لیدهیلیت

Leadhillite is a lead sulfate carbonate hydroxide mineral, often associated with anglesite. It has the formula Pb4SO4(CO3)2(OH)2. Leadhillite crystallises in the monoclinic system, but develops pseudo-hexagonal forms due to crystal twinning. It forms transparent to translucent variably coloured crystals with an adamantine lustre. It is quite soft with a Mohs hardness of 2.5 and a relatively high specific gravity of 6.26 to 6.55.

Key facts

Mineral.name: Leadhillite
Mineral.image: Leadhillite-189253.jpg
Mineral.imagesize: 200px
Mineral.caption: Thin crystals of transparent leadhillite, inside a vug of galena which seems to be partially altered to cerussite. From the type locality, Leadhills, South Lanarkshire, Scotland. Size: 5.3 x 5.1 x 4.4 cm.
Mineral.category: Carbonate minerals
Mineral.formula: Pb4SO4(CO3)2(OH)2
Mineral.IMAsymbol: Lhl
Mineral.molweight: 1,078.90 g/mol
Mineral.strunz: 5.BF.40
Mineral.dana: 17.1.2.1
Mineral.system: Monoclinic
Mineral.class: Prismatic (2/m) (same H-M symbol)
Mineral.symmetry: P21/a
Mineral.unit cell: a = 9.11, b = 20.82 c = 11.59 [Å]; β = 90.46°; Z = 8
Mineral.colour: Colourless to white, grey, yellowish, pale green to blue
Mineral.habit: Usually pseudo-hexagonal, thin to thick tabular {001} with hexagonal outline
Mineral.twinning: Commonly twinned, twin plane {140}
Mineral.cleavage: Perfect on {001}

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Wikidata facts

Subclass of: carbonate and nitrate class of minerals
Named after: Leadhills
Image: Leadhillite-169951.jpg

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Nickel-Strunz 9th edition (updated 2009): 5.BF.40
Commons category: Leadhillite
Nickel-Strunz '10th ed', review of (9th ed/ 2009 update): 5.BF.40
streak color: white
crystal system: monoclinic crystal system
described by source: Encyclopædia Britannica 11th edition
IMA Mineral Symbol: Lhi
chemical formula: Pb₄(SO₄)(CO₃)₂(OH)₂
Strunz 8th edition (series ID, updated): VI/B.05

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