Cahnite
Cahnite | |
---|---|
![]() Cahnite on rhodonite | |
General | |
Category | Borate minerals |
Formula (repeating unit) | Ca2B[AsO4](OH)4 |
IMA symbol | Cah[1] |
Strunz classification | 6.AC.70 |
Crystal system | Tetragonal |
Crystal class | Disphenoidal (4) (same H-M symbol) |
Space group | I4 |
Identification | |
Color | Colorless to white |
Cleavage | Perfect On {110} |
Tenacity | Brittle |
Mohs scale hardness | 3 |
Luster | Vitreous |
Diaphaneity | Transparent |
Density | 3.156 g/cm3 |
References | [2] |
Cahnite (Cahnit in German, Cahnita in Spanish, Канит in Russian[3]) 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.[4][5] Cahnite was discovered in the year 1921.[3] It was named Cahnite to honor Lazard Cahn (1865–1940), who was a mineral collector and dealer.[4] It is usually found in the Franklin Mine, in Franklin, New Jersey.[5][4] Until the year 2002, when a sample of cahnite was found in Japan, that was the only known place that cahnite was located.[6] The geological environment that it occurs in is in pegmatites cutting a changed zinc orebody.[3][4][5] The chemical formula for cahnite is Ca2B[AsO4](OH)4.[5][7][8] 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.[5] Cahnite is not radioactive.[4] Cahnite is associated with these other minerals: willemite, rhodonite, , , datolite, and baryte.[3]
References[]
- ^ Warr, L.N. (2021). "IMA–CNMNC approved mineral symbols". Mineralogical Magazine. 85 (3): 291–320. Bibcode:2021MinM...85..291W. doi:10.1180/mgm.2021.43. S2CID 235729616.
- ^ Mineralienatlas
- ^ a b c d Mindat data sheet for Cahnite.
- ^ a b c d e Mineral Data sheet for Cahnite.
- ^ a b c d e Database entry from Mineral Collecting.[permanent dead link]
- ^ Article stating that veins of cahnite were found in Okayama Prefecture. Archived 2012-02-17 at the Wayback Machine
- ^ Database entry for Cahnite from Mincryst.
- ^ Database entry for Cahnite from Japanese database.
- Mineral stubs
- Minerals
- Arsenate minerals
- Calcium minerals
- Borate minerals
- Tetragonal minerals
- Minerals in space group 82