Giant Quartz

   Grizzly Ridge Quartz Ranch is a privately owned organization that specializes in exploring and developing an extraordinary quartz cavern system located in El Dorado County, California. The crystal cavern system is situated in the Melones Fault zone, at the core of California's Mother Lode region, between the Calaveras Terrane and the Shoo Fly Complex.

    As the Earth's continents were forming, the North American Plate was uplifted while the Pacific Plate subducted beneath it.  Geologists have observed that the ultra-basic rocks found in the Melones fault zone have a deep origin, originating from the Earth's upper mantle.  Before becoming a fault zone, the region was an underwater canyon called the Sierran Trench that originated in a prehistoric sea and stretched from northwest to southeast, extending far to the west.  The cracking of terranes led to the formation of quartz crystals in cavernous spaces as pressurized silicate solutions moved upward and cooled.  Scientists have extensively discussed how the cooling rate of quartz crystals affects their shape, size, and mineral inclusions.


These specimens are of Heirloom quality and come with detailed provenance. They are available for private enjoyment or donation placement. The price can be requested.


V Twin

 This natural twin crystal was carefully removed from the fault-line crystal cavern.   Translucent to transparent,  glows beautifully in the sunlight.  The original crystals that make up this specimen were perhaps longer, sheared by activity in the fault zone and re-healed with later-stage solutions.  Measures 28" long by 20" high by 15" wide.  A truly unique specimen from this Historic Site.

One Hundred Two pounds

 This high grade 102 pound quartz crystal is exquisite.  Sheared and re-healed during fault-line activity.

Displayed by twirling on a cloth rope.  This stone will look great displayed in natural light.

Dimensions = 23" x 12" x 10"


Companion Stones

As they were found in the lateritic clay. Complete stones.

Are these the tips of two different crystals split in half during a geological event or one crystal that was split and shifted by super hot solutions?


Giant Quartz
Giant Quartz
Giant Quartz