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Hellandite Group UK 39 Datolite & Pectolite

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LMB196589

Hellandite Group UK 39 Datolite & Pectolite

Rare Mineral

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Description Tabs

Description
Locality: 
Poudrette Quarry, Mont Saint-Hilaire, Québec, Canada
Size Range: 
Thumbnail (1-3cm)
Size: 
1.1 × 1.8 × 0.9 cm
Description

This mineral was long known as tadzhikite-(Ce) at MSH. However, it has not been possible to confirm anything more specific than ‘hellandite group”, so the designation has reverted to “UK 39”. It is a moderately rare mineral at MSH. This is a good example. In the first photo (FOV 4.4 x 6.5 mm), the UK 39 is the deep orange/yellow “rosettes” (to ~ 0.7 mm) in cavities of the pectolite termination.The datolite, an even rarer mineral at MSH, is the tiny white sphere at the very top of the central rosette. (Although well formed crystals of datolite > 1 cm do occur at MSH, they are exceedingly rare.) I don’t know what the dark red/brown blades are. The pectolite on this specimen is actually quite well formed (macro photo) and spans ~ 1.7 cm. But the main crystal is only partial – the back is a cleavage or contact. Nevertheless, it is displayable as is. Weight (inc TN case) 0.3 oz. Single item shipping weight 2.7 oz. Up to 4 oz, this can be combined with other items for the same postage

Mineral Data
What's on the rock

Datolite

Formula: 
Ca(HBSiO5)
Strunz: 
9.AJ.20
Hardness: 
5.0 - 5.5
Streak: 
White
Type Locality: 
Nødebro Mine (Nøddebro), Arendal Iron Mines, Arendal, Aust-Agder, Norway

Pectolite

Formula: 
NaCa2(HSi3O9)
Strunz: 
9.DG.05
Hardness: 
4.5 - 5.0
Streak: 
White
Type Locality: 
Sano, Mori, Mt. Baldo, Lagarina Valley, Trento Province, Trentino-Alto Adige (Trentino-Südtirol), Italy
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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