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Encyclopedia Britannica



PETALITE

This article appears in Volume V21, Page 285 of the Encyclopedia Britannica.

Encyclopedia Britannica - Main :: PER-PIG
PETALITE , a
mineral
  species consisting of lithium
aluminium
  silicate, LiA1(SizO5)2 The monoclinic crystals approach spodumene (q.v.) in form, which is also a lithium
aluminium
  silicate with the
formula
  LiAI(SiO3)2. There is a perfect cleavage parallel to the basal plane, and the
mineral
  usually occurs in platy cleavage masses; on this account it was named, from Gr. srEraXov (a
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
iron
  mine on the
island
  of Uto in the Stockholm archipelago, where it is associated with
lepidolite
 , tourmaline (rubellite and indicolite) and spodumene. A variety known as " castor " is found as transparent glassy crystals associated with pollux (q.v.) in cavities in the granite of Elba. (L. J. S.)


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