Phantom crystal

Phantom quartz is a variety of quartz, or "rock crystal", that, over the course of millions of years, forms over earlier rock crystals that already existed. It takes its name from the particular structure of its crystallization: each crystal displays the outlines of numerous smallers crystals, knowns as phantoms. It is found in Austria, Brazil, Madagascar, Switzerland, and the United States.

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Like regular quartz, the chemical composition of phantom quartz is SiO₂, and its hardess is 7.^[1] The available forms of phantom quartz are crystal groups, single crystals, crystal points, touchstone, tumbled stones; as a jewerly gemstone, unsually found in the form of as pendant. The crystallization is a trigonal crystal.

References

See also

• Pseudomorph