The following is a list of Mollusk gems and minerals listed in our database. Click the pictures to get full data, click the X to remove the gem from the list.
Pearl: Pearl is one of four main ornamental materials that are classified as "organic" gems, the other three being coral, ivory, and amber. About 92 percent of pearl is calcium carbonate, in the form of aragonite crystals, held together by an organic substance (concholin), which is identical to the horny outer layer of oyster shells, plus a small quantity of water. Mother-of-pearl has a simila (read full)
Shell: Shell is the hard, protective, outer layer covering of certain creatures found in saltwater or freshwater, such as mollusks, snails, and turtles. This layer consists of calcium-carbonate and chitin, secreted by the soft tissue mantle of most mollusks. The inner surface of the shell is made from smooth nacre which covers the mantle.
Shell is used as inexpensive material for various purposes (read full)
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Euclase is a silicate with a monoclinic crystal system. It is considered a very rare gem of light blue color.
It appears as long or 
Dolomite is similar to calcite and sits along side it in limestone. It usually occurs as a secondary mineral, formed by the reaction of
The transparent, colored crystals, which also have good luster, are widely used as gems.
Silver is a Native Element with an isometric system, a soft, white, precious metallic element of group 1 of the Periodic System with th