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  2. Quartz - Wikipedia

    en.wikipedia.org/wiki/Quartz

    Quartz is the mineral defining the value of 7 on the Mohs scale of hardness, ... Rose quartz is a type of quartz that exhibits a pale pink to rose red hue.

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

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

    Rose quartz (1966) Fairburn agate (1966) and State Jewelry: Black Hills Gold: Tennessee [66] Agate (2009) Limestone (from 1979 to present) and formerly.

  4. Gemstone - Wikipedia

    en.wikipedia.org/wiki/Gemstone

    Gemstone. Group of precious and semiprecious stones—both uncut and faceted—including (clockwise from top left) diamond, uncut synthetic sapphire, ruby, uncut emerald, and amethyst crystal cluster. A gemstone (also called a fine gem, jewel, precious stone, semiprecious stone, or simply gem) is a piece of mineral crystal which, when cut or ...

  5. Amethyst - Wikipedia

    en.wikipedia.org/wiki/Amethyst

    Amethyst is a purple variety of quartz (SiO. 2) and owes its violet color to irradiation, impurities of iron (Fe3+. ) and in some cases other transition metals, and the presence of other trace elements, which result in complex crystal lattice substitutions. [2][3][4] The irradiation causes the iron Fe3+.

  6. Crystal healing - Wikipedia

    en.wikipedia.org/wiki/Crystal_healing

    Crystal healing is a pseudoscientific alternative-medicine practice that uses semiprecious stones and crystals such as quartz, agate, amethyst or opal. Adherents of the practice claim that these have healing powers, but there is no scientific basis for this claim. [1][2][3] Practitioners of crystal healing believe they can boost low energy ...

  7. Jewellery - Wikipedia

    en.wikipedia.org/wiki/Jewellery

    Quartz Quartz refers to a family of crystalline gemstones of various colours and sizes. Among the well-known types of quartz are rose quartz (which has a delicate pink colour), and smoky quartz (which comes in a variety of shades of translucent brown). Some other gemstones, such as Amethyst and Citrine, are also part of the quartz family.

  8. Rhodochrosite - Wikipedia

    en.wikipedia.org/wiki/Rhodochrosite

    Rhodochrosite is a manganese carbonate mineral with chemical composition MnCO 3. In its pure form (rare), it is typically a rose-red colour, [5] but it can also be shades of pink to pale brown. It streaks white, [6] and its Mohs hardness varies between 3.5 and 4.5. Its specific gravity is between 3.45 and 3.6. [7]

  9. List of gemstones by species - Wikipedia

    en.wikipedia.org/wiki/List_of_gemstones_by_species

    Rose quartz (var.) Rock crystal (var.) Shocked quartz (var.) Smoky quartz ... Metal-coated crystals hyped as rainbow quartz; Lab spinel; Synthetic turquoise; Terbium ...

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