How do I identify Freieslebenite?

Freieslebenite can be identified by its hardness of 2.5 on the Mohs scale, grey color. Look for these key characteristics when examining specimens.

What color is Freieslebenite?

Freieslebenite typically appears in grey, dark grey. Color can vary depending on impurities and formation conditions.

How hard is Freieslebenite?

Freieslebenite has a hardness of 2.5 on the Mohs scale. This makes it a soft mineral that can be scratched easily.

Freieslebenite

A variety of Freieslebenite Group

What is Freieslebenite?

Freieslebenite is a sulfosalt mineral composed of antimony, lead, and silver. Sulfosalt minerals are complex sulfide minerals with the formula: AmBnSp. The formula of freieslebenite is AgPbSbS3. Freieslebenite was discovered in approximately 1773 in the Himmelsfurst mines of Freiberg, Saxony, Germany. The mineral was initially called Schilf-Glaserz; however, in 1845 it was given the current name Freieslebenite after the Mining Commissioner of Saxony, Johann Carl Freiesleben (1774–1846).

Freieslebenite Market Value Calculator

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

Freieslebenite Localities Map

See where Freieslebenite 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 Freieslebenite

Freieslebenite has a metallic luster and is opaque in transparency. The general colors for freieslebenite are gray, silver and white. It has a whitish-gray streak with a hardness of 2.5 on the Mohs scale. It has an imperfect cleavage and an irregular fracture. The density of freieslebenite is 6.20-6.23 g/cm.

Composition of Freieslebenite

Freieslebenite is a superstructure of a PbS-type substructure. The crystal structure is monoclinic with a space group P21/a, with a = 7.518(1), b = 12.809(4), c = 5.940(1) Å, β = 92.25(1)° and Z = 4(Ito, 1973). Sb has a trigonal-pyramidal coordination of S atoms, this structure isolates the SbS3 pyramids from themselves. The Sb–S distances are 2.431, 2.453 and 2.480(4) Å. Six S atoms are coordinated with Pb in a distorted octahedral arrangement. The Pb–S distances range from 2.806 to 3.167(4) Å. Ag has three nearest S neighbors at the distances 2.522, 2.575 and 2.687(4) Å. The AgS3 group is almost planar. A fourth S atom is at a distance of 2.928(4) Å from Ag, the Ag–S being closely perpendicular to the AgS3 plane (Cascarano et al., 1987). The crystal structure of freieslebenite was determined by Wuensch and Nowacki in 1967. Wuensch and Nowacki determined the crystal structure of freieslebenite using three-dimensional counter data, systematic consideration of all possible arrangements permitted by the subcell-supercell relationship and the method of key shifts (Ito, 1973).