Leopardskin: The name of this
unusual looking mineral is “leopardskin” because of its spotted
appearance; however, the true name of this mineral is Orbicular Rhyolite.
Orbicular Rhyolite is an igneous rock that was formed by lava flows on the
earth’s surface. The spots, or “orbs,” in this mineral probably occurred
when molten lava reacted with fragments of rock known as xenoliths.
Rhyolites are extremely fine grained. This makes their mineral composition
hard to identify except by sophisticated chemical techniques. The main
constituents of rhyolite are quartz and feldspar. Origin: Mexico
7981 Town Hall Road NW, Post
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