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  2. Turquoise - Wikipedia

    en.wikipedia.org/wiki/Turquoise

    Turquoise is an opaque, blue-to-green mineral that is a hydrous phosphate of copper and aluminium, with the chemical formula Cu Al 6( PO 4)4( OH)8·4 H 2 O. It is rare and valuable in finer grades and has been prized as a gemstone for millennia due to its hue.

  3. Turquoise (color) - Wikipedia

    en.wikipedia.org/wiki/Turquoise_(color)

    Turquoise is an opaque, blue-to-green mineral that is a hydrous phosphate of copper and aluminium, with the chemical formula Cu Al 6 ( P O 4) 4 (O H) 8· 4 H 2 O. It is rare and valuable in finer grades and has been prized as a gem and ornamental stone for thousands of years owing to its unique hue. A turquoise dome of the Po-i-Kalyan Mosque in ...

  4. Gemstone - Wikipedia

    en.wikipedia.org/wiki/Gemstone

    Characteristics and classification. A collection of gemstone pebbles made by tumbling the rough stones, except the ruby and tourmaline, with abrasive grit inside a rotating barrel. The largest pebble here is 40 mm (1.6 in) long. The traditional classification in the West, which goes back to the ancient Greeks, begins with a distinction between ...

  5. List of U.S. state minerals, rocks, stones and gemstones

    en.wikipedia.org/wiki/List_of_U.S._state...

    Gemstone Alabama: Hematite (1967) Marble (1969) Star blue quartz (1990) Alaska: Gold (1968) Nephrite jade (1968) Arizona: Wulfenite (2017) Turquoise (1974) Arkansas: Quartz (1967) Bauxite (1967) Diamond (1967) California: Gold (1965); California's nickname is the Golden State: Serpentinite (1965) Benitoite (1985) Colorado

  6. Larimar - Wikipedia

    en.wikipedia.org/wiki/Larimar

    Its coloration varies from bluish white, light-blue, light-green, green-blue, turquoise blue, turquoise green, turquoise blue-green, deep green, dark green, to deep blue, dark blue and purple, violet and indigo and the larimar can come in many varieties and color mixes.

  7. List of gemstones by species - Wikipedia

    en.wikipedia.org/wiki/List_of_gemstones_by_species

    This is a list of gemstones, organized by species and types. Minerals There ... Synthetic turquoise; Terbium gallium garnet; Trinitite; Yttrium aluminium garnet;