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Encyclopedia Britannica



AVENTURINE, or AVANTURINE

This article appears in Volume V03, Page 54 of the Encyclopedia Britannica.

Encyclopedia Britannica - Main :: AUD-BAI
AVENTURINE, or AVANTURINE , a variety of
quartz
  containing spangles of mica or scales of
iron
 -
oxide
 , which confer brilliancy on the stone. It is found chiefly in the Ural Mountains, and is cut for ornamental purposes at Ekaterinburg. Some of the Siberian aventurine, like that of the vase given by Nicholas I. to Sir R. Murchison, in 1843, is a micaceous
iron
 -stained
quartz
 , of but little beauty. Most aventurine is of reddish brown or yellow colour, but a green variety, containing scales of fuchsite or chrome-mica, is also known. This green aventurine, highly valued by the Chinese, is said to occur in the Bellary
district
  in India.
Aventurine felspar, known also as Sun-stone (q.v.) is found principally at Tvedestrand in
south
  Norway, and is a variety of oligoclase enclosing micaceous scales of haematite. Other kinds of felspar, even orthoclase, may however also show the aventurine
appearance
 . Both plagioclastic and orthoclastic aventurine occur at several localities in the United States.
The
mineral
  aventurine takes its name from the well-known aventurine-glass of Venice. This is a reddish brown glass with gold-like spangles, more brilliant than most of the natural stone. The story runs that this
kind
  of glass was originally made accidentally at Murano by a workman, who let some copper filings fall into the molten " metal," whence the product was called avventurino. From the Murano glass the name passed to the
mineral
 , which displayed a rather similar
appearance
 . (F. W. R.*)


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