Hydrated carbonate containing hydroxyl, dresserite group
Specific gravity: 2.8
Hardness: 3 to 4
Colour: Colourless, white
Hydrodresserite is a very rare mineral known only from its type locality to date (September 2020).
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).
Hydrodresserite characteristically dehydrates to dresserite under low humidity conditions (Webmin).
Back to Minerals