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  2. National Register of Historic Places listings in California

    en.wikipedia.org/wiki/National_Register_of...

    The following are approximate tallies of current listings in California on the National Register of Historic Places. These counts are based on entries in the National Register Information Database as of April 24, 2008, [1] and new weekly listings posted since then on the National Register of Historic Places web site. [2]

  3. Tourmaline - Wikipedia

    en.wikipedia.org/wiki/Tourmaline

    California became a large producer of tourmaline in the early 1900s. The Maine deposits tend to produce crystals in raspberry pink-red as well as minty greens. The California deposits are known for bright pinks, as well as bicolors. During the early 1900s, Maine and California were the world's largest producers of gem tourmalines.

  4. Pegmatite - Wikipedia

    en.wikipedia.org/wiki/Pegmatite

    Pegmatite with blue corundum crystals Pegmatite containing lepidolite, tourmaline, and quartz from the White Elephant Mine in the Black Hills, South Dakota Proterozoic pegmatite swarm in the headwall of the cirque of a small mountain glacier, northeastern Baffin Island, Nunavut

  5. Placer deposit - Wikipedia

    en.wikipedia.org/wiki/Placer_deposit

    Placer minerals are defined as having a specific gravity above 2.58. [1] The separation of the valuable minerals from the most common non-economic mineral, quartz, depends on the difference in specific gravity / density.The weathering process allows for the accumulation of placer minerals, while less dense material such as quartz are swept away.

  6. Why are some of Southern California's most expensive ... - AOL

    www.aol.com/news/why-southern-californias-most...

    Over the last century, Southern California has seen its rich, jagged landscape jam-packed with houses wherever they can fit. Homes hang from the sides of canyons with cantilevered pools suspended ...

  7. List of mines in California - Wikipedia

    en.wikipedia.org/wiki/List_of_mines_in_California

    registered as California Historical Landmark #786. Golden Fleece Tunnel 39°11′09″N 120°37′02″W  /  39.185735°N 120.617152°W  / 39.185735; -120.

  8. 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.

  9. Pala, California - Wikipedia

    en.wikipedia.org/wiki/Pala,_California

    Gem mines in the Pala District still produce tourmaline, with the pink variety as the regional specialty. China’s Empress Dowager Cixi (1860-1908) was said to have valued the pink tourmaline of Pala to be used for carving buttons and other fashion accessories which fueled a boom for pink tourmaline lasting from about 1901–1911. [4]

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