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Leucosphenite Steacyite & Narsarsukite

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LMB503584

Leucosphenite Steacyite & Narsarsukite

Ex Jean-Pierre Beckerich and Gilles Haineault
Type Locality

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

This specimen has excellent leucosphenite, extremely unusual tabular steacyite, and some bright yellow cleavages of narsarsukite. FOV in the first photo is 6.5 x 4.5 mm; 4.4 x 3.8 mm in the second photo; 4.7 x 5.7 in the third phopto; 2.4 x 3.4 mm in the fourth and fifth photos (steacyite); 7.0 x 4.4 mm in the sixth photo (narsarsukite and more steacyite).

The only minus for this specimen is that the leucosphenite faces into the breccia cavity. However, as can bee seen in the last (macro) photo, it is right at the top of the cavity and is easily visible. There is lots of “action” here, but you will need 15X to see things clearly.

Single item shipping weight (with thumbail case) 2.9 oz. Above a total shipping weight of 4 oz, there may be a nominal increase in postage. The specimen just barely fits in a MM box. Possibly it could be sent that way in a padded envelope for $7. (This only makes sense for buyers outside the USA.)

 

Mineral Data
What's on the rock

Leucosphenite

Formula: 
BaNa4Ti2B2Si10O30
Strunz: 
9.DP.15
Hardness: 
6.0 - 6.5
Type Locality: 
Narsaarsuk pegmatite (Narssârssuk pegmatite), Narsaarsuk Plateau, Igaliku (Igaliko), Narsaq, Kujalleq, Greenland

Steacyite

Formula: 
(◻,K)(Na,Ca)2(Th,U)[Si8O20]
Strunz: 
9.CH.10
Hardness: 
5.0
Type Locality: 
Poudrette quarry (Demix quarry; Uni-Mix quarry; Desourdy quarry; Carrière Mont Saint-Hilaire), Mont Saint-Hilaire, La Vallée-du-Richelieu RCM, Montérégie, Québec, Canada

Narsarsukite

Formula: 
Na4(Ti,Fe)2[Si8O20](O,OH,F)2
Strunz: 
9.DJ.05
Hardness: 
7.0
Type Locality: 
Narsaarsuk pegmatite (Narssârssuk pegmatite), Narsaarsuk Plateau, Igaliku (Igaliko), Narsaq, Kujalleq, Greenland
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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