Lanarkite Locality: Susanna Mine (Glennery Scar Vein; Susanna Vein (Scar Vein); Portobello Vein; Humby Vein; Lead Vein), Leadhills , South Lanarkshire , Strathclyde (Lanarkshire) , Scotland , UK ( Locality at mindat.org ) Size: miniature, 3.3 x 3.2 x 2.2 cm Lanarkite This is a rich specimen for the size with numerous off-white, platy crystals standing up on matrix. Surely there are other species present as well, in this complex assemblage known for its rarities. However, the lanarkite is, unusually, very clear and dominant. Type locality material, now hard to obtain. Ex. John White Collection. — Photo: Robert M. Lavinsky · CC BY-SA 3.0
Lanarkite
A lead oxysulfate found at Leadhills in Scotland's Lanarkshire — white or pale-green microscopic needles.
Intro adapted from Wikipedia (CC BY-SA).
Lanarkite is an IMA-recognized mineral species in the sulfate class, with the chemical formula Pb₂O(SO₄).
It crystallizes in the monoclinic crystal system (space group C2/m).
Key properties: Mohs hardness 2–2.5; specific gravity 6.92; White streak; Adamantine to resinous, pearly on cleavage surfaces luster; optically biaxial.
IMA symbol Lan, grandfathered status — known before the IMA’s founding, named in 1832.
A rare secondary mineral found in the oxidized zone of lead sulfide deposits.
It is found associated with Cerussite, leadhillite, susannite, hydrocerussite, caledonite.
The name refers to the occurrence in the Susanna mine, Lanarkshire, Scotland.