375 - Jamesonite

ID	375
Mineral	Jamesonite
Location	Zacatecas City - Zacatecas - Mexico
Fluorescence	LW-UV: close SW-UV: close
Mindat.org	View Jamesonite information at mindat.org

ID	2072
Long ID	1:1:2072:1
Formula	`Pb₄FeSb₆S₁₄`
IMA Status	0 1
Other Occurrences	Late stage hydrothermal mineral formed at moderate to low temperature.
Discovery Year	1825
Diapheny	Opaque
Cleavage	{001} good; also possibly {010} and {120}
Tenacity	brittle
Colour	Gray-black; iridescent at times
Hardness (min)	2.5
Hardness (max)	2.5
About the name	Named in honor of Robert Jameson (11 July 1774, Leith, Scotland – 19 April 1854, Edinburgh, Scotland), naturalist and mineralogist. He was Professor of Natural History at the University of Edinburgh for fifty years.
Streak	Gray-black
Crystal System	Monoclinic
Cleavage Type	Distinct/Good
Morphology	Acicular to fibrous [001] and striated parallel [001]. In felted masses of needles. Also massive, fibrous to columnar; radial or plumose at times. In subparallel aggregates of prismatic crystals, forming a columnar mass.
Twinning	On {100}.
key_elements	0 1
shortcode_ima	Ja

Jamesonite