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Encyclopedia Britannica



SYLVANITE

This article appears in Volume V26, Page 284 of the Encyclopedia Britannica.

Encyclopedia Britannica - Main :: SUS-TAV
SYLVANITE , a
mineral
  consisting of gold and silver telluride, AuAgTe4, containing gold 24.2 and silver 13.3 %; an important ore of gold. Crystals are
monoclinic
  and often very
rich
  in faces; they are frequently twinned, giving rise to branching forms resembling written characters; on this
account
  the
mineral
  was early known as " graphic gold " or " graphic tellurium " (Ger. Schrifterz). It was also known as "
white
  gold," the colour being tin-
white
  with a brilliant metallic lustre. The hardness is 2 and the specific gravity 8.2. It occurs with native gold in veins traversing
porphyry
  at Offenbanya and Nagyag, near
Deva
  in Transylvania (from which country it takes its name) ; also at several places in Boulder county, Colorado, and at Kalgoorlie in Western Australia. Sylvanite may be
readily distinguished from calaverite (AuTez) by its perfect cleavage in one direction (parallel to the plane of symmetry), but in this
character
  it resembles the very rare orthorhombic
mineral krennerite ([Au, Ag]Tez). (L. J. S.)


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