necklace from black vesuvian and hematite. macro shot on white background

agate american beryllian beryllium californite cerian cerium chrome chrysolite collection crystal cyprin diortosilicate emerald gem gemmology gemology gemstone genevit geological geology glass groups idokraz island jade manganoan material metamorphic mineral ore ornamental pebble piece sample specimen stone variety vesuvian vesuviana vesuvianite vesuvio vesuvius viluite volcanic xanthite