Picromerite
Mineral from the class of hydrous sulfates / From Wikipedia, the free encyclopedia
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Picromerite (synonyms: schoenite, schönite) is a mineral from the class of hydrous sulfates lacking additional anions, and containing medium to large cations according to the Nickel–Strunz classification.[3]
Quick Facts General, Category ...
Picromerite | |
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General | |
Category | Sulfate mineral |
Formula (repeating unit) | K2Mg(SO4)2·6H2O |
IMA symbol | Pmr[1] |
Strunz classification | 7.CC.60 |
Dana classification | 29.03.06.01 |
Crystal system | Monoclinic |
Crystal class | Prismatic (2/m) (same H-M symbol) |
Space group | P21/a |
Unit cell | a = 9.07, b = 12.21, c = 6.11 [Å]; β = 104,8°; Z = 2 |
Identification | |
Color | Colorless; white, grey, reddish, yellowish |
Crystal habit | massive aggregates; crusts; prismatic crystals |
Cleavage | perfect {201}[2] |
Mohs scale hardness | 2.5 |
Luster | Vitreous |
Streak | White |
Diaphaneity | Transparent |
Density | 2.03[2] |
Optical properties | Biaxial (+) |
Refractive index | nα = 1.461 nβ = 1.463 nγ = 1.476[3] |
Birefringence | δ = 0.015[3] |
2V angle | Measured: 47°[3] |
Solubility | in cold water |
Taste | bitter |
References | [3][2][4] |
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