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Roger Warin
Joined: 23 Jan 2013
Posts: 1195
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Posted: May 29, 2023 04:28 Post subject: Poudrette Quarry: Carletonite |
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Hello,
It seems important to me to talk about carletonite, this mineral currently flooded in Poudrette quarry, Mont St Hilaire, Quebec.
In addition, the use of the binocular was essential.
Mineral: | Carletonite |
Locality: | Poudrette Quarry, Mont Saint-Hilaire, La Vallée-du-Richelieu RCM, Montérégie, Québec, Canada | |
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17369 Time(s) |
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Mineral: | Carletonite |
Locality: | Poudrette Quarry, Mont Saint-Hilaire, La Vallée-du-Richelieu RCM, Montérégie, Québec, Canada | |
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Viewed: |
17379 Time(s) |
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Mineral: | Carletonite |
Locality: | Poudrette Quarry, Mont Saint-Hilaire, La Vallée-du-Richelieu RCM, Montérégie, Québec, Canada | |
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Description: |
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Viewed: |
17415 Time(s) |
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Mineral: | Carletonite |
Locality: | Poudrette Quarry, Mont Saint-Hilaire, La Vallée-du-Richelieu RCM, Montérégie, Québec, Canada | |
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Description: |
bevel on edge Miller indices ? |
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17335 Time(s) |
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Mineral: | Carletonite |
Locality: | Poudrette Quarry, Mont Saint-Hilaire, La Vallée-du-Richelieu RCM, Montérégie, Québec, Canada | |
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Description: |
with feldspar, microcline ? |
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17389 Time(s) |
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Mineral: | Carletonite |
Locality: | Poudrette Quarry, Mont Saint-Hilaire, La Vallée-du-Richelieu RCM, Montérégie, Québec, Canada | |
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17380 Time(s) |
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Mineral: | Carletonite |
Locality: | Poudrette Quarry, Mont Saint-Hilaire, La Vallée-du-Richelieu RCM, Montérégie, Québec, Canada | |
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Description: |
another prism, a nice classic view |
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17383 Time(s) |
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Roger Warin
Joined: 23 Jan 2013
Posts: 1195
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Posted: Jun 29, 2023 09:06 Post subject: Poudrette Quarry (continued) : Leifite |
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The Poudrette Quarry at Mont-Saint-Hilaire in Quebec is a great exception for mineralogists. Alas, this great quarry complex is now drowned.
This alkaline igneous intrusion is not embedded in a mass of silica (quartz) and many very different silicates could have developed, trapping alkaline cations at a high level and also beryllium. The Si and Al concentrations are low. Quartz is missing.
Leifite is a rare but unusual tectosilicate: it forms the leifite group.
Leifite often occurs as fibroradiated aggregates of hexagonal, colorless or greyish prisms.
Such an aggregate (4cm wide) is found at the foot of the main serandite crystal. He is not very photogenic.
The following pictures show the reverse side of a master piece of serandite, of which we do not pay attention to the whitish gangue of feldspars (albite) pierced with black needles of aegirine.
Mineral: | Leifite with Serandite |
Locality: | Poudrette Quarry, Mont Saint-Hilaire, La Vallée-du-Richelieu RCM, Montérégie, Québec, Canada | |
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Viewed: |
16861 Time(s) |
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Mineral: | Leifite with Serandite |
Locality: | Poudrette Quarry, Mont Saint-Hilaire, La Vallée-du-Richelieu RCM, Montérégie, Québec, Canada | |
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Description: |
another aspect of aggregate |
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16802 Time(s) |
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Mineral: | Leifite on Serandite |
Locality: | Poudrette Quarry, Mont Saint-Hilaire, La Vallée-du-Richelieu RCM, Montérégie, Québec, Canada | |
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Description: |
on serandite crystals, same area with binocular reverse view |
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16809 Time(s) |
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Mineral: | Leifite on Serandite |
Locality: | Poudrette Quarry, Mont Saint-Hilaire, La Vallée-du-Richelieu RCM, Montérégie, Québec, Canada | |
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16772 Time(s) |
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Mineral: | Leifite on Serandite |
Locality: | Poudrette Quarry, Mont Saint-Hilaire, La Vallée-du-Richelieu RCM, Montérégie, Québec, Canada | |
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Description: |
a micro Master piece of leifite |
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16827 Time(s) |
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Mineral: | Albite with Aegirine |
Locality: | Poudrette Quarry, Mont Saint-Hilaire, La Vallée-du-Richelieu RCM, Montérégie, Québec, Canada | |
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16788 Time(s) |
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Roger Warin
Joined: 23 Jan 2013
Posts: 1195
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Posted: Aug 09, 2023 00:13 Post subject: Re: Poudrette Quarry: Carletonite |
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About Poudrette Quarry
I examine again my specimens from Mont St Hilaire, an exceptionally remarkable site, because there is relatively little silicon and so you escape the quartz.
A large sample of analcime from Poudrette Quarry bears crystals of natrolite and rhodochrosite.
On the back side are a few large broken needles of black aegirine (ex acmite). Or arfvedsonite, an amphibole.
While handling the specimen, a small shard broke off. A priori I thought of a burst of rhodochrosite.
In fact, it is a pyroxene, tan in color with strong refractivity and high relief. What is it? I'm thinking aegirine.
Mineral: | Aegirine |
Locality: | Poudrette Quarry, Mont Saint-Hilaire, La Vallée-du-Richelieu RCM, Montérégie, Québec, Canada | |
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Description: |
is it an aegirine ? shot in cross polarized light FOV: 0.45mm |
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15995 Time(s) |
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Roger Warin
Joined: 23 Jan 2013
Posts: 1195
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Posted: Aug 27, 2023 07:32 Post subject: Re: Poudrette Quarry: Carletonite |
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Poudrette Quarry, Mont Saint Hilaire, Quebec.
