This is a cluster of exceptionally large, gemmy Dioptase clusters on a bed of calcite crystals from the Altyn-Tyube Deposit in Kazakhstan. The largest single Dioptase crystals measures over 1/2" across. Comes with an acrylic display base.
Dioptase is an uncommon mineral found mostly in desert regions where it forms as a secondary mineral in the oxidized zone of copper sulfide mineral deposits. This copper based mineral forms small rhombohedral crystals, typically less than 0.75 cm in length.
It is popular with mineral collectors due to it's vibrant color and it is occasionally cut into small emerald-like gems.