Warwickite
| Warwickite | |
|---|---|
 Warwickite sample | |
| General | |
| Category | Borate mineral |
| Formula (repeating unit) | (Mg,Fe2+)3Ti[O,BO3]2 |
| IMA symbol | Wwk[1] |
| 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 | [2] |
Warwickite is an iron magnesium titanium borate mineral with the chemical 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.[3][4]
Occurrence
[edit]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.[5]
References
[edit]- ^ 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
- ^ 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
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