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2. 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 ).

3. Mohawkite - Wikipedia

   en.wikipedia.org/wiki/Mohawkite

   Mohawkite is a rare rock consisting of mixtures of arsenic, silver, nickel, skutterudite and copper, with the formula Cu 3 As up to Cu 6 As, and the most desirable material was usually found in white quartz matrix. [1] It has a hardness of 3–3.5 and a metallic luster. [2] It is named after the Mohawk Mine, where it was originally found.

4. 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.

5. Sunstone - Wikipedia

   en.wikipedia.org/wiki/Sunstone

   ] Previously the best-known locality being Tvedestrand, near Arendal, in south Norway, where masses of the sunstone occur embedded in a vein of quartz running through gneiss. Other locations include near Lake Baikal in Siberia , and several United States localities—notably at Middletown Township, Delaware County, Pennsylvania ; Plush, Oregon ...

6. 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.

7. Orogenic gold deposit - Wikipedia

   en.wikipedia.org/wiki/Orogenic_gold_deposit

   Hydrothermal gold in quartz (white mineral) vein with other gangue minerals (black minerals). Geochemical studies on gold bearing quartz-carbonate veins are important to determine temperature, pressure, at which the veins were generated, and the chemical signature of fluids.