Magnesiobermanite

magnesiobermanite

mitridatite

perloffite

ushkovite

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Formula: MgMn3+2(PO4)2(OH)2.4H2O
Hydrated phosphate, manganese-bearing mineral
Crystal system: Monoclinic
Specific gravity: 2.75 measured, 2.73 calculated
Hardness: 3½
Streak: Salmon-pink
Colour: Orange-red to brownish red
Luminescence: No fluorescence under UV
Environments

Pegmatites

Magnesiobermanite is a relatively new mineral, approved in 2018 when it was found on a specimen collected from the White Rock No.2 quarry in the 1960s. To date (July 2025) it has not been reported from any other locality.

Localities

At the type locality, the White Rock No. 2 pegmatite, White Rock Feldspar Mine, Old Boolcoomata Station, Bimbowrie Conservation Park, Pastoral Unincorporated Area, South Australia, magnesiobermanite was found in the granitic pegmatite as twinned, bladed to tabular crystals, up to 0.3 mm long, forming aggregates up to 1.2 mm across. Magnesiobermanite occurs in cavities in a matrix comprising quartz and hydrothermally altered dark brown to black dufrénite group minerals (dufrénite, natrodufrénite, gayite and bimbowrieite) that have nearly completely replaced earlier triplite. Associated minerals include fluorapatite, jahnsite-(NaFeMg), laueite, leucophosphite, mitridatite, perloffite and ushkovite (Mindat).

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