Bottinoite

minerals

ullmannite

bindheimite

hydrozincite

Formula: NiSb5+2(OH)12.6H2O
Hydroxide, bottinoite group
Specific gravity: 2.83
Hardness: 3½
Streak: Very light blue
Colour: Pale blue to pale blue-green
Environments

Hydrothermal environments

Bottinoite occurs adjacent to and incrusting ullmannite in oxidised hydrothermal base-metal deposits (Mindat, Webmin, HOM). Associated minerals include ullmannite, galena, sphalerite, chalcopyrite, pyrite, quartz, calcite, bindheimite, cerussite, hydrozincite, chrysocolla, malachite, hemimorphite, pyromorphite and wulfenite (HOM).

Localities

At the type locality, the Bottino mine, Stazzema, Lucca Province, Tuscany, Italy, bottinoite occurs in an oxidised hydrothermal base-metal deposit (Mindat) on fractures in schist associated with calcite, siderite, quartz, pyrite and chalcopyrite, perched on ullmannite crystals (Dana, AM 77.1301-1304). The bottinoite has apparently been formed by the alteration of ullmannite (AM 77.1301-1304)

At Brownley Hill mine, Alston Moor, Cumbria, England, UK, bottinoite has been found on galena associated with cerussite, sulphur, quartz, ullmannite and dolomite. It is likely that the bottinoite formed by the oxidation of ullmannite (Minrec 31.3.243-244).

At Hendrefelin mine, Ysbyty Ystwyth, Ceredigion, Wales, UK, bottinoite has been found as well-developed sprays within cavities in highly altered ullmannite - chalcopyrite - galena bearing vein quartz (MW).

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