Moving mountains for you
Switch currency

Current Live Auctions

Current Live Fixed Price Sales

Opal On Zircon Siderite Fluorite & Analcime

Views:
Watches:
LMB617019

Opal On Zircon Siderite Fluorite & Analcime

Very rare at MSH
Classic Locality

Share this by email

Description Tabs

Description
Locality: 
Poudrette Quarry, Mont Saint-Hilaire, Québec, Canada
Class: 
Combination
Size Range: 
Thumbnail (1-3cm)
Size: 
1.3 × 1.7 × 1.5 cm
Weight: 
4.00gr
Description

Opal is a very rare mineral at MSH. This example is from a pegmatite that was near or a part of the Poudrette pegmatite complex. It is one of the two small specimens that I ever found here. 
The opal consists of  glass-clear “droplets” ca 0.3 mm in diameter and has a green SW UV response – typical of opal. While the opal is actually colorless, in the photos it sometimes takes on the color of the background minerals which include yellow zircon, olive siderite, purple fluorite, and colorless to white analcime. There are three pairs of close-up photos (FOV 3.3 x 2.4, 2.4 x 3.2, 2.2 x 3.6 mm  resp.) The opal is always the same, but the background varies. (The background minerals are not distinctive.)

Single item shipping weight (no case) is 3.0 oz (84 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 (ca $9.25 including packing – varies by destination). 

Mineral Data
What's on the rock

Opal

Formula: 
SiO2·nH2O
Strunz: 
4.DA.10
Hardness: 
5.5 - 6.5
Streak: 
White

Zircon

Formula: 
ZrSiO4
Strunz: 
9.AD.30
Crystal System: 
Tetragonal
Hardness: 
7.5
Streak: 
White

Siderite

Formula: 
FeCO3
Strunz: 
5.AB.05
Crystal System: 
Trigonal
Hardness: 
3.5 - 4.5
Streak: 
White

Fluorite

Formula: 
CaF2
Strunz: 
3.AB.25
Crystal System: 
Isometric
Hardness: 
4.0
Streak: 
White
Type Locality: 
Jáchymov (St Joachimsthal), Jáchymov District (St Joachimsthal), Krušné Hory Mts (Erzgebirge), Karlovy Vary Region, Bohemia (Böhmen; Boehmen), Czech Republic

Analcime

Formula: 
Na2(Al2Si4O12)·2H2O
Strunz: 
9.GB.05
Crystal System: 
Triclinic
Hardness: 
5.0 - 5.5
Streak: 
White
Type Locality: 
Cyclopean Islands, Acitrezza (Aci Trezza), Etna Volcanic Complex, Catania Province, Sicily, Italy
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.

Item Toolbox