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Formula: Al2(PO4)(OH)3.H2O
Hydrated phosphate containing hydroxyl, forms a series with bulachite (Webmin)
Crystal System: Orthorhombic
Specific gravity: 2.552 measured, 2.551 calculated
Hardness: 5½
Streak: White
Colour: Pale yellow to colourless
Environments
Localities
At the type locality, Mount Kourou Diakouma, Saraya, Tambacounda region, Senegal, senegalite occurs in the
oxidised zone of a
magnetite iron ore deposit. Associated minerals include
augelite, crandallite,
turquoise, variscite and
wavellite
(R&M 94.5.460-461, Mindat, HOM, AM 62.593-600).
Spain.
Apart from Senegal, the only other country that currently (May 2023) has senegalite listed on Mindat is Brazil,
with three known localities. The Jangada mine in Minas Gerais is perhaps the most noteworthy because yellow drusy
senegalite crystals have been found in this deposit, which, like the occurrence in Senegal, is also an iron ore
deposit. The other two localities are the Pirocaua deposit in Maranhão and the Maicuru alkaline complex in Pará,
neither of which seems to have produced noteworthy specimens
(R&M 94.5.460-461).
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