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Manganoneptunite

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LMB169754

Manganoneptunite

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Description
Locality: 
Demix-Varennes Quarry, Varennes & St-Amable, Montérégie, Québec, Canada
Size Range: 
Thumbnail (1-3cm)
Size: 
1.6 × 2.1 × 0.9 cm
Description

This is a micro. The center xl in the main photo measures 0.7 across the top. You will need 30X to see it as in the photo.

Manganoneptunite is common in the sill and is almost always well formed but nearly black. This specimen has numerous xls, but they are all small and some are broken. The environment is an altered miarolitic cavity with microcline and corroded analcime. Consequently, the manganoneptunite is not as lustrous as is typical of the sill. But it is a lot of manganoneptrunite for the lo0cality. All of the dark stuff in the macro photo is manganoneptunite (not aegirine).

The white plates are microcline and the background is nondescript analcime with embedded glassy natrolite.

Weight 0.1 oz. Single item shipping weight 2.8 oz. Up to 4 oz, this can be combined with other items for the same postage.

Mineral Data
What's on the rock

Manganoneptunite

Formula: 
Na2KLi(Mn2+,Fe2+)2Ti2[Si8O24]
Strunz: 
9.EH.05
Crystal System: 
Monoclinic
Hardness: 
5.0 - 6.0
Colour: 
Red
Type Locality: 
Maly Mannepakhk Mt (Malyi Mannepakhk Mt), Khibiny Massif, Kola Peninsula, Murmanskaja Oblast', Northern Region, Russia...
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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