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Near a location that cinnabar was found.
CINNABAR, sometimes written cinnabarite, a name applied to red mercuric sulphide (HgS), or native vermilion, the common ore of mercury. Cinnabar is found in localities which yield quicksilver, such as New Almaden (California). Native Americans in this area used cinnabar to paint their bodies red for ceremonial purposes.
In 1845, Andres Castillero, a native of Spain and a captain in the Mexican military, visited Alta California and became interested in the red rock he saw at the Mission Santa Clara. Castillero was trained in geology, chemistry, and metallurgy. He was also familiar with the quicksilver mines of La Mancha, Spain. Castillero experimented with the red rock. He fired and roasted samples of it, and concluded the roasted rock was cinnabar, the bearer of mercury.
Now you can come out and see this historic location where the cinnabar was mined and processed. What you are looking for is not cinnabar. It is sign only. Bring your own pen.
Qba'g tb bhgfvqr gur fdhner.
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Coordinates are in the WGS84 datum