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Pyrophanite & Ancylite-(Ce) On Calcite

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LMB605763

Pyrophanite & Ancylite-(Ce) On Calcite

Classic Locality

Description Tabs

Description
Locality: 
Poudrette Quarry, Mont Saint-Hilaire, Québec, Canada
Class: 
Crystals on Matrix
Size Range: 
Thumbnail (1-3cm)
Size: 
2 × 2 × 1.2 cm
Largest Crystal: 
0.11cm
Weight: 
3.00gr
Description

In general, it is not possible to visually distinguish pyrophanite from ilmenite at MSH. But when the crystals are this red, it ain’t ilmenite!

Pyrophanite forms rosettes as large as 3 cm at MSH (see Lapis July/August 2000, p. 61). The crystals on this specimen are much smaller, but very beautiful.

The first photo (FOV 2 x 1.75 mm) shows the nicest crystals on the specimen. The two larger ones are each about 1.1 mm in maximum diameter. Hanging above them, like a tiny chandelier, is a cluster of ancylite-(Ce). These crystals are in a small, fairly deep cavity. It is difficult to get a good angle of view for photography. The next pair of photos (FOV 2.1 x 2.3 mm) is another attempt.

The next pair of photos (FOV 3.0 x 1.85 mm) shows the other pyrophanite aggregate on the specimen. The  main crystal is about 1.15 mm This aggregate probably bigger than the one shown in the first three photos, but it is partly obscured by little “dog-tooth: calcite crystals, some of which can be see in these two photos. They are fairly attractive in their own right.

Also attractive is another aggregate of ancylite-(Ce) growing on the calcite. This is shown in the next pair of photos (FOV2.45 x 2.9 x mm). The individual ancylite  crystals are small – ca 0.9 mm – but quite gemmy and lustrous.

Single item shipping weight (no case) is 3.1 oz (87 g). For shipments outside the USA, up to a total weight < 8 oz (225g), this can be combined with items from this or other auctions for the same postage.

Within the USA, postage increases by about $0.20 per ounce. Above 13 oz, I will use Priority Mail ($9.25 including packing). 

Mineral Data
What's on the rock

Pyrophanite

Formula: 
Mn2+TiO3
Strunz: 
4.CB.05
Hardness: 
5.0 - 6.0
Type Locality: 
Harstigen Mine, Pajsberg, Persberg district, Filipstad, Värmland, Sweden

Ancylite-(Ce)

Formula: 
SrCe(CO3)2(OH)·H2O
Strunz: 
5.DC.05
Crystal System: 
Orthorhombic
Hardness: 
4.0 - 4.5
Streak: 
White
Type Locality: 
Narsaarsuk pegmatite (Narssârssuk pegmatite), Narsaarsuk Plateau, Igaliku (Igaliko), Narsaq, Kujalleq, Greenland

Calcite

Polymorph of: 
Formula: 
CaCO3
Strunz: 
5.AB.05
Crystal System: 
Trigonal
Hardness: 
3.0
Streak: 
White
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.