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Eudialyte Group With Titanite & Molybdenite

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LMB634045

Eudialyte Group With Titanite & Molybdenite

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Description Tabs

Description
Locality: 
Poudrette Quarry, Mont Saint-Hilaire, Québec, Canada
Class: 
Crystals on Matrix
Size Range: 
Miniature (4.5-7 cm)
Size: 
4 × 4.5 × 3 cm
Largest Crystal: 
0.15cm
Weight: 
65.00gr
Description

This specimen is from a find that produced khomyakovite, manganokhomyakovite and ferrokentbrooksite (all verified via WDS). However, most crystals were found to be zoned, with ferrokentbrooksite cores and khomyakovite or manganokhomyakovite shells – or just plain ferrokentbrooksite alone. It is impossible to distinguish the various possibilities visually.

A qualitative EDS scan for this sample shows the presence of W. (See the “Analysis” tab.) The W peak may not look very impressive, but, according to the analyst, the high energy peak of W is relatively hard to detect with his equipment , so it is actually “significant”. (The low energy W peak is “buried” under the Si peak.) If the W is in the proper structural site and there is enough of it, this could be khomyakovite. If not, it is probably ferrokentbrooksite. EDS is not sufficient to decide. WDS – very expensive – would be needed. Khomyakovite is extremely rare. Ferrokentbrooksite – not so much.

Of the half dozen or so specimens from this find which I was fortunate enough to have properly analyzed, about half had khomyakovite or manganokhomyakovite, the rest only ferrokentbrooksite. If you think of this as a lottery ticket, that’s pretty good odds. But it isn’t a guarantee.

The specimen features several small, but well formed crystals to about 1.5 mm. You will need 15-20X to view them clearly.

The first photo (FOV 4.0 x 4.5 mm) shows a group of  crystals, the largest 1.5 mm long, spanning a bit  < 2 mm altogether.

These same crystals are shown in the next pair of photos (FOV 4.9 x 4.5 mm). The black needle is an amphibole (probably actinolite-tremolite series.) The tiny white crystals are natrolite. The black stuff is molybdenite seen nearly edge on. The matrix is feldspar – probably albite.

As shown in the fourth photo (FOV 4.3 x 6.0 mm), there are also numerous small, but attractive, titanite crystals and small, but very sharply formed, amphibole crystals (likely actinolite-tremolite). The EGM crystal in this photo is about 1.3 mm in diameter.

The fifth photo shows a pair of crystals 1.4 mm in diameter. One or both appear to be irregular or dinged.

Single item shipping weight (with case) is 5.8 oz (164 g). Outside the USA, the stated postage and packing rate applies up to a total weight of 8 oz (225 g).

Within the USA, postage for total weights up to 13 oz ranges from $4.50 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.

See my updated “Shipping Policy” for details

Mineral Data
What's on the rock

Titanite

Formula: 
CaTi(SiO4)O
Strunz: 
9.AG.15
Hardness: 
5.0 - 5.5
Streak: 
White
Type Locality: 
Titanite occurrence, Hauzenberg, Lower Bavaria, Bavaria, Germany

Molybdenite

Formula: 
MoS2
Strunz: 
2.EA.30
Crystal System: 
Hexagonal
Hardness: 
1.0 - 1.5
Analysis
Analysis Report - only: Eudialyte Group With Titanite & Molybdenite
Analysis Report - only: Eudialyte Group With Titanite & Molybdenite
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.