Warwickite

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]

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]

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]

References

  1. ↑ Mineralienatlas
  2. ↑ http://webmineral.com/data/Warwickite.shtml Webmineral
  3. ↑ http://www.mindat.org/min-4245.html Mindat
  4. ↑ http://rruff.geo.arizona.edu/doclib/hom/warwickite.pdf Handbook of Mineralogy
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