Rutilated Quartz Crystal - a mineral formation formed inside of the Earth
The minerals shown on this page are igneous rocks formed inside the Earth where slower cooling of magma produces visible crystals.
Apophyllite Crystal - the cubic shape is only one of the many crystal shapes for this mineral formation.
Blue Lace Agate - an example of chalcedony - a microcrystalline quartz formed inside the Earth.
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