This Old Rock is named for our ancient Grinding Rock of white crystalline quartz, with deep mortar holes on it.
If you are visiting the California State Mining and Mineral Museum in Mariposa,
look for two specimens from This Old Rock on display.
This beautiful quartz crystal Plate is the largest ever extracted from the State of California..
Click on Photo to link to page with Close-ups of "Old Growth" and "New growth" crystals.
This magnificent crystal, Cluster One, was the first giant quartz crystal we discovered in this ancient Indian quarry.
Click on Photo to link to page about how this stone was extracted, and see "The Sword in the Stone."
Giant Spike is the largest point we have found so far.
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Click on Photo to link to page showing how we extract specimens without damage.
Cluster Two was beside Giant Spike along the crystal cavern wall.
The museum grade specimens above are four of the largest Quartz Crystal conglomerates ever documented from the West Coast of North America.