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Sphene
Sphene also known as titanite is a gemstone of high luster that ,with brilliant cut, displays exquisite fire rivaling that of a diamond. It is one of the world's finest gemstones. However, because it is soft and brittle and because it has been a rare gem on the market, it has mainly been a stone for collectors and has lacked public popularity. Recently-discovered new deposits will surely increase store quantities. Sphene is a fairly rare stone and is classed as collector's stone. It is found in Austria, Switzerland, Canada, Madagascar, Burma, and Mexico. The hardness is 5 - 5.5, a soft stone on Mohs scale and specific gravity is 3.45 - 3.56.
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