Pyrrhotite Value, Price, and Jewelry Information

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By Didier Descouens (Own work) [GFDL or CC-BY-SA-3.0-2.5-2.0-1.0], via Wikimedia Commons

An overview on Pyrrhotite Jewelry and Gemstones. Covers details and essential information on the physical properties and characteristics of Pyrrhotite gems.

Pyrrhotite Information

Data Value
Name Pyrrhotite
Stone Sizes Cabochons of almost any size could be cut from the massive material. Such stones are always opaque and metallic and can be attractive.
Formula Fe1-xS.
Colors Bronze-yellow to bronze-red or brownish; tarnishes readily, becomes iridescent.
Fracture Subconchoidal to uneven, Sometimes basal parting observed
Hardness 3.5-4.5
Cleavage None
Crystallography Hexagonal; also orthorhombic, monoclinic, depending on stoichiometry. Crystals tabular, platy, pyramidal, sometimes in clusters (rosettes); usually massive or granular.
Crystallographic Forms
Birefringence None
Luster Metallic.
Specific Gravity 4.58-4.65
Transparency Opaque.

Also known as pyrrohotite.

Streak: grayish black.

Other Tests: Magnetic, varying in intensity, lost on heating. Decomposed by HCl.

Occurrence: Associated with pyrite and other sulfides throughout the world, often as a magmatic segregation in basic igneous rocks. Occasionally in pegmatites and contact metamorphic rocks, fumaroles, and basalts. Also occurs in meteorites.

Sudbury, Ontario, Canada.

Morro Velho, Brazil.

Rumania; Italy; Germany; Norway; Sweden.

Potosi Mine, Santa Eulalia, Chihuahua, Mexico.

Pennsylvania; Tennessee; New York; Maine; Connecticut.

Name: From a Greek word meaning reddish.

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