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igneous rock with high silica content
Smoky Quartz
5-6 medium ranging 18-25mm
It has a hardness of 8 on the Mohs hardness scale
Malachite 7x9-8x10mm Pebble - 15-16-Inch Green Garnet igneous rock with high silicaMalachite is a copper carbonate with a bright green color and dark green banding. Usually found near copper deposits, it is formed through the combination of carbonated water, limestone and copper. Famous malachite mines in the Ural mountains of Russia once produced 20 to ton blocks of the stone, while today it is primarily mined in Africa. Malachite was used extensively as decoration in the palaces of Russian tsars and forms the columns of St. Isaacs