$450Median
110Sold (12 mo)
$225Last sale
Updated 4d ago
Andradite
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Lustrous green translucent crystals of andradite, this the variety known as demantoid, measuring to 0.9 cm in size across the top of matrix. The matrix is mostly covered with tiny crystals of andradite. There are maybe seven good large crystals present. In good condition. The specimen comes with a previous label from the collection of Ray DeMark.Demantoid, a green variety of andradite garnet, is found in the serpentinite and ultramafic rock environments of the New Idria district in San Benito County, California, particularly near Santa Rita Peak. Geologically, these green garnets form through hydrothermal alteration and serpentinization within regional ophiolite complexes. Historically, while San Benito County is most famous for benitoite, the rare demantoid occurrences have long attracted mineral collectors and small-scale prospectors who recover small, vibrant green crystals from veins and weathered rock, contributing a unique chapter to the region's mining heritage.
Product details
SpeciesAndradite
SizeSmall Cabinet
Dimensions9.5 x 5.0 x 3.5 cm
Added on10/04/2026
LocalityUSA, California, San Benito County
Current owner
Unknown Owner
- Acquired
- Oct 2026
- Price paid
- $225.00
Previous owners
| Date | Collector | Acquisition price |
|---|---|---|
| — | Weinrich Minerals | Not disclosed |
Learn more
Mineral guide
Learn about Andradite
vivid demantoid greens, topazolite yellows, and melanite blacks; sharp, fire-filled crystals with skarn associations and strong collecting value.Regional guide
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