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  2. Tourmaline - Wikipedia

    en.wikipedia.org/wiki/Tourmaline

    Today this tourmaline locality (type locality for dravite) at Dobrova (near Dravograd), is a part of the Republic of Slovenia. [9] Tschermak gave this tourmaline the name dravite, for the Drava river area, which is the district along the Drava River (in German: Drau, in Latin: Drave) in Austria and Slovenia.

  3. Tourmaline Oil - Wikipedia

    en.wikipedia.org/wiki/Tourmaline_Oil

    Tourmaline Oil is a Canadian energy company engaged in the exploration, development, and extraction of crude oil and natural gas. It is headquartered in Calgary , Alberta in Canada. A major natural gas producer, it became the largest natural gas producer in Canada in 2021.

  4. Opal - Wikipedia

    en.wikipedia.org/wiki/Opal

    A Peruvian opal (also called blue opal) is a semi-opaque to opaque blue-green stone found in Peru, which is often cut to include the matrix in the more opaque stones. It does not display a play of color. Blue opal also comes from Oregon and Idaho in the Owyhee region, as well as from Nevada around the Virgin Valley. [17] Opal is also formed by ...

  5. Gemstone - Wikipedia

    en.wikipedia.org/wiki/Gemstone

    Paraiba Tourmaline has become one of the most popular gemstones in recent times thanks to its color and is considered to be one of the important gemstones after rubies, emeralds, and sapphires according to Gübelin Gemlab. Even though it is a tourmaline, Paraiba Tourmaline is one of the most expensive gemstones. [31]

  6. Optical mineralogy - Wikipedia

    en.wikipedia.org/wiki/Optical_mineralogy

    Some minerals are colorless and transparent (quartz, calcite, feldspar, muscovite, etc.), while others are yellow or brown (rutile, tourmaline, biotite), green (diopside, hornblende, chlorite), blue (glaucophane). Many minerals may present a variety of colors, in the same or different rocks, or even multiple colours in a single mineral specimen ...

  7. List of minerals - Wikipedia

    en.wikipedia.org/wiki/List_of_minerals

    Amethyst crystals – a purple quartz Apophyllite crystals sitting right beside a cluster of peachy bowtie stilbite Aquamarine variety of beryl with tourmaline on orthoclase Arsenopyrite from Hidalgo del Parral, Chihuahua, Mexico Aurichalcite needles spraying out within a protected pocket lined by bladed calcite crystals Austinite from the Ojuela Mine, Mapimí, Durango, Mexico Ametrine ...

  8. Taaffeite - Wikipedia

    en.wikipedia.org/wiki/Taaffeite

    Taaffeite (/ ˈ t ɑː f aɪ t /; BeMgAl 4 O 8) is a mineral, named after its discoverer Richard Taaffe (1898–1967) who found the first sample, a cut and polished gem, in October 1945 in a jeweler's shop in Dublin, Ireland.

  9. Opalescence - Wikipedia

    en.wikipedia.org/wiki/Opalescence

    Each of the three notable types of opal – precious, common, and fire [3] – display different optical effects; therefore, the intended meaning varies depending on context. The general definition of opalescence is a milky iridescence displayed by an opal, which describes the visual effect of precious opal very well, and opalescence is ...

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