Carmichaelite
Carmichaelite is an IMA-recognized mineral species in the oxides & hydroxide class, with the chemical formula (Ti,Cr,Fe)(O,OH)₂.
It crystallizes in the monoclinic crystal system (space group P2_1/c).
Key properties: Mohs hardness 2.5; specific gravity 1.602; Greasy, shining luster; optically biaxial.
IMA symbol Cmh, IMA status: approved, named in 1996.
Thought to form in saline marine deposits by reaction of pre-existing saline minerals with fluids high in potash.
It is found associated with Kieserite, sylvite, halite, polyhalite, bischofite.
The name refers to Rudolph von Carnall (1804–1874), Prussian mining engineer.
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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