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Formula: K4(Si20Al4)O48.13H2O
Tectosilicate (framework silicate), dachiardite subgroup,
zeolite group
Crystal system: Monoclinic
Specific gravity: 2.18 measured, 2.169 calculated
Hardness: 4
Streak: White
Colour: Snow-white
Environments
Volcanic igneous environments
Hydrothermal environments
Dachiardite-K is a relatively new mineral, approved in 2015 and to date (July 2025) reported only from the
type locality.
Localities
At the type locality, the Dachiardite-K occurrence, Zvezdel, Momchilgrad Municipality, Kardzhali Province, Bulgaria,
dachiardite-K occurs in the walls of
opal-chalcedony veins cutting
hydrothermally-altered volcanic rocks. Associatied minerals include
dachiardite-Ca,
dachiardite-Na,
ferrierite-Mg,
ferrierite-K,
clinoptilolite-Ca,
clinoptilolite-K,
mordenite, smectite,
celadonite, calcite,
baryte, chalcedony and
opal
(HOM).
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