Warwickite
Warwickite is an iron magnesium titanium borate mineral with formula: (MgFe)3Ti(O, BO3)2 or Mg(Ti,Fe3+, Al)(BO3)O. It occurs as brown to black prismatic orthorhombic crystals which are vitreous and transparent. It has a Mohs hardness of 3 to 4 and a specific gravity of 3.36.[2][3]
| Warwickite | |
|---|---|
 Warwickite sample | |
| General | |
| Category | Borate mineral |
| Formula (repeating unit) | (Mg,Fe2+)3Ti[O|BO3]2 |
| Strunz classification | 6.AB.20 |
| Crystal system | Orthorhombic |
| Crystal class | Dipyramidal (mmm) H-M symbol: (2/m 2/m 2/m) |
| Space group | Pnam |
| Identification | |
| Color | dark brown, grey to black¨ |
| Cleavage | perfect on {100} |
| Fracture | irregular/uneven |
| Mohs scale hardness | 3-4 |
| Luster | sub-Vitreous, pearly, sub-metallic, dull |
| Streak | bluish black |
| Specific gravity | 3.34 - 3.36 |
| References | [1] |
Occurrence
It occurs metasomatized limestone skarns and in lamproite and carbonatite veinlets. It was first described in 1838 near Warwick, Orange County, New York. It has also been reported from Bancroft, Ontario; in Murcia Province, Spain; in Siberia and near Pyongyang, North Korea.[4]
gollark: What is gollarkpotatodrive?
gollark: When I have a USB stick someone wants me to image, I just run `dd` on it and the USB stick instantly vanishes.
gollark: `dd` stands for `delete disk`.
gollark: I just use `dd`.
gollark: Activating 13375p3ak.
References
- Mineralienatlas
- http://webmineral.com/data/Warwickite.shtml Webmineral
- http://www.mindat.org/min-4245.html Mindat
- http://rruff.geo.arizona.edu/doclib/hom/warwickite.pdf Handbook of Mineralogy
This article is issued from Wikipedia. The text is licensed under Creative Commons - Attribution - Sharealike. Additional terms may apply for the media files.