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Villiaumite

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LMB568747

Villiaumite

Classic Locality

Description Tabs

Description
Locality: 
Poudrette Quarry, Mont Saint-Hilaire, Québec, Canada
Class: 
Crystals on Matrix
Size Range: 
Thumbnail (1-3cm)
Size: 
1.2 × 2.9 × 2.4 cm
Largest Crystal: 
0.14cm
Weight: 
3.00gr
Description

Villiaumite is rare at MSH except in the very uncommon sodalite xenolith environment. . Most of the villiaumite found here is massive, but some excellent crystals have been found. The ones on this specimen are small and some are rounded, but they appear to be genuine crystals, rather than the result of cleavage. (Villiaumite has perfect cleavage, so it can be quite difficult to distinguish cleavage fragments from real crystals. It is also readily soluble in water and toxic. It’s a halide – but don’t try to taste this “salt”!))

The first pair of photos (FOV 4.1 x 5.5 mm) shows the sharpest, and perhaps largest, crystal on the specimen. It measures 1.4 across the top face/

The second pair of photos (FOV 4.3 x 6.2 mm) shows the largest group of crystals on the specimen. The edges on the crystals near center are ca 0.7 mm. The white stuff is probably thermonatrite, but it may be “post-mining” rather than primary.

It may be helpful to see these photos in stereo. See Mindat under minID QCV-DQ3.

Singe item (small box) shipping weight 2.4 oz. For shipments outside the USA, up to a total weight of 8 oz (225 g), this could be combined with other items from this or future auctions for the same postage. If you wish to keep an “open box”, let me know.

For shipments within the USA, there is a nominal increase of about $0.20 for each additional ounce. Above 13 oz I will use “own box” Priority Mail ($8.75). 

Mineral Data
What's on the rock

Villiaumite

Formula: 
NaF
Strunz: 
3.AA.20
Crystal System: 
Isometric
Hardness: 
2.0 - 2.5
Streak: 
White
Type Locality: 
Rouma Island (Roume Island; Roma Island; Ruma Island), Los Archipelago (Los Islands), Guinea
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.