Krasnoshteinite
Krasnoshteinite is an IMA-recognized mineral species in the borate class, with the chemical formula Al₈[B₂O₄(OH)₂](OH)₁₆Cl₄·7H₂O.
It crystallizes in the monoclinic crystal system (space group P2_1).
Key properties: Mohs hardness 3; specific gravity 2.11; White streak; Vitreous luster; optically biaxial.
IMA symbol Knh, IMA status: approved, named in 2018.
Formed by diagenetic or post-diagenetic processes in halite-carnallite evaporitic rock.
It is found associated with Dritsite, dolomite, magnesite, quartz, baryte, kaolinite, potassic feldspar, congolite, members of the goyazite-woodhouseite series, fluorite, hematite, anatase.
The mineral was named to honor Russian mining engineer and scientist Arkadiy Evgenievich Krasnoshtein (1937- 2009) specialist in the mining of potassium salts for his contributions to the exploitation.