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| Jamesonite | |
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| Category: | Sulfosalt |
| Formula: | Pb4FeSb6S14 |
| Imasymbol: | Ja[1] |
| Strunz: | 2.HB.15 |
| System: | Monoclinic |
| Class: | Prismatic (2/m) (same H-M symbol) |
| Symmetry: | P21/a |
| Color: | gray-black |
| Cleavage: | good; also possibly and |
| Luster: | metallic |
| Streak: | gray-black |
| Diaphaneity: | opaque |
| Gravity: | 5.63 |
Jamesonite (also axotomous antimony glance,[2] domingite, comuccite, pfaffite, gray antimony or feather ore)[3] is a sulfosalt mineral, a lead, iron, antimony sulfide with formula Pb4FeSb6S14. With the addition of manganese it forms a series with benavidesite.[4] It is a dark grey metallic mineral which forms acicular prismatic monoclinic crystals. It is soft with a Mohs hardness of 2.5 and has a specific gravity of 5.5 – 5.6.[5] It is one of the few sulfide minerals to form fibrous or needle like crystals. It can also form large prismatic crystals similar to stibnite with which it can be associated. It is usually found in low to moderate temperature hydrothermal deposits.[4]
It was named for Scottish mineralogist Robert Jameson (1774–1854). It was first identified in 1825 in Cornwall, England.[6] It is also reported from South Dakota and Arkansas, US; Zacatecas, Mexico; and Romania.
Jamesonite generally has a very large number of synonyms, as well as regional and trivial names, which is unusual even for such noticeable minerals from a practical point of view. First of all, this is the already mentioned above domingite, comuccite, pfaffite, gray antimony or feather ore. In addition, jamesonite is also known by its English names: warrenite, wolfsbergite, plumite, rosellan, rosenite, sakharovaite, bleiantimonit, antimonial radiant glance, warrenite, falkmanite... In the old German mineralogical literature the following names for jamesonite were also found: lumpenerz, stahlantimonglanz, spiessglasfedererz, chalybinglanz, zundererz.[7] Moreover, the term “axotomous antimony glance” until the beginning of the 19th century was considered scientific in the mineralogical environment and was predominant.