Litidionite

litidionite

tridymite

wollastonite

augite

Images

Formula: KNaCuSi4O10
Inosilicate (chain silicate), litidionite group
Specific gravity: 2.75
Hardness: 5 to 6
Streak: Bluish white
Colour: Blue, white
Common impurities: Fe,Pb,Ca
Environments

Fumeroles

Localities

At the type locality, Mt Vesuvius, Somma-Vesuvius Complex, Naples, Campania, Italy, litidionite occurs as tiny plates in lapilli strongly modified by the fumarolic activity subsequent to the Vesuvius eruption of 1873. The dimension of the lapilli range from a few mm up to 30 mm. The nuclei of the lapilli are small fragments of well formed augite crystals ejected by the volcano. The fumarolic action coated the nuclei with a layer of white microcrystalline tridymite which is overlaid by a blue glassy crust whose cavities are coated by litidionite, tridymite, and minor wollastonite. Litidionite is the unique copper mineral occurring in these lapilli, although several other copper minerals (covellite, tenorite, chlorothionite, cyanochroite, chalcocyanite and others) were produced by the fumarolic activity in the Vesuvius crater (AM 60.471-474).

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