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
O'Donoghue's Castle Mine (O'Donohue's Castle Mine), Vulkathunha-Gammon Ranges National Park, Gammon Ranges, Pastoral Unincorporated Area, South Australia, Australia


01935720017363561125462.jpg
Opal-AN, etc.

O'Donoghue's Castle Mine, Vulkathunha-Gammon Ranges National Park, Gammon Ranges, Pastoral Unincorporated Area, South Australia, Australia
01935720017363561125462.jpg
Opal-AN, etc.

O'Donoghue's Castle Mine, Vulkathunha-Gammon Ranges National Park, Gammon Ranges, Pastoral Unincorporated Area, South Australia, Australia
01819210017272730474982.jpg
Opal-AN, etc.

O'Donoghue's Castle Mine, Vulkathunha-Gammon Ranges National Park, Gammon Ranges, Pastoral Unincorporated Area, South Australia, Australia
Locality type:Mine
Classification
Species:Opal
Formula:SiO2 · nH2O
Confirmation
Validity:Believed Valid
Data
Mineral Data:Click here to view Opal data
Locality Data:Click here to view O'Donoghue's Castle Mine (O'Donohue's Castle Mine), Vulkathunha-Gammon Ranges National Park, Gammon Ranges, Pastoral Unincorporated Area, South Australia, Australia
Data Identifiers
Mindat Occurrence Record ID:425487
Long-form Identifier:1:3:425487:4
GUID (UUID V4):0
Nearest other occurrences of Opal
21.1km (13.1 miles) ⓘMt Gee, Arkaroola (Arkaroola Wilderness Sanctuary; Arkaroola Station), Pastoral Unincorporated Area, South Australia, Australia
21.7km (13.5 miles) ⓘMount Painter No. 2 workings, Mount Painter area, Arkaroola (Arkaroola Wilderness Sanctuary; Arkaroola Station), Pastoral Unincorporated Area, South Australia, Australia
26.4km (16.4 miles) ⓘPinnacles Mine, Mount Fitton homestead, Mount Freeling, Pastoral Unincorporated Area, South Australia, Australia
29.3km (18.2 miles) ⓘParalana Hot Springs, Arkaroola (Arkaroola Wilderness Sanctuary; Arkaroola Station), Pastoral Unincorporated Area, South Australia, Australia
References
Pers. Comm. M. Willoughby. Found on specimen with Olivenite. Collection of M. Willoughby.
 
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