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Encyclopedia Britannica



TRIDYMITE

This article appears in Volume V27, Page 268 of the Encyclopedia Britannica.

Encyclopedia Britannica - Main :: TOO-TUM
TRIDYMITE , a
mineral
  consisting of silicon
oxide
  or
silica
 , SiO2, but differing from
quartz
  in crystalline form. The crystals are small, thin hexagonal plates or scales, which are usually twinned together in groups of three; hence the name of the
mineral
 , from
Greek
  rplSvilos, triplet. The apparent hexagonal plates are themselves pseudo-symmetric twins of optically biaxial material, and the exact crystalline form is doubtful. The plates are colourless and transparent and have a vitreous lustre. The hardness is 7 and the specific gravity 2.3 (that of
quartz
  being 2.65). Unlike quartz, it is soluble in a boiling solution of sodium carbonate. Tridymite occurs in the cavities of acid volcanic rocks (rhyolite, trachyte and andesite); the best-known localities are Cerro San Cristobal near Pachuca in
Mexico
 , the Euganean Hills near Padua, and the
Siebengebirge
  on the Rhine. Probably identical with tridymite is the form of
silica
  known as asmanite, found in the meteorite which
fell
  at Breitenbach in the Erzgebirge, Bohemia. (L. J. S.)


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