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
Heath Quarry, Casco, Cumberland County, Maine, USA


00490890017363229615129.jpg
Opal-AN

Heath Quarry, Casco, Cumberland County, Maine, USA
04157900017272034738388.jpg
Opal-AN

Heath Quarry, Casco, Cumberland County, Maine, USA
00490890017363229615129.jpg
Opal-AN

Heath Quarry, Casco, Cumberland County, Maine, USA
04157900017272034738388.jpg
Opal-AN

Heath Quarry, Casco, Cumberland County, Maine, USA
00490890017363229615129.jpg
Opal-AN

Heath Quarry, Casco, Cumberland County, Maine, USA
04157900017272034738388.jpg
Opal-AN

Heath Quarry, Casco, Cumberland County, Maine, USA
Locality type:Quarry
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 Heath Quarry, Casco, Cumberland County, Maine, USA
Data Identifiers
Mindat Occurrence Record ID:995697
Long-form Identifier:1:3:995697:1
GUID (UUID V4):0
Nearest other occurrences of Opal
17.5km (10.9 miles) ⓘMaine Feldspar Quarry, East Mount Apatite Mining District, Auburn, Androscoggin County, Maine, USA
29.7km (18.4 miles) ⓘEstes Quarry, West Baldwin, Baldwin, Cumberland County, Maine, USA
29.9km (18.6 miles) ⓘMount Mica Quarry, Paris, Oxford County, Maine, USA
32.7km (20.3 miles) ⓘBennett Quarry, Buckfield, Oxford County, Maine, USA
32.8km (20.4 miles) ⓘRyerson Hill Quarries, Paris, Oxford County, Maine, USA
35.2km (21.9 miles) ⓘHayes Ledge Quarries (East and West), Greenwood, Oxford County, Maine, USA
35.3km (21.9 miles) ⓘHeikkinen Quarry, Greenwood, Oxford County, Maine, USA
39.9km (24.8 miles) ⓘEmmons Quarry, Uncle Tom Mountain, Greenwood, Oxford County, Maine, USA
40.6km (25.2 miles) ⓘYedlin Locality, Standpipe Hill Quarries, Topsham, Sagadahoc County, Maine, USA
42.3km (26.3 miles) ⓘWilliam Willes #1 Quarry, Topsham, Sagadahoc County, Maine, USA
References
Cristofono, Peter (n.d.) Personal communication.
 
and/or  
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