Adelite
Adelite | |
---|---|
General | |
Category | |
Formula (repeating unit) | CaMg(AsO4)(OH) |
Strunz classification | 8.BH.35 |
Dana classification | 41.5.1.1 |
Crystal system | Orthorhombic |
Crystal class | 2 2 2 - Disphenoidal |
Space group | P212121 |
Identification | |
Color | Colourless, white, grey, bluish grey, yellowish grey, yellow, pale green, pinkish brown, brown |
Crystal habit | Elongate crystals, massive |
Cleavage | None Observed |
Mohs scale hardness | 5 |
Luster | Vitreous, Greasy |
Diaphaneity | Transparent, Translucent |
Specific gravity | 3.73 to 3.79 |
Optical properties | Biaxial (+), colorless (transmitted light) |
References | [1] |
The rare mineral adelite, (IMA symbol Ade[2]) is a calcium, magnesium, arsenate with chemical formula CaMgAsO4OH. It forms a solid solution series with the vanadium-bearing mineral gottlobite. Various transition metals substitute for magnesium and lead replaces calcium leading to a variety of similar minerals in the adelite - duftite group.
Adelite forms variably colored (blue, green, yellow and grey) crystals in the orthorhombic crystal system. The form is typically massive. It has a Mohs hardness rating of 5 and a specific gravity of 3.73 to 3.79.
It was first described in 1891 from Värmland, Sweden. Its name comes from the Greek word for indistinct.
Geologic occurrence[]
Adelite has been found in ore deposits in Algeria, Germany, Italy, Sweden and the USA.[1]
See also[]
References[]
Look up adelite in Wiktionary, the free dictionary. |
- ^ a b Mindat.org
- ^ Warr, L.N. (2021). "IMA-CNMNC approved mineral symbols". Mineralogical Magazine. 85: 291–320.
Bibliography[]
- Palache, P.; Berman H.; Frondel, C. (1960). "Dana's System of Mineralogy, Volume II: Halides, Nitrates, Borates, Carbonates, Sulfates, Phosphates, Arsenates, Tungstates, Molybdates, Etc. (Seventh Edition)" John Wiley and Sons, Inc., New York, pp. 804-806.
- Arsenate minerals
- Calcium minerals
- Magnesium minerals
- Orthorhombic minerals
- Minerals in space group 19
- Mineral stubs