Greifensteinite

greifensteinite

roscherite

childrenite

ludlamite

Images

Formula: Ca2Be4Fe2+5(PO4)6(OH)4.6H2O
Hydrated phosphate with hydroxyl, roscherite group
Specific gravity: 2.93
Hardness: 4½
Streak: Green
Colour: Dark olive green
Environments:

Pegmatites

Greifensteinite is a rare secondary mineral in miarolitic cavities in lithium-rich granite pegmatites (Webmin). Associated minerals include schröckingerite, baylissite, monohydrocalcite and calcite (HOM).

Localities

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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