ليدهيليت

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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Article · العربية

ليدهيليت هو معدن من معادن الرصاص من فئة معادن الكربونات. تكون صيغة الوحدة البلورية على الشكل Pb4SO4(CO3)2(OH)2 اكتشف المعدن أول مرة سنة 1832 في منجم ليدهيلز Leadhills في مقاطعة لاناركشاير في اسكتلندا، وإليه تنسب التسمية.

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