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.

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.

Goldmanite Market Value Calculator

Estimate the market value of Goldmanite using size, quality, and finish. This preview calculator is for quick context and is not a formal appraisal.

Goldmanite Localities Map

See where Goldmanite is found with a localities map, collecting zones, and geology context. Generate a sample map preview below.

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North ZoneCentral RidgeSouth Basin

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.