Vote for your favorite mineral in #MinCup26! - Sphalerite vs. Anorthite
Both zinc ore Sphalerite and calcium plagioclase feldspar Anorthite have perfect cleavage that will split cleanly if you hit them with a hammer, but only one can claim a larger split of your votes!
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Opal from
Bigay Mine, Lachaux, Thiers, Puy-de-Dôme, Auvergne-Rhône-Alpes, France


05563570017367612228679.jpg
Opal, etc.

Bigay Mine, Lachaux, Thiers, Puy-de-Dôme, Auvergne-Rhône-Alpes, France
05563570017367612228679.jpg
Opal, etc.

Bigay Mine, Lachaux, Thiers, Puy-de-Dôme, Auvergne-Rhône-Alpes, France
03695410017367612232050.jpg
Opal, etc.

Bigay Mine, Lachaux, Thiers, Puy-de-Dôme, Auvergne-Rhône-Alpes, France
Locality type:Mine
Classification
Species:Opal
Formula:SiO2 · nH2O
Confirmation
Validity:Believed Valid
Associated Minerals Based on Photo Data:
Torbernite2
Metatorbernite1
Data
Mineral Data:Click here to view Opal data
Locality Data:Click here to view Bigay Mine, Lachaux, Thiers, Puy-de-Dôme, Auvergne-Rhône-Alpes, France
Data Identifiers
Mindat Occurrence Record ID:73707
Long-form Identifier:1:3:73707:0
GUID (UUID V4):0
Nearest other occurrences of Opal
0.8km (0.5 miles) ⓘGourniaud Mine, Lachaux, Thiers, Puy-de-Dôme, Auvergne-Rhône-Alpes, France
3.6km (2.2 miles) ⓘRoffin Mine, Lachaux, Thiers, Puy-de-Dôme, Auvergne-Rhône-Alpes, France
3.7km (2.3 miles) ⓘEtang de Reliez, Lachaux, Thiers, Puy-de-Dôme, Auvergne-Rhône-Alpes, France
4.2km (2.6 miles) ⓘGagnol Mine, Ris, Thiers, Puy-de-Dôme, Auvergne-Rhône-Alpes, France
4.3km (2.7 miles) ⓘReliez, Ris, Thiers, Puy-de-Dôme, Auvergne-Rhône-Alpes, France
5.1km (3.2 miles) ⓘBancherelle Mine, Ris, Thiers, Puy-de-Dôme, Auvergne-Rhône-Alpes, France
36.4km (22.6 miles) ⓘChamp des Poix mine, Pont-du-Château, Clermont-Ferrand, Puy-de-Dôme, Auvergne-Rhône-Alpes, France
37.8km (23.5 miles) ⓘPuy du Mur Quarry, Mur-sur-Allier, Clermont-Ferrand, Puy-de-Dôme, Auvergne-Rhône-Alpes, France
43.2km (26.8 miles) ⓘPuy de la Poix, Clermont-Ferrand, Clermont-Ferrand, Puy-de-Dôme, Auvergne-Rhône-Alpes, France
44.5km (27.6 miles) ⓘPuy de Crouel, Clermont-Ferrand, Clermont-Ferrand, Puy-de-Dôme, Auvergne-Rhône-Alpes, France
References
J.-J. Périchaud: "Où trouver les minéraux d'Auvergne", Vol. 1, Editions l'Instant Durable (Clermont-Ferrand), 1985, p. 92
 
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