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Museum Specimens
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      Aventurine is a translucent to opaque variety of micro crystalline quartz. It contains small inclusions of shiny
minerals which give the stone a sparkling effect known as aventurescence. Aventurine commonly ranges from light
to dark-green in color. The color is caused by trace elements of fuchsite in colorless quartz. Fuchsite is a chromium-
rich variety of muscovite. Aventurine is often so heavily included with fuchsite, that it may be defined as a rock rather
than a mineral. Aventurine is still classified as quartz by most geologists, who consider the fuchsite to be an
inclusion within the quartz.

Aventurine's natural effect of 'aventurescence' ranges from weak to intense. The level of intensity depends on the
quantity and size of the metallic inclusions. The color of Aventurine varies depending on which inclusions are
present. Most Aventurine quartz appears almost banded with lighter and darker color layers. Aventurine has a
grainy texture in its rough state, but when polished it has an attractive, soft and dull vitreous luster. Aventurine quartz
is sometimes confused with Aventurine feldspar.  Feldspar coloring is orange to red and it is more transparent,
which makes it easily identifiable. The Aventurine feldspar variety is referred to as "
Sunstone" while the Aventurine
quartz variety is referred to simply as "
Aventurine". Deposits are found in Brazil, India, Austria, Russia, and

It is interesting that the name for the stone is derived from an accident. Sometime during the 18th century, Venetian
glass workers were preparing molten glass when copper filings accidentally fell into the batch producing a glass
with sparkles. The name Aventurine comes from the Italian "a ventura," which means “by chance". Although it was
known first, goldstone is now a common imitation of Aventurine and Sunstone.
Aventurine with Display Stand from Brazil

From our Personal Collection comes this Old Stock specimen of Green Aventurine from Brazil

This specimen weighs 24.3 oz or 1.51 lbs (688g) and measures 4.2 x 3.4 x 1.9 inches (10.8 x 8.6 x 4.8cm)
and stands on a 1" (2.6cm) tall wooden base
Item# AVEN06148851
Aventurine Display with Stand
from Brazil