Kegelite

kegelite

fleischerite

melanotekite

alamosite

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Formula: Pb₄₂Si₄O₁₀(SO₄)(CO₃)₂(OH)₄
Phyllosilicate (sheet silicate)
Crystal System: Monoclinic
Specific gravity: 4.5 measured, 4.76 calculated
Colour: Colourless
Solubility: Insoluble in hydrochloric acid (AM 61.175-176)
Common impurities: Cu,H₂O
Environments

Hydrothermal environments

Kegelite is a rare supergene lead mineral.

At the type locality, the Tsumeb Mine, Oshikoto Region, Namibia, kegelite occurs in a deep oxidation zone in a polymetallic hydrothermal mineral deposit, intergrown with hematite and mimetite (Dana) and associated with quartz, galena, leadhillite, anglesite, fleischerite, melanotekite and alamosite (HOM, Mindat, AM 75.702-704).

At Wanlockhead, Dumfries and Galloway, Scotland, UK, V has been found on the spoil heaps on a small block with an exterior of weathered hemimorphite encrusted with minute descloizite crystals together with a few vanadinite crystals. The interior of the block has kernels of residual galena and mudstone surrounded by leadhillite, cerussite and quartz. Kegelite was embedded in leadhillite and intimately associated with cerussite (JRS 8.110-111).

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