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but gem-quality minerals such as heliodor and topaz only became known to the wider collector market in the late 20th century
These inclusions scatter light and give the opal its delicate pink appearance
This gives aragonite its unique physical properties and characteristic needle-like formations
the Moscona Mine in northern Spain was registered in 1968
Smolyan Province
Gypsum Selenite Cluster from Tuscany, Italy TF2602 pink opal but gem-quality minerals such asApprox. Dimensions: 8 x 6 x 3 inches Approx. Weight: 1107 grams Locality: Saline Di Volterra, Pisa Province, Tuscany, Italy Saline, the most important town in the municipality of Volterra, owes its name to the salt deposits under the ground and to its long history in the extraction of salt throughout the centuries. This specimen of gypsum selenite was collected from Saline and features grayish opaque crystals with "fishtail" terminations. These