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PETALITE

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Originally appearing in Volume V21, Page 285 of the 1911 Encyclopedia Britannica.
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PETALITE , a See also:

mineral See also:species consisting of See also:lithium See also:aluminium silicate, LiA1(SizO5)2• The See also:monoclinic crystals approach See also:spodumene (q.v.) in See also:form, which is also a lithium aluminium silicate with the See also:formula LiAI(SiO3)2. There is a perfect cleavage parallel to the basal See also:plane, and the mineral usually occurs in platy cleavage masses; on this See also:account it was named, from Gr. srEraXov (a See also:leaf). The hardness is 62 and the specific gravity 2.4 (that of spodumene being 3.16). The mineral is colourless or occasion-ally reddish, varies from transparent to translucent, and has a vitreous lustre. It was discovered in 1800 as cleavage masses in an See also:iron mine on the See also:island of Uto in the See also:Stockholm See also:archipelago, where it is associated with See also:lepidolite, See also:tourmaline (See also:rubellite and indicolite) and spodumene. A variety known as " See also:castor " is found as transparent glassy crystals associated with See also:pollux (q.v.) in cavities in the See also:granite of See also:Elba. (L. J.

End of Article: PETALITE

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