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Aegirine With Jarosite


Aegirine With Jarosite


Description Tabs

Demix-Varennes Quarry, Varennes & St-Amable, Montérégie, Québec, Canada
Crystals on Matrix
Size Range: 
Small miniature (3-4.5 cm)
3.5 × 4 × 3 cm

This specimen features attractively iridescent aegirine needles along with small “rusty” hexagonal plates that may be jarosite in part. (See the “Analysis” tab.) Aegirine is very common at this quarry, but these needles are unusually “robust”. Jarosite is rare here – but that may be due the difficulty of visual identification. In the absence of distinct crystals, the EDS scan is just suggestive – not definitive.

The first pair of photos (FOV 4.55 x 6.2 mm) shows aegirine needles to ca 2.0 mm.

The second pair of photos (FOV 6.8 X 4.55 mm) shows aegirine blades to ca 2.5 mm along with some aegirine “urchins”  more typical of the quarry. The urchins are ca 1.25 mm in diameter.

The third pair of photos (FOV 2.4 x 3.6 mm) shows most of the “rusty” hexagonal plates. Superficially, the plates resemble "rusty" plates of PSMs after pyrrhitite that are sometimes found here. But I don't think that's the case here. How they came to be jarosite – even in part – is a mystery to me. Interesting nonetheless.

Single item shipping weight (no case) is 3.9 oz (111 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 for total weights up to 13 oz ranges from $4.25 to $6.50 (including packing etc) regardless of destination. Above 13 oz, I will use “own box” Priority Mail. The rate, including packing, varies by destination from $7.25 to $9.50.



Mineral Data
What's on the rock


Group Parent: 
Clinopyroxene Subgroup
Crystal System: 
Type Locality: 
Rundemyr, Øvre Eiker, Buskerud, Norway


KFe3+ 3(SO4)2(OH)6
Crystal System: 
Trigonal - Pyramidal Class
2.5 - 3.5
Type Locality: 
Jaroso Ravine, Sierra Almagrera, Cuevas del Almanzora (Cuevas de Vera), Almería, Andalusia, Spain
Analysis Report - only: Aegirine With Jarosite
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.