Ferroqingheiite

ferroqingheiite

jahnsite

frondelite

cyrilovite

Images

Formula: NaNaFe²⁺(MgAl)(PO₄)₃
Anhydrous phosphate, wyllieite group, alluaudite supergroup
Crystal System: Monoclinic
Specific gravity: 3.6 measured, 3.54 calculated
Hardness: 4
Streak: Pale to bottle green
Colour: Dark green
Luminescence: Not fluorescent under UV
Environments

Pegmatites

Localities

At the type locality, the Sebastião Cristino claim, Linópolis, Divino das Laranjeiras, Minas Gerais, Brazil, ferroqingheiite occurs as rims around frondelite grains, included in a matrix of quartz and albite. Frondelite is locally replaced by jahnsite, cyrilovite and iron-manganese oxides. The geological setting is a granite pegmatite (EJM 22.3.459-467).

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