Anhydrous sulphate containing halogen
Specific gravity: 3.09 to 3.11
Streak: Yellowish green
Colour: Emerald green, dark green, black
Solubility: Decomposed by water, forming a residue. Readily soluble in dilute acids
At the Vesuvius fumaroles, Mt Vesuvius, Somma-Vesuvius Complex, Naples, Campania, Italy, piypite is associated with paratacamite (HOM).
At the type locality, the Great Fissure eruption, Tolbachik volcano, Kamchatka Krai, Russia, piypite forms moss-like aggregates of imperfect long-columnar or acicular crystals up to 3 cm long and l mm across, often empty inside, in 500oC fumarole incrustations. It is associated with aphthitalite, dolerophanite, euchlorine, chalococyanite and tenorite (AM 70.437-438). Other associated minerals include halite, sylvite, langbeinite, hematite, tolbachite, urusovite, ponomarevite, cotunnite, sofiite, averievite, fedotovite, alarsite, alumoklyuchevskite, nabokoite and lammerite (HOM).
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