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Gmelinite Na Strontianite & Dolomite

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LMB168343

Gmelinite Na Strontianite & Dolomite

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Description Tabs

Description
Locality: 
Poudrette Quarry, Mont Saint-Hilaire, Québec, Canada
Size Range: 
Small miniature (3-4.5 cm)
Size: 
2 × 3 × 1.2 cm
Largest Crystal: 
0.23cm
Description

Ignore the size. This is essentially a micro. You will need 10-20X to view the xls. The main xl in the first photo is 2¼ mm in width. It looks - at best - translucent, because of the reflections and a very light coating. (I used these in the photo to bring out the shapes and structure.) Viewed down the axis, the xl is completely transparent and you can see the thicker coating on the “back” right through the xl. The xls are colorless, but the tan color of the under-laying dolomite shows through as well. The second photo (FOV 4.3 x 6.8 mm) shows a few more of the gmelinite xls as well as some strontianite (lower right). The xl in the center is 1.6 mm wide. There are a total of five gmelinite groups in the photo, but some are hard to spot. Gmelinite is common at MSH, but it is usually colored (olive, yellow, orange, red, black, …). These colorless xls are somewhat unusual here. Strontianite, on the other hand, is uncommon (but there is not much of it on this specimen). Weight 0.4 oz.

Mineral Data
What's on the rock

Gmelinite

Synonym Of: 

Gmelinite-Ca

Formula: 
(Ca,Na2)[Al2Si4O12]·6H2O
Strunz: 
9.GD.05
Hardness: 
4.5

Gmelinite-K

Formula: 
(K2,Na2,Ca)[Al2Si4O12]·6H2O
Strunz: 
9.GD.05
Hardness: 
4.5

Gmelinite-Na

Formula: 
(Na2,Ca)[Al2Si4O12]·6H2O
Strunz: 
9.GD.05
Hardness: 
4.5
Group Parent: 
Zeolite Group

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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