Romanorlovite

romanorlovite

avdoninite

mitscherlichite

mellizinkalite

Images

Formula: K₁₁Cu₉Cl₂₅(OH)₄.2H₂O
Chloride
Crystal System: Tetragonal
Specific gravity: 2.755 calculated
Hardness: 3
Streak: Yellow
Colour: Yellow-brown to dark brown, tiny crystals are honey- or golden- yellow
Solubility: Soluble in water
Environments

Fumeroles

Romanorlovite is a relatively new mineral, approved in 2014 and to date (March 2025) reported only from the type locality.

Localities

At the type locality, the Glavnaya Tenoritovaya fumarole, Second scoria cone, Northern Breakthrough, Great Fissure eruption, Tolbachik Volcanic field, Milkovsky District, Kamchatka Krai, Russia, romanorlovite occurs as sublimates around the active fumarole. Associated minerals include avdoninite, belloite, sylvite, carnallite, mitscherlichite, sanguite, chlorothionite, eriochalcite, chrysothallite and mellizinkalite (HOM).
Romanorlovite occurs in the upper, moderately hot zone of the fumerole as prismatic, equant, or tabular tetragonal crystals up to 0.1 mm, clusters up to 0.5 mm, and crusts up to 2 × 2 mm² in area (Mindat).
Romanorlovite from the Glavnaya Tenoritovaya Fumarole - Image

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