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  2. 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+.

  3. Herkimer diamond - Wikipedia

    en.wikipedia.org/wiki/Herkimer_diamond

    Herkimer diamonds are double-terminated quartz crystals discovered within exposed outcrops of dolomite in and around Herkimer County, New York, and the Mohawk River Valley in the US. [1][2] They are not diamonds; the "diamond" in their name is due to both their clarity and well formed faces. Because the first discovery sites were in the village ...

  4. Quartz - Wikipedia

    en.wikipedia.org/wiki/Quartz

    A synthetic quartz crystal grown by the hydrothermal method, about 19 centimetres (7.5 in) long and weighing about 127 grams (4.5 oz) Not all varieties of quartz are naturally occurring. Some clear quartz crystals can be treated using heat or gamma-irradiation to induce color where it would not otherwise have occurred naturally. Susceptibility ...

  5. Durr Al Najaf - Wikipedia

    en.wikipedia.org/wiki/Durr_Al_Najaf

    Durr Al Najaf (Arabic: دُر ٱلنَّجَف) is a glossy and clear gemstone from the quartz family. The name means "pearl of Najaf " as it can only be sourced from Wadi-al-Salaam (Arabic: وادي السلام, romanized: Wādī al-Salām, lit. 'Valley of Peace') in Najaf, Iraq. The gemstone is found along the west of Najaf close by the ...

  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. Agate - Wikipedia

    en.wikipedia.org/wiki/Agate

    It has been suggested that growth is not crystallographically controlled but is due to the filling-in of spaces between pre-existing crystals which have since dissolved. Iris agate is a finely-banded and usually colorless agate, that when thinly sliced, exhibits spectral decomposition of white light into its constituent colors, requiring 400 to ...

  8. Gemstone irradiation - Wikipedia

    en.wikipedia.org/wiki/Gemstone_irradiation

    Gemstone irradiation. Gemstone irradiation is a process in which a gemstone is artificially irradiated in order to enhance its optical properties. High levels of ionizing radiation can change the atomic structure of the gemstone's crystal lattice, which in turn alters the optical properties within it. [1] As a result, the gem­stone's color may ...

  9. Spatika Lingam - Wikipedia

    en.wikipedia.org/wiki/Spatika_Lingam

    High quality quartz crystals are single-crystal silica with optical or electronic properties that make them suitable for hardstone carvings. The Hindu temples in South India use this semi-precious mineral for making Shiva Lingams. Sphatikam beads are made from translucent rose quartz are cut and polished as beads.

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