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Formula: Ca2(Ca1.5Zr0.5)Na(NaCa)Ti(Si2O7)2(OF)F2
Sorosilicate (Si2O7 groups), seidozerite supergroup,
zirconium- and titanium- bearing mineral
Specific gravity: 3.195 calculated
Hardness: 5
Streak: Pale yellow to beige
Colour: Pale yellow to brown
Luminescence: Fluoresces weak yellow under UV (100–280 nm)
Environments
Volcanic igneous environments
Pegmatites
Bortolanite is a new mineral, approved in 2021 and to date (August 2022) reported only from the type locality.
Localities
At the type locality, the Bortolan quarry, Poços de Caldas, Poços de Caldas alkaline complex, Minas Gerais, Brazil,
bortolanite occurs in the matrix of evolved subvolcanic phonolites
and nepheline syenite
pegmatites. Associated minerals include
götzenite, nepheline,
K-feldspar, aegirine,
natrolite, analcime and
manganese-bearing pectolite.
Bortolanite is of late magmatic origin, and occurs as aggregates from 1 mm to 1.5 cm in size
(CM 60.4.699-712).
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