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Formula: Ca2Mn2+5Be4(PO4)6(OH)4.6H2O
Hydrated phosphate, roscherite group,
manganese- and
beryllium- bearing mineral
Crystal System: Monoclinic
Specific gravity: 2.90 to 2.97 measured, 2.77 calculated
Hardness: 4½
Streak: White
Colour: Brown, red, orange, greenish gray; yellowish green to brown in transmitted light; May exhibit abnormal interference colours
(Mindat).
Solubility: Soluble in acids
Environments
Plutonic igneous environments
Pegmatites
Roscherite occurs in cavities in granite or in
granitic pegmatites (Mindat, HOM), associated with
albite, beryl,
beryllonite, fluorapatite,
hydroxylherderite, moraesite,
muscovite and quartz
(Mindat).
At the Sapucaia pegmatite mine, Brazil, roscherite occurs in vugs in muscovite, associated with
faheyite, variscite,
frondelite, beryl,
muscovite and quartz
(AM 43.824-838, HOM).
At the type locality, the Greifenstein Rocks, Ehrenfriedersdorf, Erzgebirgskreis, Saxony, Germany, roscherite occurs in drusy
cavities in
granite associated with
lacroixite, childrenite,
apatite, morinite,
eosphorite, apatite and
tourmaline
(Dana, Mindat, HOM).
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