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Obsidian is produced when felsic lava extruded from a volcano cools rapidly with minimal crystal growth
This specimen measures approximately 6
The Pennsylvanian period also known as the Late Carboniferous period is the younger of two sub periods of the Carboniferous Period
The amethyst teardrop stone is about
Dogtooth Calcite Druzy Crystal Cluster Santa Eulalia Chihuahua, Mexico Greem Tourmaline Obsidian is produced when felsicBeautiful Dogtooth Calcite Druzy Cluster is a dense clusters of grayish brown opaque, dogtooth crystals. Dogtooth Calcite Druzy Clusters are calcite, or calcium carbonate. Tight clusters of well developed calcite druzy scalenohedrons coat the top of a dark brown matrix of hematite. These crystal formations with their long, sharp terminations resembling shape of dog's teeth are what give the crystal its name . These specimens come from Santa Eulalia
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