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Rutile Psm Ilmenite & Albite

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LMB523933

Rutile Psm Ilmenite & Albite

Pseudomorph

Description Tabs

Description
Locality: 
Poudrette Quarry, Mont Saint-Hilaire, Québec, Canada
Class: 
Crystals on Matrix
Size Range: 
Thumbnail (1-3cm)
Size: 
1.4 × 2.5 × 1.5 cm
Weight: 
9.00gr
Description

MSH is well known for numerous strange and unusual pseudomorphs. This specimen features dark bronzy iridescent “pancakes” of rutile, supposedly after ilmenite, from a pegmatite. (I don’t know if has been conclusively proven that ilmenite was the precursor. There seems to be no relict ilmenite in any of these that I have seen, and ilmenite itself has not been reported from the pegmatites here.)

In the first close-up photo (FOV 5.7 x 4.1 mm) the rutile spans 3.8 mm EW. I’m not sure just how many “pancakes” there are, but there are at least two or three stacked one on top of each other, and each of these may actually be a side-by-side pair. It’s not clear if the white albite in the middle is growing on top of the “pancakes” or if it is separating two different stacks.

The next pair of photos (FOV 3.1 x 2.4 mm) is a close-up of one of the “pancake stacks”. It spans ca 2.3 mm. Unfortuantely I wasn’t able to capture the iridescent dark bronzy luster as well as in the first photo. The rutile looks a bit too much like brown “mush” here.

Such rutile pseudomorphs are “medium rare” – not really rare but not really common either – in the pegmatite environment. Individual rutile crystals are very small – in this case about 0.1mm at most. You will need 30-50X to discern them as individuals.

In addition to the rutile and albite, there are some small olive siderite crystals (not shown).

Single item shipping weight is 3.0 oz. Outside the USA, the stated postage and packing rate applies up to a total weight of 8 oz (225 g).

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

Rutile

Formula: 
TiO2
Strunz: 
4.DB.05
Crystal System: 
Tetragonal - Ditetragonal Dipyramidal
Hardness: 
6.0 - 6.5
Type Locality: 
Rutile locality, Horcajuelo de la Sierra, Madrid, Spain

Ilmenite

Formula: 
Fe2+TiO3
Strunz: 
4.CB.05
Crystal System: 
Trigonal - Rhombohedral
Hardness: 
5.0 - 6.0
Type Locality: 
Ilmen Natural Reserve, Ilmen Mts, Chelyabinsk Oblast', Southern Urals, Urals Region, Russia...

Albite

Formula: 
NaAlSi3O8
Strunz: 
9.FA.35
Crystal System: 
Triclinic
Hardness: 
6.0 - 6.5
Streak: 
White
Type Locality: 
Finnbo (Finbo), Falun, Dalarna, Sweden

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Shipping Information

Postage Area Price
United States
$4.50
Canada
$11
Europe
$15.25
Rest of World
$15.50

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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