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  2. Apatite - Wikipedia

    en.wikipedia.org/wiki/Apatite

    Apatite is infrequently used as a gemstone. Transparent stones of clean color have been faceted, and chatoyant specimens have been cabochon-cut. [3] Chatoyant stones are known as cat's-eye apatite, [3] transparent green stones are known as asparagus stone, [3] and blue stones have been called moroxite. [35]

  3. Hydroxyapatite - Wikipedia

    en.wikipedia.org/wiki/Hydroxyapatite

    Hydroxyapatite (IMA name: hydroxylapatite [5]) (Hap, HAp, or HA) is a naturally occurring mineral form of calcium apatite with the formula Ca 5 (PO 4) 3 (OH), often written Ca 10 (PO 4) 6 (OH) 2 to denote that the crystal unit cell comprises two entities. [6] It is the hydroxyl endmember of the complex apatite group.

  4. Agate - Wikipedia

    en.wikipedia.org/wiki/Agate

    Agate (/ ˈ æ ɡ ɪ t / AG-it) is a fibrous, banded variety of chalcedony. [1] Agate stones are characterized by alternating bands of different colored chalcedony and sometimes include macroscopic quartz.

  5. Gemstone - Wikipedia

    en.wikipedia.org/wiki/Gemstone

    Whether a gemstone is a natural stone or synthetic, the chemical, physical, and optical characteristics are the same: They are composed of the same mineral and are colored by the same trace materials, have the same hardness and density and strength, and show the same color spectrum, refractive index, and birefringence (if any). Lab-created ...

  6. List of gemstones by species - Wikipedia

    en.wikipedia.org/wiki/List_of_gemstones_by_species

    Gadolinite; Gahnite; Gahnospinel; Garnet group: Pyralspite. Almandine; Pyrope; Spessartine; Ugrandite. Andradite. Demantoid; Melanite; Topazolite; Grossular ...

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