{{Short description|Titanium oxide mineral}} {{Infobox mineral | name = Cafetite | category = oxide mineral | image = File:Cafetite, Lizardite, Calcite-529437.jpg | caption = Yellow cafetite crystals with green lizardite and calcite | formula = {{chem|(Ca,Mg)|(Fe,Al)|2|Ti|4|O|12}}·{{chem|4(H|2|O)}} | IMAsymbol=Cft<ref>{{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}}</ref> | strunz = 4.FL.75 | dana = | system = Monoclinic | class = Prismatic (2/m) <br/><small>(same H-M symbol)</small> | symmetry = ''P2''<sub>1</sub>/n | unit cell = a = 4.944&nbsp;Å, <br/>b = 12.109&nbsp;Å, <br/>c = 15.911&nbsp;Å; <br/>β= 98.93°; Z&nbsp;=&nbsp;8<ref name=atlas/> | color = Pale yellow to colorless | habit = Elongated columnar to acicular crystals, fibrous aggregates, pseudo-orthorhombic | twinning = | cleavage = Prismatic | fracture = | tenacity = Brittle | mohs = 4–5 | luster = Adamantine | refractive = n<sub>α</sub> = 1.95, n<sub>β</sub> = 2.08, n<sub>γ</sub> = 2.11 | opticalprop = Biaxial (–), 2V=58°, Dispersion very strong, r > v | birefringence = δ = 0.16 | 2V = Measured: 38° | pleochroism = none | streak = White | gravity = 3.28 | density = | melt = | fusibility = | diagnostic = | solubility = | diaphaneity = Semitransparent | other = | references = <ref name=atlas>[https://www.mineralienatlas.de/lexikon/index.php/MineralData?mineral=Cafetite Mineralienatlas]</ref><ref name=HDM/><ref name=Mindat/><ref name=webmineral/> }} '''Cafetite''' is a rare titanium oxide mineral with formula {{chem|(Ca,Mg)|(Fe,Al)|2|Ti|4|O|12}}·{{chem|4(H|2|O)}}. It is named for its composition, Ca-Fe-Ti.<ref name=webmineral/>

It was first described in 1959 for an occurrence in the Afrikanda Massif, Afrikanda, Kola Peninsula, Murmanskaja Oblast, Northern Region, Russia.<ref name=Mindat>[http://www.mindat.org/min-850.html Mindat.org]</ref><ref name=HDM>[http://rruff.geo.arizona.edu/doclib/hom/cafetite.pdf Handbook of Mineralogy]</ref> It is also reported from the Khibiny and Kovdor massifs of the Kola Peninsula and from Meagher County, Montana, US.<ref name=Mindat/>

It occurs in pegmatites in a pyroxenite intrusion as crystals in miarolitic cavities. It occurs associated with ilmenite, titaniferous magnetite, titanite, anatase, perovskite, baddeleyite, phlogopite, clinochlore and kassite.<ref name=HDM/>

== References == {{Reflist|refs= <ref name=webmineral>[http://www.webmineral.com/data/Cafetite.shtml Webmineral.com]</ref>}}

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Category:Oxide minerals Category:Titanium minerals Category:Monoclinic minerals Category:Minerals in space group 14

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