Giant Quartz

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

    During the Late Cretaceous period, as the Earth's continents were forming, the Pacific-Farallon Ridge was a spreading ridge that stretched over 10,000 km in length. It separated the Pacific Plate to the west and the Farallon Plate to the east. Geologists have discovered that the ultra-basic rocks present in the Melones fault zone have an origin deep in the Earth's upper mantle. This region was once an underwater canyon known as the Sierran Trench. It originated in a prehistoric sea and extended from northwest to southeast, stretching far to the west. The cracking of terranes caused the formation of quartz crystals in cavernous spaces. As pressurized silicate solutions moved upward and cooled, the crystals took shape. Scientists have extensively studied the cooling rate of quartz crystals and how it affects their shape, size, and mineral inclusions.

Ancient ocean bed plate with quartz and chert.  A rare remnant of the Farallon tectonic plate. 634 pounds.

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?