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Varennesite & Manganoneptunite

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LMB517585

Varennesite & Manganoneptunite

Type Locality

Description Tabs

Description
Locality: 
Demix-Varennes Quarry, Saint-Amable Sill, Québec, Canada
Class: 
Combination
Size Range: 
Thumbnail (1-3cm)
Size: 
2 × 2 × 2 cm
Weight: 
14.00gr
Description

This is an unusual combination: manganoneptunite on varennesite. Of course varennesite is a very rare mineral even at this quarry, which is the type and only known locality. But the specimen is unusual apart from the varennesite because the manganoneptunite appears to have been embedded in the varennesite.

The varenessite on this specimen is not euhedral. As shown in the third photo (FOV 6.2 x 4.0 mm) it is somewhat crumbly. Nonetheless – it is varennesite. And the manganoneptunite crystals are quite nice, though small. FOV in the first pair of photos is 1.3 x 1.8 mm. You will need 15-20X to view these crystals properly. Altogether, the varennesite spans about 11 x 2 mm.

For completeness, there are some very pale pink blades of sérandite (visible just above the manganoneptunite in the third photo – not much to look at), radiating natrolite prisms (bottom of third photo - not terminated), and very small, platy, unidentified pseudomorphs sprinkled with tiny pyrite. Some of the pseudomorphs are visible at top left in the third photo - not exciting.

Single item shipping weight 3.1 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, 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

Varennesite

Formula: 
Na8Mn2Si10O25(OH,Cl)2·12H2O
Strunz: 
9.EE.50
Crystal System: 
Orthorhombic
Hardness: 
4.0
Streak: 
White
Type Locality: 
Demix-Varennes quarry, Saint-Amable sill, Varennes & St-Amable, Lajemmerais RCM, Montérégie, Québec, Canada

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...

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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