warwickite

{{Infobox mineral

| name = Warwickite

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| image = Warwickite.jpg

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| caption = Warwickite sample

| category = Borate mineral

| formula = {{chem2|(Mg,Fe(2+))3Ti[O,BO3]2}}

| IMAsymbol = Wwk{{Cite journal|last=Warr|first=L.N.|date=2021|title=IMA–CNMNC approved mineral symbols|journal=Mineralogical Magazine|volume=85|issue=3|pages=291–320|doi=10.1180/mgm.2021.43|bibcode=2021MinM...85..291W|s2cid=235729616|doi-access=free}}

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| strunz = 6.AB.20

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| system = Orthorhombic

| class = Dipyramidal (mmm)
H-M symbol: (2/m 2/m 2/m)

| symmetry = Pnam

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| color = dark brown, grey to black¨

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| cleavage = perfect on {100}

| fracture = irregular/uneven

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| mohs = 3-4

| luster = sub-Vitreous, pearly, sub-metallic, dull

| streak = bluish black

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| gravity = 3.34 - 3.36

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| references = [https://www.mineralienatlas.de/lexikon/index.php/MineralData?mineral=Warwickite Mineralienatlas]

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Warwickite is an iron magnesium titanium borate mineral with the chemical formula {{chem2|(MgFe)3Ti(O, BO3)2}} or {{chem2|Mg(Ti,Fe(3+), 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.http://webmineral.com/data/Warwickite.shtml Webmineralhttp://www.mindat.org/min-4245.html Mindat