is a deep-blue metamorphic rock used as a semi-precious stone that has been prized since antiquity for its intense color

Dimensions: 171x82x89 mm / 6

Specimen Size:  Miniature Sized

Approx Weight (per piece):  25

Size: 12x10mm

Quartz and Galena Crystal Cluster | 59 grams | Mogila, Madan, Bulgaria Volcanic Olivine is a deep-blue metamorphic rockThe LeadZinc deposits of Madan Ore Field (Southwest Rhodopy Mountains) were operated by the Turks in the Middle Ages. Greek coins from Tassos island dating from 14th century AD, have been found in the ancient galleries. As well, the name of the Madan field, which in Turkish means Ore, originates from that time. The Madan Ore Field is built up mainly of the highly crystalline rocks of the lower (Ar) and upper (Pt) metamorphic units which form the Madan