Cahnite

A variety of Minerals

Cahnite specimen - rock identification

What is Cahnite?

Cahnite (Cahnit in German, Cahnita in Spanish, Канит in Russian) 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. 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. The geological environment that it occurs in is in pegmatites cutting a changed zinc orebody. The chemical formula for cahnite is Ca2BAsO44. 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.

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Cahnite Localities Map

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North ZoneCentral RidgeSouth Basin

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Quick Facts

Physical Properties

Color
Colorless to white, also golden brown; colourless in transmitted light.
Hardness (Mohs)
3
Density
3.22 g/cm³
Streak
White

Chemical Properties

Chemical Formula
Ca2B(OH)4
Elements
As, B, Ca, H, O
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