Senarmontite Value, Price, and Jewelry Information

Rob Lavinsky, iRocks.com – CC-BY-SA-3.0 [CC-BY-SA-3.0], via Wikimedia Commons

Senarmontite

Senarmontite is a rare mineral, restricted in occurrence to the presence of antimony sulfide ores. It is much too soft to wear, and the colors are usually nondescript. However, a faceted senarmontite in any size would be a great rarity.

Senarmontite Information

Data Value
Name Senarmontite
Stone Sizes There are reports of very tiny gems having been cut from transparent crystal fragments. Stones up to 1-2 carats seem possible.
Formula Sb2O3.
Colors Colorless to grayish white.
Fracture Uneven
Hardness 2-2.5
Cleavage Traces
Crystallography Isometric. Crystals octahedral, up to 3 cm on edge; massive.
Refractive Index 2.087
Birefringence None.
Luminescence None.
Luminescence Present No
Absorption Spectrum Not diagnostic.
Pleochroism None.
Optics Isotropic; N = 2.087.
Luster Resinous.
Specific Gravity 5.5.
Transparency Transparent to translucent.

SENARMONTITE Isomorphous with Valentinite.

Optics: Isotropic; N= 2.087.

Occurrence: A secondary mineral formed by the alteration of stibnite (Sb2S3)

Inyo County, California; South Dakota.

Quebec; Canada; Algeria; France; Germany; Sardinia; Italy.

Comments: Senarmontite is a rare mineral, restricted in occurrence to the presence of antimony sulfide ores. It is much too soft to wear, and the colors are usually nondescript. However, a faceted senarmontite in any size would be a great rarity.

Name: After Henri de Senarmont, professor of mineralogy at the School of Mines in Paris, who first described the species.

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