Goldmanite
A variety of Minerals
What is Goldmanite?
Goldmanite is a green or greenish-brown silicate mineral of the garnet group with a chemical formula of Ca3(V3+,Al,Fe3+)2(SiO4)3.
Market Value Factors
Pricing varies for every rock and mineral, so use these universal factors to gauge Goldmanite before comparing listings or appraisals.
Size & Weight
Larger, intact specimens usually command higher prices.
Rarity & Demand
Scarce material or popular varieties sell at a premium.
Condition & Finish
Chips, repairs, and heavy wear lower value; clean prep helps.
Treatment & Provenance
Untreated specimens with documented locality are prized.
Goldmanite Localities Map
See where Goldmanite is found with a localities map, collecting zones, and geology context. Generate a sample map preview below.
Key Characteristics
Characteristics of Goldmanite
The approximate density (3.74±.03) of goldmanite was determined by finding the density of diluted Clerici solution in which small fragments remained suspended. Because of fine grain size, more accurate determination of density was not attempted. The calculated density (3.737) agrees with the approximate value. The index of refraction was found by immersion to be 1.821±.001, using sodium light and adjusting for small temperature changes. Like so many calcium garnets, goldmanite was found to be weakly anisotropic. The cell edge of goldmanite is 12.011 Å, as determined by x-ray powder diffraction analysis.
Formation of Goldmanite
In addition to the type location in the Sandy mine in New Mexico, it has been reported from Coat-an-Noz, Cotes-du-Nord, France; in drill core from the North Sea; from Klatovy, Czech Republic; Ishimskaya Luka, northern Kazakhstan; the Slyudyanka complex, Sayan Mountains, near Lake Baikal region of Russia and the Yamoto mine, Kagoshima Prefecture, Japan. One of the world's biggest goldmanite deposits can be found in the Pezinok District, Slovakia. It is also found in the metalliferious black shales of the Korean Peninsula.
Composition of Goldmanite
Goldmanite is composed of calcium (24.79%), aluminium (3.34%), vanadium (12.6%), iron (2.3%), silicon (17.37%), and oxygen (39.59%). Its chemical formula is Ca3(V3+,Al,Fe3+)2(SiO4)3.
Quick Facts
Physical Properties
- Color
- Green, brownish-green
- Hardness (Mohs)
- 6 - 7
- Streak
- White
Chemical Properties
- Chemical Formula
- Ca3V3+2(SiO4)3
- Elements
- Ca, O, Si, V
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Goldmanite FAQs
How do I identify Goldmanite?
Goldmanite can be identified by its hardness of 6 - 7 on the Mohs scale, Green color. Look for these key characteristics when examining specimens.
What color is Goldmanite?
Goldmanite typically appears in Green, brownish-green. Color can vary depending on impurities and formation conditions.
How hard is Goldmanite?
Goldmanite has a hardness of 6 - 7 on the Mohs scale. This gives it moderate hardness.
What is the characteristics of goldmanite of Goldmanite?
The approximate density (3.74±.03) of goldmanite was determined by finding the density of diluted Clerici solution in which small fragments remained suspended. Because of fine grain size, more accurate determination of density was not attempted. The calculated density (3.737) agrees with the approximate value. The index of refraction was found by immersion to be 1.821±.001, using sodium light and adjusting for small temperature changes. Like so many calcium garnets, goldmanite was found to be weakly anisotropic. The cell edge of goldmanite is 12.011 Å, as determined by x-ray powder diffraction analysis.
What is the formation of goldmanite of Goldmanite?
In addition to the type location in the Sandy mine in New Mexico, it has been reported from Coat-an-Noz, Cotes-du-Nord, France; in drill core from the North Sea; from Klatovy, Czech Republic; Ishimskaya Luka, northern Kazakhstan; the Slyudyanka complex, Sayan Mountains, near Lake Baikal region of Russia and the Yamoto mine, Kagoshima Prefecture, Japan. One of the world's biggest goldmanite deposits can be found in the Pezinok District, Slovakia. It is also found in the metalliferious black shales of the Korean Peninsula.
What is the composition of goldmanite of Goldmanite?
Goldmanite is composed of calcium (24.79%), aluminium (3.34%), vanadium (12.6%), iron (2.3%), silicon (17.37%), and oxygen (39.59%). Its chemical formula is Ca3(V3+,Al,Fe3+)2(SiO4)3.
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