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Riebeckite Psm Phlogopite

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LMB547375

Riebeckite Psm Phlogopite

Cubic crystals
Pseudomorph

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Description Tabs

Description
Locality: 
Poudrette Quarry, Mont Saint-Hilaire, Québec, Canada
Class: 
Massive/Crystalline
Size Range: 
Thumbnail (1-3cm)
Size: 
1 × 1 × 1.9 cm
Weight: 
3.00gr
Description

MSH is famous not only for rare minerals, but also for unusual, and downright weird, pseudomorphs. This apparent pseudomorph of riebeckite after phlogopite is unique in my experience. (Caveat: It has not been analyzed.)

The first pair of photos (FOV 6.7 x 4.7 mm) shows the replacement, surrounded by fibrous riebeckite more typical of MSH. Perhaps the riebeckite has simply forced its way in along cleavage or parting planes, but clearly the riebeckite fibers are oriented parallel to the edges of the phlogopite, so if it is simply on top of the phlogopite, then there is a most unusual epitactic relationship here.

The second full-view photo is a side-view showing the phlogopite layers. The riebeckite is on the right.

Single item shipping weight (small box with MM case) is 1.9 oz. Up to a total weight of 8 oz (225 g), this could be combined with other items from this or future auctions for the same postage. If you wish to keep an “open box”, let me know. Please see my "Shipping Policy" for details

Mineral Data
What's on the rock

Riebeckite

Formula: 
◻[Na2][Fe2+3Fe3+2]Si8O22(
Strunz: 
9.DE.25
Hardness: 
5.0 - 5.5
Type Locality: 
Socotra Island, Adan Governorate, Yemen

Phlogopite

Formula: 
KMg3(AlSi3O10)(OH,F)2
Strunz: 
9.EC.20
Crystal System: 
Monoclinic - Prismatic
Hardness: 
2.0 - 3.0
Streak: 
White
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.

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