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Strontianite & Dolomite

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LMB178047

Strontianite & Dolomite

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Description
Locality: 
Poudrette Quarry, Mont Saint-Hilaire, Québec, Canada
Size Range: 
Small miniature (3-4.5 cm)
Size: 
2 × 3 × 2 cm
Description

Strontianite is not a rare mineral, but it is uncommon at MSH and this is a very good example for the locality. No doubt better specimens exist, but I found it on my first trip to the quarry in May 1994, and never found anything nearly as good in the next ten years. So this stuff doesn’t just lie around waiting to be picked up.

The close-up photos show two areas 6.7 x 4.5 mm and 5.5 x 4.2 mm resp. covered by strontianite needles up to 1.1 mm along with greenish-tan dolomite rhombs to 1.3 mm on edge. There are several other sprays on the specimen. There are two micaceous associated minerals, one a “ruddy tan”, the other “clinochlore green”, both occurring in rostttes. The tan stuff is probably muscovite. I don’t know what the green stuff is. I don’t think it’s “supposed” to be in this environment (a seam in hornfels near the Poudrette pegmatite).

Weight (including case) 0.7 oz. Single item shipping weight 2.7 oz. Up to a total weight < 4 oz, this can be combined with other items for the same postage.

Mineral Data
What's on the rock

Strontianite

Formula: 
SrCO3
Strunz: 
5.AB.15
Crystal System: 
Orthorhombic
Hardness: 
3.5
Streak: 
White
Type Locality: 
Strontian, North West Highlands (Argyllshire), Scotland, UK

Dolomite

Formula: 
CaMg(CO3)2
Strunz: 
5.AB.10
Crystal System: 
Trigonal - Rhombohedral
Hardness: 
3.5 - 4.0
Streak: 
White
LMB minerals

Seller Information

Payment options: offline, paypal_wpp, paypal_wps

Seller's terms and conditions

In addition to the standard terms and conditions, please note the following. Almost all IDs are visual. While in most cases the ID is obvious, there may be cases where it is not. If you are doubtful about a particular ID, please ask for more information. Or do not bid! Similarly, if you are not sure that the specimen meets your criteria, do not bid. I have tdone the best I can with the photos. Nevertheless, if you are not happy with a specimen for any reason, I will refund the bid price – but not the shipping costs (unless the fault is clearly mine) – if the specimen is returned. This policy applies even if analysis of the specimen shows that my ID was incorrect. When in doubt, ask - or don’t bid. Note that most crystals at MSH and Varennes are micros - even if on large specimens. Please pay attention to the stated sizes. Any customs duties, fees etc. are the responsibility of the buyer.

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