Hydrobiotite
Hydrobiotite is an IMA-recognized mineral species in the silicate class, with the chemical formula K(Mg,Fe²⁺)₆(Si,Al)₈O₂₀(OH)₄·nH₂O.
It is a member of the Corrensite, Clay structural group.
Key properties: Mohs hardness 2; specific gravity 2.49–2.64; [Dull.] luster; optically biaxial.
IMA symbol Hbt, IMA status: approved, named in 1882.
Occurs as an alteration product of other micas.
It is found associated with Vermiculite, biotite, apatite, zircon.
The name refers to its resemblance to biotite, but hydrated.
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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