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Formula: NaMgAl5(PO4)4(OH)6.2H2O
Hydrated phosphate, dufrénite group, forms a series with
burangaite
Crystal System: Monoclinic
Specific gravity: 2.948 calculated
Hardness: 5
Streak: White
Colour: Blue to colourless
Luminescence: Not fluorescent under UV
Environments
Pegmatites
Hydrothermal environments
Localities
At the type locality, the Gentil claim, Mendes Pimentel, Minas Gerais, Brazil, matioliite occurs as a
secondary hydrothermal mineral in the
granite pegmatite.
Some crystals are zoned to more iron-rich compositions with an Fe2+:Mg ratio of
approximately 1:1, corresponding to an intermediate member of the
burangaite-matioliite solid-solution series. Matioliite is
intimately associated with fluorapatite,
crandallite, and zoned
gormanite-souzalite crystals.
The matioliite forms prismatic to tabular, transparent, vitreous crystals up to 1 mm long
(AM 91.1932-1936.
Other associated minerals include quartz,
muscovite, moraesite,
childrenite,
cassiterite and albite
(Mindat).
Matioliite from the Gentil Claim -
Image
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