| Warwickite | |
| Category: | Borate mineral |
| Imasymbol: | Wwk[1] |
| Strunz: | 6.AB.20 |
| System: | Orthorhombic |
| Class: | Dipyramidal (mmm) H-M symbol: (2/m 2/m 2/m) |
| Symmetry: | Pnam |
| Color: | dark brown, grey to black¨ |
| Cleavage: | perfect on |
| Fracture: | irregular/uneven |
| Mohs: | 3-4 |
| Luster: | sub-Vitreous, pearly, sub-metallic, dull |
| Streak: | bluish black |
| Gravity: | 3.34 - 3.36 |
| References: | [2] |
Warwickite is an iron magnesium titanium borate mineral with the chemical formula or . 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]
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 nearPyongyang, North Korea.[5]