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Chalcopyrite With Gobbinsite & Gmelinite-Na

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LMB622801

Chalcopyrite With Gobbinsite & Gmelinite-Na

Very rare at MSH
Analysed

Description Tabs

Description
Locality: 
Poudrette Quarry, Mont Saint-Hilaire, Québec, Canada
Class: 
Crystals on Matrix
Size Range: 
Thumbnail (1-3cm)
Size: 
1.3 × 1.7 × 1 cm
Weight: 
2.00gr
Description

As chalcopyrite goes, this isn’t much of a specimen. But chalcopyrite is a very rare mineral at MSH – less common than sabinaite or horváthite-(Y), and much less common than, say, gaidonnayite. Moreover, the chalcopyrite has been verified via qualitative EDS. (See the “Analysis” tab.) The chalcopyrite is associated with  several nice gobbinsite aggregates, several pretty “rosettes” of gmelinite-Na, and a small donnayite group aggregate - probably intermediate donnayite/mckelveyite-(Y). There is also minor synchysite-(Ce) and sphalerite. These are both very small and insignificant. I had them analyzed, because, at MSH, you just never know what will turn up. I have included the scans.

The first pair of photos (FOV 5.7 x 4.0 mm) shows a nice gobbinsite aggregate (1.55 mm)  in the  center, a gmelinite-Na rosette (1.55 mm) on the right, and crude, encrusted, chalcopyrite crystal (1.85 mm). I thought that the encrustation might be a Cu alteration mineral, but it looks similar to the stuff that turned out to be synchysite-(Ce).

The second pair of photos (FOV 6.8 x 4.7 mm)  shows more of the  chalcopyrite and gmelinite-Na. The somewhat greenish rods in the upper right are the synchysite that was analyzed. The chalcopyrite is partly encrusted by more of the synchysite and partly fractured. It isn’t clear if these were crude crystals or just blobs constrained by the walls of the cavity.

The next photo (FOV 2.2 x 2.3 mm) is a close-up of one of the gobbinsite aggregates. It spans 1.8 m.

The next pair of photos (FOV 3.2 x 2.2 mm) zooms in on a gemlinte rosette 1.6 mm in diameter.

The next photo (FOV5.9 x 4.1 mm) is a  broader view of some of the gobbinsite and gmelinite.

The next photo (FOV 1.6 x 1.2 mm)  is an extreme close-up (equivalent to ca 60X) showing the largest “donnayite group” aggregate. This was not analyzed – they don’t do it for free! – but similar material from a nearby find showed intermediate donnayite-(Y)/mckelveyite-(Y).  Also visible – not too clearly – are some of the stacked sphaleite terahedra (far right).

Single item shipping weight is 2.9 oz (82 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 now varies by destination. For total weights up to 13 oz, it ranges from $4.50  to $7.00 (including packing etc). Above 13 oz (up to 16 oz), I will use “own box” Priority Mail. The rate, including packing, varies from $8 to $10.

Mineral Data
What's on the rock

Chalcopyrite

Formula: 
CuFeS2
Strunz: 
2.CB.10a
Crystal System: 
Tetragonal
Hardness: 
3.5 - 4.0

Gobbinsite

Formula: 
Na4(Ca,Mg,K2)Al6Si10O32·12H2O
Strunz: 
9.GC.05
Hardness: 
4.0
Type Locality: 
Hills Port, Gobbins, Island Magee, Co. Antrim, Northern Ireland, UK

Gmelinite-Na

Formula: 
(Na2,Ca)[Al2Si4O12]·6H2O
Strunz: 
9.GD.05
Crystal System: 
Hexagonal
Hardness: 
4.5
Type Locality: 
Nero Mt., San Pietro, Montecchio Maggiore, Vicenza Province, Veneto, Italy
Analysis
Analysis Report - only: Chalcopyrite With Gobbinsite & Gmelinite-Na
Analysis Report - only: Chalcopyrite With Gobbinsite & Gmelinite-Na
Analysis Report - only: Chalcopyrite With Gobbinsite & Gmelinite-Na

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Shipping Information

Postage Area Price
United States
$4.50
Canada
$11
Europe
$15.25
Rest of World
$15.50

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.

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