Caryochroite
Caryochroite is an IMA-recognized mineral species in the silicate class, with the chemical formula (Na,Sr)₃(Fe³⁺,Mg)₁₀Ti₂Si₁₂O₃₇(H₂O,O,OH)₁₇.
It crystallizes in the monoclinic crystal system.
Key properties: Mohs hardness 2.5; specific gravity 2.99; Pale brownish yellow streak; Dull to waxy luster; optically biaxial.
IMA symbol Cyh, IMA status: approved, named in 2005.
Product of the supergene alteration of an unidentified Fe2+-rich protophase in cavities in the albite zone of a pegmatite.
It is found associated with Albite, elpidite, epididymite, quartz, natrolite, pyrite, galena, sphalerite, bitumen.
Its name comes from the Greek for “nut” and “color” in allusion to its hazel-brown color.
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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