D'ansite-(Mn)

d'ansite-(Mn)

aphthitalite

halite

Images

Formula: Na₂₁Mn²⁺(SO₄)₁₀Cl₃
Valence: Na₂₁Mn²⁺(S⁶⁺O₄)₁₀Cl₃
Sulphate, d'ansite group, manganese-bearing mineral
Crystal system: Isometric
Specific gravity: 2.610 calculated
Streak: White
Colour: Colourless
Luminescence: No fluorescence under long wave or short wave UV
Environments

Fumeroles

Localities

At the type locality, the Somma-Vesuvius Complex, Campania, Italy, d’ansite-(Mn) was found as encrustations on a pyroclastic breccia in fumaroles; it was collected in May 1927 in a 1926 eruption fumarole with a temperature of about 350°C. D’ansite-(Mn) forms colourless translucent tristetrahedral crystals up to 0.2 mm on edge associated with halite and aphthitalite. It has a white streak and a vitreous lustre, and is not fluorescent when exposed to either long wave or short wave UV (AM 99.2438–2439).
D'ansite-(Mn) from Vesuvius fumaroles - Image

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