Linarite

sulphate

galena

Formula: CuPb(SO4)(OH)2
Sulphate
Specific gravity: 5.3 to 5.5
Hardness: 2½
Streak: Light blue
Colour: Blue
Solubility: Moderately soluble in nitric acid
Environments:

Hydrothermal environments

Linarite occurs as a secondary mineral in the oxidation zone of high temperature hydrothermal deposits, where it is formed as an alteration product of galena. In some localities in Cumbria, England, it is found on limonitic quartz or partly decomposed galena with cerussite. It also occurs near the contact between galena and the surrounding matrix, if any copper sulphides are present (JRS 11.13). It may be formed by post-mining oxidation. The linarite, anglesite, brochantite assemblage is typical for some localities, and helps to distinguish linarite from azurite.
Linarite and caledonite are both important lead/copper supergene minerals; both minerals can be found alone in cavities although they can also occur together, and both are often associated with simple lead and copper minerals such as cerussite and brochantite and, to a lesser extent, malachite; they can be found in such combinations in the carbonate rich English Pennines. When low concentrations of lead ions Pb2+ build up in an environment dominated by copper minerals, such as brochantite, the lead may form linarite (JRS 18.14).
Linarite has been found pseudomorphed by chrysocolla, malachite and brochantite (JRS 11.35-38), and it is often intergrown with leadhillite (R&M 85.6.519).

In Block 14, Broken Hill, New South Wales, linarite has been found as crusts coating cerussite and anglesite, lining fractures in gneiss. Some larger crystals have been found coating cerussite associated with brochantite and smithsonite (AJM 3.1.43).

At Kintore, Broken Hill, New South Wales, Australia, linarite has been found as impregations with other sulphates such as brochantite and connellite in quartz - chalcocite rocks, and with malachite on fractures (AJM 3.1.43).

At the Kapi mine, Tasmania, Australia, linarite occurs rarely overgrown by cerussite and anglesite (AJM 12.2.83).

At the Shangri La mine, Kimberley, Western Australia, linarite occurs as crusts coating malachite and cerussite in cavities (AJM 16.1.21).

At the Wheal Fortune copper mine, Northampton, Western Australia, linarite occurs intergrown with brochantite in crusts coating oxidised quartz-rich granitic gneiss, which contains minor chalcopyrite (AJM 18.1.44).

At the Devons Cut deposit, Braeside lead field, Pilbara, Western Austrlia, linarite has been found in association with caledonite and cerussite (AJM 13.2.60).

At Llallagua, Bolivia, crusts of a mixture of linarite and caledonite have been described (Minrec 37.2.142).

At the Imiter mine, Morocco, linarite is associated with cerussite, and also with weathered chalcopyrite and covellite (Minrec 42.2.125).

At the Driggith and Sandbed mines, Caldbeck, Allerdale, Cumbria, UK, linarite is a common component of crusts on weathered sulphides formed by post-mining oxidation. It also occurs as crystals in cavities in oxidised ore, commonly associated with brochantite and cerussite, and sometimes with hemimorphite, leadhillite, schulenbergite and anglesite (JRS 9.24).

At Roughton Gill, Caldbeck, Allerdale, Cumbria, UK, linarite has been found in cavities and fractures in vein quartz, commonly associated with leadhillite and caledonite. Linarite crystals are sometimes partly replaced by brochantite. Linarite-rich lenses are commonly surrounded by iron-stained quartz, pyromorphite, chrysocolla and malachite (JRS 11.17).
Most linarite specimens are crusts which are a dump alteration product of galena and chalcopyrite. Crystals, however, have been found associated with malachite, caledonite or leadhillite (JRS 14.15).

At Silver Gill, Roughton Gill, Caldbeck, Allerdale, Cumbria, UK, linarite is commonly found on limonitic quartz or partly decomposed galena with cerussite, associated with brochantite, langite, hemimorphite and cerussite (JRS 8(2).92).

At Short Grain, Caldbeck, Allerdale, Cumbria, UK, linarite usually occurs as crusts of post-mining origin, but a specimen has been found with linarite crystals to 5 mm associated with minor caledonite and cerussite (JRS 12.55).

At the Gallagher Mine, Tombstone Hills, Cochise county, Arizona, USA, linarite has been found associated with leadhillite, diaboleite and anglesite on material from the dump (R&M 90-4.344).

At the Brown Monster mine, Inyo county, California, USA, linarite occurs with caledonite near altered galena pods (Minrec 41.2.189).

At the Reward mine, Inyo county, California, USA, linarite occurs along fractures in quartz veins, associated with brochantite, cerussite, anglesite, leadhillite and caledonite in various combinations (Minrec 41.2.189).

Back to Minerals