named mineral of the schoepite subgroup of hexavalent uranium hydrate/hydroxides. It is monoclinic, but no space...
U(IV) is one of the constituents of the mineral), it gets a layer of schoepite/ metaschoepite in the presence of oxygen. Polyoxometalates: Menezesite...
forms uranium dioxide, uranium trioxide, and coffinite. In pure water, schoepite (UO2)8O2(OH)12·12(H2O) is formed in the first week and then after four...
oxidation zone along with dewindtite, fourmarierite, kasolite, rutherfordine, schoepite, soddyite, sklodowskite, torbernite und vandendriesscheite. Curit has...
is associated with metazellerite, gypsum, uranophane, meta-autunite, schoepite, iron sulfides, limonite and opal. Warr, L.N. (2021). "IMA–CNMNC approved...
Shcherbina (1907–1978) Scheuchzerite (9.DM.35) Schoenfliesite (4.FC.10) Schoepite: (UO2)8O(OH)12·12H2O – Alfred Schoep (1881–1966), professor of mineralogy...
Global Information
Radioactive