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Silicate

Chromo-alumino-povondraite

NaCr₃(Al₄Mg₂)(Si₆O₁₈)(BO₃)₃(OH)₃O
Hardness7.5
Crystal systemHexagonal
ClassSilicate
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Chromo-alumino-povondraite

Chromo-alumino-povondraite is an IMA-recognized mineral species in the silicate class, with the chemical formula NaCr₃(Al₄Mg₂)(Si₆O₁₈)(BO₃)₃(OH)₃O.

It crystallizes in the hexagonal crystal system (space group R3m). It is a member of the Tourmaline structural group.

Key properties: Mohs hardness 7.5; specific gravity 3.227; Pale green streak; Vitreous luster; optically uniaxial.

IMA symbol Capov, IMA status: approved, named in 2013.

Found as a primary mineral in metaquartzite (granulite facies) in marble.

It is found associated with Dravite, oxy-chromium-dravite, oxy-dravite, quartz, calcite, chromphyllite, eskolaite, chromite, uvarovite, chromian phlogopite.

The name refers to its relation to povondraite with dominant chromium in the Y site and aluminum in the Z site.

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 C minerals or help write this entry.