jamesonite

{{Infobox mineral |boxbgcolor=#555647| name = Jamesonite | boxtextcolor = #fff | image = Jamesonite-rom27a.jpg | imagesize = 260px | alt = | caption = Jamesonite crystals | category = Sulfosalt | formula = Pb4FeSb6S14 | IMAsymbol = Ja | molweight = | strunz = 2.HB.15 | dana = | system = Monoclinic | class = Prismatic (2/m) (same H-M symbol) | symmetry = P21/a | unit cell = | color = grey-black | colour = | habit = | twinning = | cleavage = {001} good; also possibly {010} and {120} | fracture = | tenacity = | mohs = | luster = metallic | streak = grey-black | diaphaneity = opaque | gravity = 5.63 | density = | polish = | opticalprop = | refractive = | birefringence = | pleochroism = | 2V = | dispersion = | extinction = | length fast/slow = | fluorescence = | absorption = | melt = | fusibility = | diagnostic = | solubility = | impurities = | alteration = | other = | prop1 = | prop1text = | references = | var1 = | var1text = | var2 = | var2text = | var3 = | var3text = | var4 = | var4text = | var5 = | var5text = | var6 = | var6text = }}

Jamesonite (also axotomous antimony glance, domingite, comuccite, pfaffite, grey antimony or feather ore) is a sulphosalt mineral, a lead, iron, antimony sulphide with formula Pb4FeSb6S14. With the addition of manganese it forms a series with benavidesite. 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. It is one of the few sulphide 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.