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{{Infobox mineral
| name = Petalite
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| image = Petalite.jpg
| imagesize =
| caption = Petalite from Minas Gerais State, Brazil (size: 3x4 cm)
| formula = LiAlSi<sub>4</sub>O<sub>10</sub>
| molweight =
| strunz = 09.EF.05
| symmetry = Monoclinic prismatic<br/>]: (2/m) <br/>]: P 2/a
| unit cell = a = 11.737 Å, b = 5.171 Å, c = 7.63 Å; β = 112.54°; Z = 2
| color = Colorless, grey, yellow, pink, to white
| habit = Tabular prismatic crystals and columnar masses
| system = ]
| twinning = Common on {001}, lamellar
| cleavage = Perfect on {001}, poor on {201} with 38.5° angle between the two
| fracture = Subconchoidal
| tenacity = Brittle
| mohs = 6 - 6.5
| luster = Vitreous, pearly on cleavages
| refractive = n<sub>α</sub>=1.504, n<sub>β</sub>=1.510, n<sub>γ</sub>=1.516
| opticalprop = Biaxial (+)
| birefringence = δ = 0.012
| 2V = 82 – 84° measured
| pleochroism =
| streak = Colorless
| gravity = 2.4
| density =
| melt = 1350 °C<ref>{{cite web|title=Petalite|url=http://digitalfire.com/4sight/material/petalite_1114.html|publisher=Digital Fire|accessdate=23 October 2011}}</ref>
| fusibility = 5
| diagnostic =
| solubility = Insoluble
| diaphaneity = Transparent to translucent
| other =
| references = <ref name=HBM></ref><ref name=Webmin></ref><ref name=Mindat></ref><ref name=Klein>*Hurlbut, Cornelius S. and Klein, Cornelis, 1985, ''Manual of Mineralogy,'' Wiley, 20th ed., pp. 459-460 ISBN 0-471-80580-7</ref>
}}


'''Petalite''', also known as '''castorite''', is a ] ] ] ] ]]]<sub>4</sub>]<sub>10</sub>, crystallizing in the ] system. Petalite is a member of the ] group. It occurs as colourless, grey, yellow, yellow grey, to white tabular crystals and columnar masses. Occurs in lithium-bearing ]s with ], ], and ]. Petalite is an important ore of lithium, and is converted to ] and ] by heating to ~500&nbsp;°C and under 3&nbsp;kbar of pressure in the presence of a dense hydrous alkali borosilicate fluid with a minor carbonate component.<ref>{{cite book|first=W. A. Deer|title=Framework silicates: silica minerals, feldspathoids and the zeolites|year=2004|publisher=Geological Soc.|location=London|isbn=1-86239-144-0|pages=296|edition=2. ed.}}</ref> The colorless varieties are often used as ]s.
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Discovered in 1800, type locality: ], ], ]. The name is derived from ] petalon for ''leaf''.<ref name=Mindat/>


==References==
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Revision as of 20:46, 1 December 2012

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