Oxy-dravite
Oxy-dravite is an IMA-recognized mineral species in the silicate class, with the chemical formula Na(Al₂Mg)(Al₅Mg)(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; specific gravity 3.073; Pink streak; Vitreous luster; optically uniaxial.
IMA symbol Odrv, IMA status: approved, named in 2012.
Found in quartz-muscovite schist.
It is found associated with Quartz, muscovite.
As a dravite with Al3+ + O2– → Mg2+ + (OH)1– relative to the composition of dravite.
Index entry. This entry combines official IMA/RRUFF species data with published physical-property data — a full written entry hasn’t been published yet.
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