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Carbonate

Brenkite

Ca₂(CO₃)F₂
Hardness5
Crystal systemOrthorhombic
ClassCarbonate
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Brenkite specimen

Brenkite Locality: Schellkopf Mt., Brenk, Niederzissen, Eifel Mts, Rhineland-Palatinate, Germany Aggregate of colourless Brenkite crystals. Field of view 6 mm. Specimen and photo Leon Hupperichs. — Photo: Leon Hupperichs · CC BY-SA 3.0

Brenkite

Brenkite is an IMA-recognized mineral species in the carbonate class, with the chemical formula Ca₂(CO₃)F₂.

It crystallizes in the orthorhombic crystal system (space group Pbcn).

Key properties: Mohs hardness 5; specific gravity 3.1; White streak; optically biaxial.

IMA symbol Bki, IMA status: approved, named in 1977.

Found in voids and fissures in a porphryritic selbergite [formerly nosean-phonolite].

It is found associated with Phillipsite, zeophyllite, gismondine, calcite.

The name refers to Brenk, near the locality in Germany.

Index entry. This entry combines official IMA/RRUFF species data with published physical-property data — a full written entry hasn’t been published yet. Browse more B minerals or help write this entry.