Bead Size: 6x5 to 9x6 mm

Approx Weight (per piece):  25

Dimensions: 171x82x89 mm / 6

Volcanic bombs are large clots of lava that are ejected from a volcano during an explosive eruption

large cluster of Okenite with Gyrolite

Quartz and Galena Crystal Cluster | 59 grams | Mogila, Madan, Bulgaria Volcanic Olivine Bead Size: 6x5 to 9x6The 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