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  2. Prasiolite - Wikipedia

    en.wikipedia.org/wiki/Prasiolite

    Prasiolite. Prasiolite (also known as green quartz, green amethyst or vermarine) is a green variety of quartz. Since 1950, almost all natural prasiolite has come from a small Brazilian mine, [citation needed] but it has also been mined in the Lower Silesia region of Poland. Naturally occurring prasiolite has also been found in the Thunder Bay ...

  3. Quartz - Wikipedia

    en.wikipedia.org/wiki/Quartz

    Quartz. Quartz is a hard, crystalline mineral composed of silica (silicon dioxide). The atoms are linked in a continuous framework of SiO 4 silicon–oxygen tetrahedra, with each oxygen being shared between two tetrahedra, giving an overall chemical formula of SiO 2. Quartz is, therefore, classified structurally as a framework silicate mineral ...

  4. Crystal skull - Wikipedia

    en.wikipedia.org/wiki/Crystal_skull

    The crystal skull at the British Museum, similar in dimensions to the more detailed Mitchell-Hedges skull. Crystal skulls are human skull hardstone carvings made of clear, milky white or other types of quartz (also called "rock crystal"), claimed to be pre-Columbian Mesoamerican artifacts by their alleged finders; however, these claims have been refuted for all of the specimens made available ...

  5. Smoky quartz - Wikipedia

    en.wikipedia.org/wiki/Smoky_quartz

    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 ...

  6. Opal - Wikipedia

    en.wikipedia.org/wiki/Opal

    Brazilian Precious Opal with patches of brilliant color throughout. The brightness of the fire in opal ranges on a scale of 1 to 5 (with 5 being the brightest) [ 13 ] "Girasol opal" is a term sometimes mistakenly and improperly used to refer to fire opals, as well as a type of transparent to semitransparent type milky quartz from Madagascar ...

  7. Pedra Furada - Wikipedia

    en.wikipedia.org/wiki/Pedra_Furada

    Pedra Furada. Coordinates: 8°50′00″S 42°33′12″W. Stone arch at Pedra Furada. Pedra Furada (Portuguese pronunciation: [ˈpɛdɾɐ fuˈɾadɐ], meaning pierced rock) is an important collection of over 800 archaeological sites in the state of Piauí, Brazil. These include hundreds of rock paintings dating from circa 12,000 years before ...

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