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Geological Period
This collection is the continuation of the Premium Collection of metallic ores
) y se extinguieron en el tardío periodo pérmico (hace 240 m
¡Una colección auténtica con piezas de calidad
Prehnita - Mali
Obsidiana Negra XL Pez fósil Geological PeriodRock Class igneous rock Rock Subclass Volcanic (volcanic glass) Origin Hidalgo, Mexico Size Medium: 3. 00 4. 00 cm Large: 4. 00 5. 00 cm Obsidian, or volcanic glass, is molten lava that has cooled rapidly. Its composition is mainly of silicic oxides, being very similar to that of granite or rhyolite. The piece you receive may differ slightly from the photo shown as the rocks are natural and no piece is identical. The size is approximate.
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