Is the principal ore of tin: occur in high temperature veins: granite, rhiolite, pegmatite or alluvial deposit. Clean facetable material is very scarce and a gem weight one carat is considered rare. Cassiterite has a strong dispersive fire ,more than diamond and a very high specific weight.
When is found colorless can be confused with diamond. The hardness is between 6-7 from the Mohs scale.
This stone is from China.
Clarity:visible inclusions at naked eye