Please enable JavaScript to view this page properly.
Introduction
Classification
Repository
Library
English |
Български
Where am I? >
Home
>
Repository
>
Chalcedony
Gallery view selector
Colour selector
Chalcedony — specimen 0088, photo © NMNHS
Chalcedony
—
specimen 0088
Origin
South America
Brazil
Data
Weight:
1.80 ct;
size:
9.14 | 7.13 | 4.66 mm;
shape:
oval;
colour:
medium very strongly bluish green; slightly greyish;
clarity:
translucent;
cut:
fair;
treatment:
none.
Notes
Clean specimen; mixed style cut.
Other specimens
More specimens
More information from ‘Classification’
Chalcedony
Traditionally defined as a fibrous cryptocrystalline variety of quartz. More recently, it has been shown that much chalcedony is a mixture of quartz and
mogánite
. Pure chalcedony may contain trace amounts of
silanol groups
.
Gemmology — gemstones
Front page
|
Introduction
|
Classification
|
Repository
|
Library
© 2024
National Museum of Natural History, Sofia
(NMNHS)
Use of this website assumes acceptance of our
terms of use
.
The specimens illustrated in this site do not exist in the collections of the National Museum of Natural History, Sofia.