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Encyclopedia Britannica



WOLLASTONITE

This article appears in Volume V28, Page 777 of the Encyclopedia Britannica.

Encyclopedia Britannica - Main :: WIL-YAK
WOLLASTONITE , a
rock
 -forming
mineral
  consisting of calcium metasilicate, CaSiO3, crystallizing in the monoclinic system and belonging to the pyroxene (q.v.) group. It differs, however, from other members of this group in having cleavages, not parallel to the prism-faces, but in two directions perpendicular to the
plane of symmetry. Crystals are usually elongated parallel to the
axis
  of symmetry and flattened parallel to the ortho-pinacoid, hence the early name " tabular spar "; the name wollastonite is after W. H. Wollaston. The
mineral
  usually occurs in white cleavage masses. The hardness is 5, and the specific gravity 2.85. It is a characteristic product of contact-metamorphism, occurring especially, with garnet,
diopside
 , &c., in crystalline limestones. Crystals are found in the cavities of the ejected limestone blocks of Monte Somma,
Vesuvius
 . At Santa Fe in the State of
Chiapas
 ,
Mexico
 , a large
rock
 -mass of wollastonite carries ores of gold and copper: here are found large
pink
  crystals which are often partially or wholly altered to opal. (L. J. S.)


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