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C D E
F G H
M N O
T U V
W X Y Z
Chalcedony is a form of silica. It has a waxy luster, and may be translucent. It has
a wide range of colors, most common are white to gray, blue gray and brown
ranging from pale to nearly black. Many gemstones are forms of chalcedony
including agate, carnelian, chrysoprase and bloodstone.
found in the Charo River Valley in Siberia. It is a remarkable stone
with distinct color and patterns. It is composed of several minerals,
mostly pure Charoite mineral, with slight amounts of microcline
feldspar, aergirine-augite and tinaksite. The mineral Charoite gives
this gem its unique purple color. Itís swirling patterns are formed by
interlocking fibrous crystals. As a gem it is reasonably tough with a
hardness between 5 and 6 and no cleavage..
The best Charoite gems have a slight chatoyancy.
Chinese Writing Stone
is a limestone matrix with andalusite crystals. The crystals resemble the
symbols of Chinese writing which is how the stone was given itís name. It
is found in California in the Sierra Nevada foothills. It is often
confused with Chrysanthemum stone which comes from China and has much the
same structure. Chrysanthemum stone differs in the crystals form larger
shapes resembling the flower for which they are named.
is an attractive blue
green unique in the mineral world. The beauty of this gemstone is further
enhanced by the intricate swirling patterns it contains. Chrysocolla forms
in oxidation zones of copper rich ore bodies. In it's pure form Chrysocolla
is soft and fragile. However, Chrysocolla which has been "agatized" in chalcedony
quartz is more durable and easily polished. It is a copper bearing
mineral found wherever copper deposits occur. Notable deposits are found
in Africa, Chile, England, and the U.S. Healing Properties
is a rare valuable variety chalcedony or quartz. Itís green color comes
from the traces of nickel. It was used by the ancient Greeks, Romans and
Egyptians to make seals, signets and jewelry. The green color can vary from
pale green, apple green and rich green. Generally opaque with better quality
stones being translucent, however translucent chrysoprase is very rare.
Found in Australia, Brazil, the Ural Mountains, and the U.S.
is full of coquina fossilized clams. It
comes from Indian and is also known as Elephant Jasper. This fossil
stone forms near the seashore where the tiny clams are mixed with sand.
Bone Fossils These
are the mineralized remains of dinosaur bones. As with other fossils the
original animal bone, shell or plant has been replaced by minerals or become
petrified. Dinosaur bone can come in a variety of colors most commonly
brown, dark red and grey although it can be yellow or orange.
is a somewhat rare gemstone,
which is well known for its distinctive colors including magenta, pink,
blue, yellow and brown. Eudialyte is actually made up of several minerals;
Sodium, Calcium, Cerium, Iron, Manganese, Zirconium, Silicon, Hydrogen and
Chlorine. Eudialyte is usually found embedded in the host rock surrounded
by other minerals. Most of the Eudialyte on the market today comes from
the Kola Peninsula of Russia. Eudialyteís rare beauty and distinctive colors
have made it popular among mineral collectors.
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