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Calcentine: See Ammolite.
Calcium: A silvery-white, moderately hard metallic element which is the fifth most abundant element comprising approximately 3% of the earth's crust, and is a basic component of most animals and plants.
AmmoliteAmmolite (also known as korite, calcentine, or Buffalo Stone.) is a fossilized, opalized ammonite shell used as a gemstone (it is the shell of the ammonite, a fossilized marine animal, a cephalopod).
Also known as korite, calcentine, or Buffalo Stone, Ammolite is a fossilized, opalized ammonite shell used as a gemstone. It is a grey, iridescent stone with flashes of green, red, yellow or - more rarely - blue or purple.
Ammolite: (also known as Buffalo Stone, calcentine, or korite) is the fossilized shell of the ammonite, an ancient cephalopod. It can be used as a gemstone and is a gray, iridescent stone with flashes of blue, green, purple, red, or yellow.
It is also known as korite, calcentine, or Buffalo Stone. Ammolite is usually treated with a colorless, hard material to increase the strength of the stone and is often mounted as a doublet or a triplet. It is only found in southern Alberta, Canada.
Sources -- Alberta, Canada, appears to be the only known source of ammolite, a 70 million year old fossilized ammonite (a cephalopod, or squid-like animal). Ammolite is also known, less frequently, as korite or calcentine.
rare and valuable opal-like organic gemstone, it is made of the fossilized shells of ammonites, which in turn are composed primarily of aragonite, the same mineral that makes up nacreous pearls. Ammolite is also known as gem ammonite, calcentine, ...
 See also: Quartz, Ammolite, Aragonite, Surface, Agate
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