Hydrated phosphate with hydroxyl, roscherite group
Specific gravity: 2.93
Colour: Dark olive green
Greifensteinite is a rare secondary mineral in miarolitic cavities in
lithium-rich granite pegmatites
(Webmin). Associated minerals include
monohydrocalcite and calcite
At the type locality, the Greifenstein Rocks, Ehrenfriedersdorf, Erzgebirgskreis, Saxony, Germany, greifensteinite occurs in a lithium-rich granite pegmatite, associated with albite, K-feldspar, roscherite, viitaniemiite, childrenite, quartz, apatite, herderite, elbaite and montmorillonite (Minrec 35.4.351).
At the the Chickering Mine, Walpole, Cheshire County, New Hampshire, USA, greifensteinite typically forms crystal clusters to 2 mm across in the vugs of siderite and quartz, associated with beraunite, strunzite and childrenite. Sprays of lathlike crystals to 0.5 mm have been identified in the hydrothermally altered triphylite assemblage, where they are associated with whitmoreite, ludlamite and paravauxite (R&M 90.5.417-418).
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