An overview on Pyrrhotite Jewelry and Gemstones. Covers details and essential information on the physical properties and characteristics of Pyrrhotite gems.
The International Gem Society (IGS) has a list of businesses offering gemstone appraisal services.
|Crystallography||Hexagonal; also orthorhombic, monoclinic, depending on stoichiometry. Crystals tabular, platy, pyramidal, sometimes in clusters (rosettes); usually massive or granular.|
|Colors||Bronze-yellow to bronze-red or brownish; tarnishes readily, becomes iridescent.|
|Cleavage||None; sometimes basal parting observed; fracture subconchoidal to uneven; brittle.|
|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.|
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.