Hydrodresserite

hydrodresserite

dresserite

weloganite

cerussite

Images

Formula:BaAl2(CO3)2(OH)4.3H2O
Hydrated carbonate containing hydroxyl, dresserite group
Specific gravity: 2.8
Hardness: 3 to 4
Streak: White
Colour: Colourless, white
Environments

Metamorphic 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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