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2. Crystal healing - Wikipedia

   en.wikipedia.org/wiki/Crystal_healing

   The Sumerians purportedly used crystals in their magical formulas 6000 years ago. [8] Ancient Egyptians mined for crystals and used them to make jewelry. Crystals or gemstones were also used in practice, for their metaphysical properties. Specifically, they used crystals as aids for health and protection.

3. Crystal - Wikipedia

   en.wikipedia.org/wiki/Crystal

   A crystal's crystallographic forms are sets of possible faces of the crystal that are related by one of the symmetries of the crystal. For example, crystals of galena often take the shape of cubes, and the six faces of the cube belong to a crystallographic form that displays one of the symmetries of the isometric crystal system. Galena also ...

4. Gemstone - Wikipedia

   en.wikipedia.org/wiki/Gemstone

   Many gems are crystals which are classified by their crystal system such as cubic or trigonal or monoclinic. Another term used is habit, the form the gem is usually found in. [12] For example, diamonds, which have a cubic crystal system, are often found as octahedrons. [13] Gemstones are classified into different groups, species, and varieties.

5. List of gemstones by species - Wikipedia

   en.wikipedia.org/wiki/List_of_gemstones_by_species

   Calcite. Manganoan calcite (var.); Caledonite; Canasite; Cancrinite. Vishnevite; Carletonite; Carnallite; Cassiterite; Catapleiite; Cavansite; Celestite; Ceruleite ...

6. List of minerals - Wikipedia

   en.wikipedia.org/wiki/List_of_minerals

   Minerals are distinguished by various chemical and physical properties. Differences in chemical composition and crystal structure distinguish the various species. Within a mineral species there may be variation in physical properties or minor amounts of impurities that are recognized by mineralogists or wider society as a mineral variety.

7. Luminous gemstones - Wikipedia

   en.wikipedia.org/wiki/Luminous_gemstones

   [citation needed] The Mormon Book of Ether describes "sixteen small stones; and they were white and clear, even as transparent glass", being touched by God's hand so that they might "shine forth in darkness." The Jaredites placed a stone fore and aft on each ship and had "light continually" during their 344-day voyage to America (Ball 1938: 500).