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Cahnite
Cahnite (Cahnit in German, Cahnita in Spanish, Канит in Russian〔(Mindat data sheet for Cahnite. )〕) 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.〔(Mineral Data sheet for Cahnite. )〕〔(Database entry from Mineral Collecting. )〕 Cahnite was discovered in the year 1921.〔 It was named Cahnite to honor Lazard Cahn (1865–1940), who was a mineral collector and dealer.〔 It is usually found in the Franklin Mine, in Franklin, New Jersey.〔〔 Until the year 2002, when a sample of cahnite was found in Japan, that was the only known place that cahnite was located.〔(Article stating that veins of cahnite were found in Okayama Prefecture. )〕 The geological environment that it occurs in is in pegmatites cutting a changed zinc orebody.〔〔〔
The chemical formula for cahnite is Ca2B()(OH)4.〔〔(Database entry for Cahnite from Mincryst. )〕〔(Database entry for Cahnite from Japanese database. )〕 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.〔 Cahnite is not radioactive.〔 Cahnite is associated with these other minerals: willemite, rhodonite, pyrochroite, hedyphane, datolite, and baryte.〔
==References==
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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