Warwickite

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Warwickite
Warwickite.jpg
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
Colordark brown, grey to black¨
Cleavage perfect on {100}
Fracture irregular/uneven
Mohs scale hardness3-4
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 (Mg Fe)3 Ti(O, BO3)2orMg(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

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]

Related Research Articles

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9
(Mg,Fe3+
)(SiO
4
)
6
(SiO
3
OH)(OH)
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. The cerium and lanthanum content varies with the Ce rich species and the La rich species. Analysis of a sample from the Mountain Pass carbonatite gave 35.05% Ce
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O
3
and 30.04% La
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2
Al
4
Si
2
O
10
(OH)
4
. It occurs as greenish grey to black platy micaceous crystals and foliated masses. Its Mohs hardness is 6.5, unusually high for a platy mineral, and it has a specific gravity of 3.52 to 3.57. It typically occurs in phyllites, schists and marbles.

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2
Ti
4
O
12
·4(H
2
O)
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References

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