Continuing to explore cabinet-sized specimens, I observed a curious rhodochrosite. Its habit is that of an iron rose. Mindat does not show this aspect, I think.
One question remains: do you confirm the name of the species?
Mineral: | Analcime |
Locality: | Poudrette Quarry, Mont Saint-Hilaire, La Vallée-du-Richelieu RCM, Montérégie, Québec, Canada | |
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15061 Time(s) |
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Mineral: | Rhodochroriste |
Locality: | Poudrette Quarry, Mont Saint-Hilaire, La Vallée-du-Richelieu RCM, Montérégie, Québec, Canada | |
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14988 Time(s) |
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Mineral: | Rhodochrosite |
Locality: | Poudrette Quarry, Mont Saint-Hilaire, La Vallée-du-Richelieu RCM, Montérégie, Québec, Canada | |
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Dimensions: | FOV ~3 cm |
Description: |
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Viewed: |
15034 Time(s) |
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Tobi
Site Admin
Joined: 07 Apr 2009
Posts: 4187
Location: Germany
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Posted: Aug 27, 2023 08:42 Post subject: Re: Poudrette Quarry: Carletonite |
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Roger Warin wrote: | I observed a curious rhodochrosite. Its habit is that of an iron rose. Mindat does not show this aspect, I think.One question remains: do you confirm the name of the species? | Hi Roger, I can't "confirm" it, but I would not doubt this is rhodochrosite. I have seen rhodos from Poudrette Quarry with a habit like this. And the colour would be also typical for many many Poudrette rhodos.
So for what I know about that locality, yes this could be rhodochrosite without a doubt :-)
Regards
Tobi
P.S. I have to correct you about Mindat, there are several photos that show exactly this kind of rhodo:
https://www.mindat.org/photo-84598.html
https://www.mindat.org/photo-703498.html
https://www.mindat.org/photo-43984.html
https://www.mindat.org/photo-395220.html
and for sure some more ;-)
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Pete Richards
Site Admin
Joined: 29 Dec 2008
Posts: 834
Location: Northeast Ohio
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Posted: Aug 27, 2023 12:58 Post subject: Re: Poudrette Quarry: Carletonite |
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I concur. This is probably rhodochrosite, which was found often at the Poudrette Quarry, including in this habit. Warm hydrochloric acid on a little flake would confirm that it's a carbonate, and that would about rule out any other alternatives. The most likely alternative would be pyrophanite, which occurs in rosettes but with a much more adamantine luster, and of course is not a carbonate.
_________________ Collecting and studying crystals with interesting habits, twinning, and epitaxy |
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Roger Warin
Joined: 23 Jan 2013
Posts: 1195
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Posted: Aug 30, 2023 08:10 Post subject: Re: Poudrette Quarry: Carletonite |
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Thanks Tobi for your insight. These are also beautiful photos.
Thank you Pete for your comments as always relevant.
Although its molecule is simple, I did not know pyrophanite.
Here are some more photos of leifite, before returning to serandite whose crystals are frequently equant and idiomorphic.
I don't really understand the nature of the driving force that leads to fibroradiated aggregates.
Mineral: | Leifite |
Locality: | Poudrette Quarry, Mont Saint-Hilaire, La Vallée-du-Richelieu RCM, Montérégie, Québec, Canada | |
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Viewed: |
14478 Time(s) |
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Mineral: | Leifite |
Locality: | Poudrette Quarry, Mont Saint-Hilaire, La Vallée-du-Richelieu RCM, Montérégie, Québec, Canada | |
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Description: |
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Viewed: |
14550 Time(s) |
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Mineral: | Leifite |
Locality: | Poudrette Quarry, Mont Saint-Hilaire, La Vallée-du-Richelieu RCM, Montérégie, Québec, Canada | |
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Description: |
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Viewed: |
14487 Time(s) |
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Mineral: | Leifite |
Locality: | Poudrette Quarry, Mont Saint-Hilaire, La Vallée-du-Richelieu RCM, Montérégie, Québec, Canada | |
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Description: |
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Viewed: |
14476 Time(s) |
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Mineral: | Leifite |
Locality: | Poudrette Quarry, Mont Saint-Hilaire, La Vallée-du-Richelieu RCM, Montérégie, Québec, Canada | |
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Description: |
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Viewed: |
14482 Time(s) |
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Description: |
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14496 Time(s) |
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Roger Warin
Joined: 23 Jan 2013
Posts: 1195
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Posted: Oct 16, 2023 11:59 Post subject: Re: Poudrette Quarry: Carletonite |
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A little perfection in this quite rare assembly:
Serandite, twin on (110).
The 2 twins of serandite have been wonderfully described by Peter Richards.
R.Peter Richards, “Twin laws for serandite from Mont-Saint-Hilaire, Quebec”
Rocks & Minerals, 66, n°1, p. 44 (1991).
The front faces are not in the same plane
The angle is close to 8°.
Mineral: | Serandite |
Locality: | Poudrette Quarry, Mont Saint-Hilaire, La Vallée-du-Richelieu RCM, Montérégie, Québec, Canada | |
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Description: |
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Viewed: |
11270 Time(s) |
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Mineral: | twin on (110) |
Locality: | Poudrette Quarry, Mont Saint-Hilaire, La Vallée-du-Richelieu RCM, Montérégie, Québec, Canada | |
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Description: |
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11193 Time(s) |
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