Black Lake, Thetford Mines, Les Appalaches RCM, Chaudière-Appalaches, Québec, Canada
|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.
"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."
|Associated Minerals Based on Photo Data:|
|Stilbite subgroup||4 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|