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  2. Luminous gemstones - Wikipedia

    en.wikipedia.org/wiki/Luminous_gemstones

    "From this stone flashes a great light in the night-time, so that the whole temple gleams brightly as by the light of myriads of candles, but in the daytime the brightness grows faint; the gem has the likeness of a bright fire" (tr. Strong and Garstang 1913: 72).

  3. Carbuncle (gemstone) - Wikipedia

    en.wikipedia.org/wiki/Carbuncle_(gemstone)

    A polished almandine stone . Carbuncle (/ ˈ k ɑːr b ʌ ŋ k əl /) is another name for a deep red almandine gemstone that has been cut with a smooth, convex face in a method called cabochon. [1] Traditionally, the term referred to any red gemstone, most often a red garnet. [2] Carbuncles and their chimeras have spanned three millennia.

  4. Asterism (gemology) - Wikipedia

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

    An asterism (from Ancient Greek ἀστήρ (astḗr) 'star' and -ism) is a star-shaped concentration of light reflected or refracted from a gemstone. It can appear when a suitable stone is cut en cabochon (i.e. shaped and polished, not faceted). A gemstone that exhibits this effect is called a star stone or asteria.

  5. List of gemstones by species - Wikipedia

    en.wikipedia.org/wiki/List_of_gemstones_by_species

    Eilat stone; Epidosite; Glimmerite; Goldstone (glittering glass) Tiger's eye; Helenite (artificial glass made from volcanic ash) Iddingsite; Kimberlite; Lamproite; Lapis lazuli; Libyan desert glass; Llanite; Maw sit sit; Moldavite; Obsidian; Apache tears; Pallasite; Peridotite (also known as olivinite) Siilinjärvi carbonatite; Soapstone (also ...

  6. Chalcedony - Wikipedia

    en.wikipedia.org/wiki/Chalcedony

    Fire agate shows iridescent phenomena on a brown background; iris agate shows exceptional iridescence when light (especially pinpointed light) is shone through the stone. Landscape agate is chalcedony with a number of different mineral impurities making the stone resemble landscapes.

  7. List of decorative stones - Wikipedia

    en.wikipedia.org/wiki/List_of_decorative_stones

    Natural stone is used as architectural stone (construction, flooring, cladding, counter tops, curbing, etc.) and as raw block and monument stone for the funerary trade. Natural stone is also used in custom stone engraving. The engraved stone can be either decorative or functional. Natural memorial stones are used as natural burial markers.

  8. Ulexite - Wikipedia

    en.wikipedia.org/wiki/Ulexite

    Ulexite (/ juː ˈ l ɛ k s aɪ t /) sometimes called TV rock or TV stone due to its unusual optical properties, is a hydrous borate hydroxide of sodium and calcium with the chemical formula NaCaB 5 O 6 (OH) 6 ·5H 2 O. The mineral occurs as silky white rounded crystalline masses or in parallel fibers.

  9. Peridot - Wikipedia

    en.wikipedia.org/wiki/Peridot

    The visible-light spectroscopy of the same Chinese peridot samples showed light bands between 493.0–481.0 nm, the strongest absorption at 492.0 nm. [ 14 ] The largest cut peridot olivine is a 310- carat (62-gram) specimen in the gem collection of the Smithsonian Museum in Washington, D.C.

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