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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 8 ·4H 2 O.It is rare and valuable in finer grades and has been prized as a gemstone for millennia due to its hue.

  3. Luminous gemstones - Wikipedia

    en.wikipedia.org/wiki/Luminous_gemstones

    The first involves a black crane; according to legend, when a crane has lived a thousand years it turns blue; after another thousand it becomes black and is called a xuanhe (玄鶴. "dark crane"). Kuai Shen [噲參] was the most filial son to his mother. Once a black crane was injured by a bow hunter and in its extremity, went to Kuai.

  4. Lapis lazuli - Wikipedia

    en.wikipedia.org/wiki/Lapis_Lazuli

    Lapis lazuli (UK: / ˌ l æ p ɪ s ˈ l æ z (j) ʊ l i, ˈ l æ ʒ ʊ-,-ˌ l i /; US: / ˈ l æ z (j) ə l i, ˈ l æ ʒ ə-,-ˌ l i /), or lapis for short, is a deep-blue metamorphic rock used as a semi-precious stone that has been prized since antiquity for its intense color.

  5. Celestine (mineral) - Wikipedia

    en.wikipedia.org/wiki/Celestine_(mineral)

    Celestine (the IMA-accepted name) [6] or celestite [1] [7] [a] is a mineral consisting of strontium sulfate (Sr S O 4).The mineral is named for its occasional delicate blue color. ...

  6. Azure (heraldry) - Wikipedia

    en.wikipedia.org/wiki/Azure_(heraldry)

    A wide range of colour values is used in the depiction of azure in armory and flags, but in common usage it is often referred to simply as "blue". In addition to the standard blue tincture called azure, there is a lighter blue that is called bleu celeste or "sky blue". Neither azure nor bleu celeste is precisely defined as a particular shade of ...

  7. Bleu celeste - Wikipedia

    en.wikipedia.org/wiki/Bleu_celeste

    Blue celeste tincture. Bleu celeste (/ ˌ b l uː s ə ˈ l ɛ s t /, "sky blue") is a rarely occurring and non-standard tincture in heraldry (not being one of the seven main colours or metals or the three staynard colours). This tincture is sometimes also called ciel or simply celeste.

  8. Asterism (gemology) - Wikipedia

    en.wikipedia.org/wiki/Asterism_(gemology)

    Asterism on the surface of a blue star sapphire. A purple-pink star sapphire displaying asterism in a platinum ring.. An asterism (from Ancient Greek ἀστήρ (astḗr) 'star' and -ism) is a star-shaped concentration of light reflected or refracted from a gemstone.

  9. Quartz - Wikipedia

    en.wikipedia.org/wiki/Quartz

    Quartz is, therefore, classified structurally as a framework silicate mineral and compositionally as an oxide mineral. Quartz is the second most abundant mineral in Earth's continental crust, behind feldspar. [10] Quartz exists in two forms, the normal α-quartz and the high-temperature β-quartz, both of which are chiral. The transformation ...