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Formula: BaAl2(CO3)2(OH)4.3H2O
Hydrated carbonate containing hydroxyl, dresserite group
Crystal System: Triclinic
Specific gravity: 2.80 measured, 2.817 calculated
Hardness: 3 to 4
Streak: White
Colour: Colourless, white
Environments
Hydrodresserite is a very rare mineral known only from its type locality to date (September 2020).
Localities
At the type locality, the Francon quarry, Montréal, Quebec, Canada, hydrodresserite occurs in vugs in
metamorphosed limestone, near the contact zone of a
dawsonite-rich silicocarbonatite sill (Webmin, HOM).
Hydrodresserite is a late stage alteration product, forming powdery to granular coatings on
galena crystals with cerussite,
dresserite, weloganite and
quartz
(Minrec 37.1.37, HOM).
Alteration
Hydrodresserite characteristically dehydrates to dresserite
under low humidity conditions
(Webmin).
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