Cahnite
| Cahnite | |
|---|---|
|
Cahnite on rhodonite | |
| General | |
| Category | Borate minerals |
| Formula (repeating unit) | Ca2B[AsO4](OH)4 |
| 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 | [1] |
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]
References
- ↑ Mineralienatlas
- 1 2 3 4 Mindat data sheet for Cahnite.
- 1 2 3 4 5 Mineral Data sheet for Cahnite.
- 1 2 3 4 5 Database entry from Mineral Collecting.
- ↑ Article stating that veins of cahnite were found in Okayama Prefecture.
- ↑ Database entry for Cahnite from Mincryst.
- ↑ Database entry for Cahnite from Japanese database.