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  2. Interference colour chart - Wikipedia

    en.wikipedia.org/wiki/Interference_colour_chart

    Interference colour chart. In optical mineralogy, an interference colour chart, also known as the Michel-Levy chart, is a tool first developed by Auguste Michel-Lévy to identify minerals in thin section using a petrographic microscope. With a known thickness of the thin section, minerals have specific and predictable colours in cross ...

  3. Citrine (colour) - Wikipedia

    en.wikipedia.org/wiki/Citrine_(colour)

    ISCC–NBS descriptor. Vivid greenish yellow. B: Normalized to [0–255] (byte) Citrine / ˈsɪtriːn / is a colour, the most common reference for which is certain coloured varieties of quartz which are a medium deep shade of golden yellow. Citrine has been summarized at various times as yellow, greenish -yellow, brownish yellow or orange.

  4. Quartz - Wikipedia

    en.wikipedia.org/wiki/Quartz

    Quartz. Quartz is a hard, crystalline mineral composed of silica (silicon dioxide). The atoms are linked in a continuous framework of SiO 4 silicon–oxygen tetrahedra, with each oxygen being shared between two tetrahedra, giving an overall chemical formula of SiO 2. Quartz is, therefore, classified structurally as a framework silicate mineral ...

  5. Peridot - Wikipedia

    en.wikipedia.org/wiki/Peridot

    Peridot. Peridot (/ ˈpɛrɪˌdɒt, - ˌdoʊ / PERR-ih-dot, -⁠⁠doh), sometimes called chrysolite, is a yellow-green transparent variety of olivine. Peridot is one of the few gemstones that occur in only one color. Peridot can be found in mafic and ultramafic rocks occurring in lava and peridotite xenoliths of the mantle.

  6. Garnet - Wikipedia

    en.wikipedia.org/wiki/Garnet

    Other varieties of color-changing garnets exist. In daylight, their color ranges from shades of green, beige, brown, gray, and blue, but in incandescent light, they appear a reddish or purplish/pink color. [25] This is the rarest type of garnet. Because of its color-changing quality, this kind of garnet resembles alexandrite. [26]

  7. Diamond color - Wikipedia

    en.wikipedia.org/wiki/Diamond_color

    Diamonds occur in a variety of colors—steel gray, white, blue, yellow, orange, red, green, pink to purple, brown, and black. [2][3] Colored diamonds contain interstitial impurities or structural defects that cause the coloration; pure diamonds are perfectly transparent and colorless.

  8. Tourmaline - Wikipedia

    en.wikipedia.org/wiki/Tourmaline

    Rarely, it can be found as neon green or electric blue. Tourmaline (/ ˈtʊərməlɪn, - ˌliːn / TOOR-mə-lin, -⁠leen) is a crystalline silicate mineral group in which boron is compounded with elements such as aluminium, iron, magnesium, sodium, lithium, or potassium. This gemstone comes in a wide variety of colors.

  9. 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 ...

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