a = 7.3065(5) Å, c = 16.897(2) Å; V = 781.2 ų; Z = 3
Identification
Formula mass
667.82 g/mol
Color
Brown to light yellowish brown, pale yellow, yellowish green to dark green
Crystal habit
Crystals pseudocubic rhombohedral with prominent {1011}. Commonly in crusts and massive
Cleavage
Perfect on {0001}
Mohs scale hardness
3.5–4.5
Luster
Vitreous, resinous
Diaphaneity
transparent
Specific gravity
4.295 (measured), 4.31 (calculated)
Optical properties
Uniaxial (−), may appear anomalously biaxial
Refractive index
nω = 1.930 nε = 1.930 n = 1.93 – 1.96
Birefringence
δ = 0.000
Other characteristics
Readily soluble in warm HCl
References
[2][3][4][5][6]
Corkite is a phosphate mineral in the beudantite subgroup of the alunite group. Corkite is the phosphate analogue of beudantite and with it, a complete solid solution range exists. Corkite will also form a solid solution with kintoreite.
Corkite is named after County Cork, Ireland; the location where the first notable amount was discovered in 1869.[3] Like many of the other minerals in the beudantite group, corkite is a relatively uncommon, secondary mineral that occurs in oxidation zones near hydrothermal base metal deposits.[3] It occurs associated with pyromorphite, malachite, plumbojarosite, limonite and quartz.[6]
Corkite is a phosphate mineral in the beudantite subgroup of the alunite group. Corkite is the phosphate analogue of beudantite and with it, a complete...
after this forest name (it is not clear which; it may be beudantite or corkite). More recently, it has been suggested that it is the Černý les ('black...
jarosite group on top, having the highest content of sulfur. The beudantite-corkite group lies in the middle third on the ternary diagram, possessing intermediate...
associated with duftite, bayldonite, hidalgoite, pharmacosiderite, segnitite, corkite-beudantite, adamite-olivenite, and other iron-manganese oxides. At the...
blue to bluish green crystals. It usually occurs with yellow crusts of corkite-hinsdalite, colorless to white pyromorphite needles and sprays of pale...
subgroup of the alunite group. It is the arsenate analogue of the phosphate corkite. Beudantite also forms a solid-solution with segnitite and plumbojarosite...