Rock+and+Mineral+Collection

Basalt.RhyoliteGraniteSLATE: Did you know ? 1. Slate can be a pool table.& It last longer too! 2. Most of the world's natural slate-in fact 90 percent-comes from the northern part of Spain. Areas of geology are surveyed, sampled, and tested for the presence of slate, and then the slate is evaluated for quality and purity before it is quarried or mined.

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