Gaylussite 0.94 ct Round Cut 7.40 mm Searles Lake ,California N450

Gaylussite 0.94ct Round Cut 7.40 mm Searles Lake ,California n450

Is a rare mineral formed in desertic areas ,where the rich salt water precipitates and forms crystals ( evaporite ) The formula is Na Ca (Co3)2 *5H2O , a hydrated calcium sodium carbonate. Is also unstable and can be dehydrated in air and dissolve in water.

The hardness is like calcite : 2.5

This gem comes from Searles Lake ,California . A collectors item, rare to be find in faceted gem.