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Mineralpedia Details for Leadhillite

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Leadhillite

Leadhillite

Named for its type locality at the Susanna mine at Leadhills in Scotland. Leadhillite is an uncommon mineral in oxidized lead deposits and in addition to Scotland, can be found in England, Austria, the United States, Namibia, and Australia among several others. Leadhillite can fluoresce a pale yellow under ultraviolet light. It will decompose in hot water. Heating will result in a reversible alteration to susannite.

Ref. Handbook of Mineralogy, Anthony et al (1995) and MSA at http://www.handbookofmineralogy.org/pdfs/leadhillite.pdf

Formula
Pb4(SO4)(CO3)2(OH)2 
Crystal System
Monoclinic 
Crystal Habit
Pseudo Hexagonal, Tabular, Massive - Granular 
Cleavage
Perfect, Indistinct, None 
Luster
Adamantine 
Color
colorless, gray, yellowish, white, light blue 
Streak
white 
Class
Monoclinic - Prismatic 
Fracture
Sectile 
Hardness
2.5 
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Leadhillite from Red Gill mine, Caldbeck Fells, Cumbria, England

Leadhillite
            from Red Gill mine, Caldbeck Fells, Cumbria, England

Thin, platy, pseudo-hexagonal crystals to less than 1mm.

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Leadhillite from Beer Cellar mine, Granby, Newton Co., Missouri, United States

Leadhillite
            from Beer Cellar mine, Granby, Newton Co., Missouri, United States

Exceptional pearly white platy Leadhillite in pseudohexagonal crystals to 6mm.

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Leadhillite from 510 level, Chalk Mountain mine, Churchill Co., Nevada, United States

Leadhillite
            from 510 level, Chalk Mountain mine, Churchill Co., Nevada, United States

Rare specimen for Nevada - Leadhillite, glassy,clear, hexagonal crystal plates to 4mm on Galena and associated with orange Descloizite, Wulfenite and Anglesite.

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Leadhillite from Mammoth mine, Tiger, Pinal Co., Arizona, United States

Leadhillite
            from Mammoth mine, Tiger, Pinal Co., Arizona, United States

Small specimen but fabulous under the scope with 1-2mm pseudohexagonal crystals with the blue tints of perhaps Caledonite.

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Leadhillite from Bisbee, Cochise Co., Arizona, United States

Leadhillite
            from Bisbee, Cochise Co., Arizona, United States

Leadhillite crude platy crystals to over 1cm.

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Leadhillite from Tsumeb mine, Tsumeb, Namibia

Leadhillite
            from Tsumeb mine, Tsumeb, Namibia

A small 1cm partial, crystal section. Locality specimen.

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