Where am I? >
Gallery view selector
Chalcedony — specimen 0265, photo © NMNHS
no precise locality [Africa]
9.79 | 7.16 | 4.99 mm;
Clean specimen; design ‘Hexaelongatis 2’, excellent cut by Tan Pen.
More information from ‘Classification’
Traditionally defined as a fibrous cryptocrystalline variety of quartz. More recently, it has been shown that much chalcedony is a mixture of quartz and
. Pure chalcedony may contain trace amounts of
Gemmology — gemstones
National Museum of Natural History, Sofia
Use of this website assumes acceptance of our
The specimens illustrated in this site do not exist in the collections of the National Museum of Natural History, Sofia.