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Arsenopyrite

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LMB616211

Arsenopyrite

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Description Tabs

Description
Locality: 
Poudrette Quarry, Mont Saint-Hilaire, Québec, Canada
Class: 
Crystals on Matrix
Size Range: 
Thumbnail (1-3cm)
Size: 
1.3 × 2 × 1.5 cm
Largest Crystal: 
0.12cm
Weight: 
3.00gr
Description

Arsenopyrite is a rare mineral at MSH. This sample was labeled “löllingite”, but the diamond crross-sections and general shape made me suspicious. Sure enough, EDS says “arsenopyrite” – see the “Analysis" tab. (This illustrates the power of “wishful thinking”: arsenopyrite is rare, llöllingite is rarer, therefore ...) In any case, this is a good example of arsenopyrite from MSH.

FOV in the first pair of photos is 2.2 x 3.2 mm. The large crystal is ca 1.1 mm long. The arsenopyrite is embedded in blue sodalite. Note the “pyrite-like” tarnish.

The third photo shows more of the aresenopyrite (and the blue sodalite). The large crystal here is ca 1.2 mm long. Smaller crystals are sprinkled throughout the matrix.

Single item shipping weight (with TN case) is 3.2 oz (90 g). For shipments outside the USA, up to a total weight < 8 oz (225g), this can be combined with items from this or other auctions for the same postage.

Within the USA, postage increases by about $0.20 per ounce. Above 13 oz, I will use Priority Mail (ca $9.25 including packing – varies by destination). 

Mineral Data
What's on the rock

Arsenopyrite

Formula: 
FeAsS
Strunz: 
2.EB.20
Crystal System: 
Monoclinic
Hardness: 
5.5 - 6.0
Analysis
Analysis Report - only: Arsenopyrite
LMB minerals

Seller Information

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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.