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Borate

Rhabdoborite-(Mo)

Mg₁₂Mo⁶⁺₁.₃₃O₆(BO₃)₆F₂
Crystal systemHexagonal
ClassBorate
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Rhabdoborite-(Mo)

Rhabdoborite-(Mo) is an IMA-recognized mineral species in the borate class, with the chemical formula Mg₁₂Mo⁶⁺₁.₃₃O₆(BO₃)₆F₂.

It crystallizes in the hexagonal crystal system (space group P6_3). It is a member of the Rhabdoborite structural group.

Key properties: specific gravity 3.42; White streak; Vitreous luster; optically uniaxial.

IMA symbol Rbo-Mo, IMA status: approved, named in 2020.

A volcanic sublimate or, more probably, formed by the interaction between fumarolic gas and basalt scoria.

It is found associated with Rhabdoborite-(V), rhabdoborite-(W), anhydrite, diopside, hematite, schäferite, berzeliite, svabite, calciojohillerite, ludwigite, forsterite, magnesioferrite.

Refers to morphological (rhabdos is “rod”, in Greek) and chemical (borate) features of the mineral; a suffix indicates the dominant element as the M component.

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 R minerals or help write this entry.