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Hydromagnesite from
Black Lake, Thetford Mines, Les Appalaches RCM, Chaudière-Appalaches, Québec, Canada

Locality type:Lake
Formula:Mg5(CO3)4(OH)2 · 4H2O
Comments:Aug 2, 2012

From Maggie Wilson -

We acquired a specimen labelled hydromagnesite from a dealer several years back. Yesterday, we tested the material in HCL and it dissolved but did not fizz.

From Laszlo:

"Scolecite is more likely to dissolve than tobermorite and since it is on stilbite (if I recall correctly) it is likely scolecite. There is okenite there as well. The first time we collected at Mine Lac d'Amiante, we found some white fibrous material and the "knowledgeable" collectors in our group declared it hydromagnesite. This was in 1993, ever since then I have been looking for hydromagnesite from that mine.

Most of the hydromagnesites sold by collectors and dealers that I have come across turned out to be zeolites (scolecite mostly) and also tobermorite. In fact I am still looking for confirmed hydromagnesite from the area as I am trying to archive the minerals found in different mines in the area. I assume that your specimen is from Mine Lac d'Amiante, which apparently is in St-Joseph-de Coleraine, although everybody including myself thought it was in Black Lake."
References:Maggie Wilson
Associated Minerals Based on Photo Data:
Stilbite subgroup4 photos of Hydromagnesite associated with Stilbite subgroup at this locality.
Mineral Data:Click here to view Hydromagnesite data
Locality Data:Click here to view Black Lake, Thetford Mines, Les Appalaches RCM, Chaudière-Appalaches, Québec, Canada
Nearest other occurrences of Hydromagnesite
10.7km (6.6 miles) Montréal Chrome pit (Montréal mine; Montréal-Coleraine mine; Paré pit; Black Lake Chrome quarry), Saint-Joseph-de-Coleraine, Les Appalaches RCM, Chaudière-Appalaches, Québec, Canada
11.9km (7.4 miles) Belmina mine, Saint-Julien, Les Appalaches RCM, Chaudière-Appalaches, Québec, Canada
54.6km (34.0 miles) Jeffrey Mine ("Johns-Manville Mine"), Asbestos, Les Sources RCM, Estrie, Québec, Canada
Mineral and/or Locality  
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