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Oxides & Hydroxide

Brandholzite

MgSb₂(OH)₁₂·6H₂O
Hardness2–3
Crystal systemHexagonal
ClassOxides & Hydroxide
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Brandholzite specimen

Sharp colorless crystals of the rare mineral brandholzite on matrix. From: Kriznica Mine, Pernek, Bratislavsky Kraj, Slovakia (Slovak Republic). — Photo: David Hospital · CC BY-SA 4.0

Brandholzite

Brandholzite is an IMA-recognized mineral species in the oxides & hydroxide class, with the chemical formula MgSb₂(OH)₁₂·6H₂O.

It crystallizes in the hexagonal crystal system (space group P3).

Key properties: Mohs hardness 2–3; specific gravity 2.65; White streak; Vitreous luster; optically uniaxial.

IMA symbol Bdh, IMA status: approved, named in 1998.

From oxidized portions of hydrothermal gold-antimony-quartz veins.

It is found associated with Stibnite and antimony-ochers (Brandholz-Goldkronach); roméite-like phases, sulfur, aragonite, gypsum, sénarmontite, Sb-rich Fe hydroxides (Pernek-Krížnica).

The name refers to the occurrence in Germany in the Brandholz-Goldkronach mining district.

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.