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with dimensions of 45x41x25 mm
top and back are covered with many sharp lustrous black tourmaline crystals that are in very good condition
Nestled in a matrix of ivory colored calcite
Its dimensions are 77x62x28mm
Microcline is one of the most common feldspar minerals
Obsidian Sphere | Classic Natural Black Crystal | Huge 116mm, 4.57 in | 2.186 kg LL4 with dimensions of 45x41x25 mmObsidian is a naturally occurring volcanic glass formed when lava extruded from a volcano cools rapidly with minimal crystal growth. Pure obsidian is usually dark in appearance, though the color varies depending on the impurities present. Iron and other transition elements may give the obsidian a dark brown to black color. Most black obsidians contain nano inclusions of magnetite, an iron oxide. Very few samples of obsidian are nearly colorless. In
