Emerald Aragonite (cave calcite) from Mina

Aragonite (cave calcite) from Mina potosi

are found in a variety of environments like volcanic or sedimentary settings

titanium or aluminium or natural radiation gives quartz a vast array of colours and varieties

Pyrite from PeruSize-4

Gerastos is a genus of proetid trilobite in the family Proetidae that lived between the Pragian and Eifelian of the Lower-middle Devonian

Emerald Aragonite (cave calcite) from MinaEmerald from Brazil Size 3. 2cm x 3. 4cm x 2cm Weight 40g You will receive the item in the photo Emerald is a green gem variety of the mineral Beryl (beryllium aluminium silicate). Its deep green comes from amounts of trace amounts of chromium or vanadium. Emerald belongs to the hexagonal crystals system and the mineral class is silicate. Its hardness is 7. 5 8on the MOHs scale. Emeralds are rare because the require two incompatible elements.