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Thornasite

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LMB523147

Thornasite

Rare Mineral

Description Tabs

Description
Locality: 
Demix-Varennes Quarry, Varennes & St-Amable, Montérégie, Québec, Canada
Class: 
Crystals on Matrix
Size Range: 
Thumbnail (1-3cm)
Size: 
1.4 × 1.9 × 1.1 cm
Largest Crystal: 
0.06cm
Weight: 
3.00gr
Description

There are only three known localities for thornasite. It is rare at all three. MSH is the TL, but the best specimens probably come from this quarry (Demix-Varennes) and Aris. This is the only specimen that I have. It is from a find analytically verified (XRD) by Excalibur. (You get the original label.)

FOV in the first photo is 2.0 x 1.7 mm. The largest crystal is about 0.6 mm long. You will need 30-40X to view it. The backround in the photo consists of terminations of grayish natrolite crytals.

The next two photos (FOV 1.3 x 1.6 mm) is another view of the same crystals. The color balance is probably less accurate here.

The last pair of close-up photos (FOV 0.8 x 0.9 mm) was taken several years ago. The color balance is way off and the raw photos were basically all chromatic aberration due to the high magnification. These are not good photos seven after massive Photoshop intervention, but they do show the morphology fairly clearly.

Small as the thornasite crystals are, they are nevertheless visible in the full-view macro photo.

Single item shipping weight is 2.8 oz. If you are planning to hold an "open box" so as to reduce postage costs by combining items from a future auction, please note that USPS postage rates recently changed significantly.

Outside the USA, the stated postage and packing rate applies up to a total weight of 8 oz (225 g). It is no longer possible to save on postage by using a padded envelope.

Within the USA, there is a nominal increase of $0.20 for each additional ounce. Above 13 oz, I will use Priority Mail. Up to 16 oz, the “own box” Priority rate is $8.50 (including packing).

Please see my "Shipping Policy" for details. 

Mineral Data
What's on the rock

Thornasite

Formula: 
(Na,K)12Th3[Si8O19]4·18H2O
Strunz: 
9.GF.50
Hardness: 
0.0
Type Locality: 
Poudrette quarry (Demix quarry; Uni-Mix quarry; Desourdy quarry; Carrière Mont Saint-Hilaire), Mont Saint-Hilaire, La Vallée-du-Richelieu RCM, Montérégie, Québec, Canada
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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