Images
Formula: Na4Cu(SO4)3
Sulphate
Crystal System: Trigonal
Specific gravity: 2.783 calculated
Hardness: 3
Colour: Light blue or greenish-bluish to almost colourless
Environments
Cuprodobrovolskyite is a new mineral, approved in 2022 and to date (March 2024) reported only from the type locality.
Localities
At the type locality, the Arsenatnaya fumarole, Second scoria cone, Northern Breakthrough, Great Fissure
eruption, Tolbachik Volcanic field, Milkovsky District, Kamchatka Krai, Russia, cuprodobrovolskyite
has been found in sublimates, associated with petrovite,
saranchinaite, euchlorine,
krasheninnikovite,
langbeinite,
calciolangbeinite,
anhydrite, sanidine,
tenorite and hematite.
Cuprodobrovolskyite occurs as coarse hexagonal tabular or equant, typically skeletal crystals up to 1 mm in size
and their clusters or crusts up to 1.5 × 2.5 cm2 in area. Cuprodobrovolskyite is transparent, light
blue or greenish-bluish to almost colourless, with vitreous lustre; it is considered to be the highest-temperature
phase among anhydrous sodium-copper sulphate minerals
(MM 88.49-60).
Back to Minerals