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  2. Smoky quartz - Wikipedia

    en.wikipedia.org/wiki/Smoky_quartz

    Smoky quartz is a brownish grey, translucent variety of quartz that ranges in clarity from almost complete transparency to an almost-opaque brownish-gray or black crystals. [6] The color of smoky quartz is produced when natural radiation, emitted from the surrounding rock, activates color centers around aluminum impurities within the ...

  3. 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 ...

  4. List of minerals by optical properties - Wikipedia

    en.wikipedia.org/wiki/List_of_minerals_by...

    Optical properties of common minerals Name Crystal system Indicatrix Optical sign Birefringence Color in plain polars Anorthite: Triclinic: Biaxial (-) 0.013

  5. 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.

  6. 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.

  7. Crystal habit - Wikipedia

    en.wikipedia.org/wiki/Crystal_habit

    Smoky quartz with spessartine on top of feldspar matrix, featuring different crystal habits (shapes). In mineralogy, crystal habit is the characteristic external shape of an individual crystal or aggregate of crystals.

  8. Luminous gemstones - Wikipedia

    en.wikipedia.org/wiki/Luminous_gemstones

    Thermoluminescence from heating chlorophane specimens on a hotplate. Triboluminescence from rubbing together two quartz crystals.. First, it will be useful to introduce some mineralogical terminology for gemstones that can glow when exposed to light, friction, or heat.

  9. Tourmaline - Wikipedia

    en.wikipedia.org/wiki/Tourmaline

    Tri-chromatic elbaite crystals on quartz, Himalaya Mine, San Diego Co., California, US. Tourmaline is a six-member ring cyclosilicate having a trigonal crystal system. It occurs as long, slender to thick prismatic and columnar crystals that are usually triangular in cross-section, often with curved striated faces. The style of termination at ...

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