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2. Baraboo Quartzite - Wikipedia

   en.wikipedia.org/wiki/Baraboo_Quartzite

   While pure quartzite is usually white or gray, Baraboo Quartzite is typically dark purple to maroon in color, due to the presence of iron and other impurities. [2] Baraboo Quartzite may display strata created by progressive deposition of layers of sand in the original sandstone from which the quartzite was formed (through metamorphism ). [ 2 ]

3. Aventurine - Wikipedia

   en.wikipedia.org/wiki/Aventurine

   Although it was known first, goldstone is now a common imitation of aventurine and sunstone. Goldstone is distinguished visually from the latter two minerals by its coarse flecks of copper, dispersed within the glass in an unnaturally uniform manner. It is usually a golden brown, but may also be found in blue or green.

4. Eclogite - Wikipedia

   en.wikipedia.org/wiki/Eclogite

   A few gold-white phengite patches can be seen at the top. A 23 millimetres (0.91 in) coin added for scale. A 23 millimetres (0.91 in) coin added for scale. Eclogite ( / ˈ ɛ k l ə dʒ aɪ t / ) is a metamorphic rock containing garnet ( almandine - pyrope ) hosted in a matrix of sodium -rich pyroxene ( omphacite ).

5. Gold Hill (Nevada County, California) - Wikipedia

   en.wikipedia.org/wiki/Gold_Hill_(Nevada_County...

   Gold Hill in Grass Valley, California, was the site of one of the first discoveries of quartz gold [2] in California. While quartz gold was also found in other areas of Nevada County, California during the same time, it is this find near Wolf Creek that led to quartz-mining frenzy and subsequent creation of the Gold Country quartz-mining industry.

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7. Goldstone (glass) - Wikipedia

   en.wikipedia.org/wiki/Goldstone_(glass)

   Goldstone Goldstone glass under magnification. Goldstone is a type of glittering glass made in a low-oxygen reducing atmosphere.The finished product can take a smooth polish and be carved into beads, figurines, or other artifacts suitable for semiprecious stone, and in fact goldstone is often mistaken for or misrepresented as a natural material.