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From Wikipedia, the free encyclopedia

Cahnite on rhodonite
CategoryBorate minerals
(repeating unit)
Strunz classification6.AC.70
Crystal systemTetragonal
Crystal classDisphenoidal (4)
(same H-M symbol)
Space groupI4
ColorColorless to white
On {110}
Mohs scale hardness3
Density3.156 g/cm3

Cahnite (Cahnit in German, Cahnita in Spanish, Канит in Russian[2]) is a brittle white or colorless mineral that has perfect cleavage and is usually transparent. It usually forms tetragonal-shaped crystals and it has a hardness of 3 mohs.[3][4] Cahnite was discovered in the year 1921.[2] It was named Cahnite to honor Lazard Cahn (1865–1940), who was a mineral collector and dealer.[3] It is usually found in the Franklin Mine, in Franklin, New Jersey.[4][3] Until the year 2002, when a sample of cahnite was found in Japan, that was the only known place that cahnite was located.[5] The geological environment that it occurs in is in pegmatites cutting a changed zinc orebody.[2][3][4] The chemical formula for cahnite is Ca2B[AsO4](OH)4.[4][6][7] It is made up of 26.91% calcium, 3.63% boron, 25.15% arsenic, 1.35% hydrogen, and 42.96% oxygen. It has a molecular weight of 297.91 grams.[4] Cahnite is not radioactive.[3] Cahnite is associated with these other minerals: willemite, rhodonite, pyrochroite, hedyphane, datolite, and baryte.[2]


This page was last edited on 1 January 2021, at 06:11
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