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
Aggregate Industries Quarry (Wrentham Quarry; Simeone Quarry), Wrentham, Norfolk County, Massachusetts, 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 Aggregate Industries Quarry (Wrentham Quarry; Simeone Quarry), Wrentham, Norfolk County, Massachusetts, USA
Data Identifiers
Mindat Occurrence Record ID:37369
Long-form Identifier:1:3:37369:6
GUID (UUID V4):0
Nearest other occurrences of Opal
5.7km (3.5 miles) ⓘGrants Mills, Cumberland, Providence County, Rhode Island, USA
6.1km (3.8 miles) ⓘDiamond Hill Granite Company quarry, Diamond Hill, Cumberland, Providence County, Rhode Island, USA
7.8km (4.9 miles) ⓘSneech Pond copper mines (Copper Mine Hill), Cumberland, Providence County, Rhode Island, USA
7.9km (4.9 miles) ⓘBeacon Pole Hill quarry, Cumberland, Providence County, Rhode Island, USA
8.5km (5.3 miles) ⓘIron Mine Hill quarry, Cumberland, Providence County, Rhode Island, USA
14.1km (8.8 miles) ⓘConklin Quarry, Lime Rock, Lincoln, Providence County, Rhode Island, USA
24.7km (15.3 miles) ⓘAggregate Industries Quarry (Bayer-Mingolla Quarry; Trimount Quarry), Ashland, Middlesex County, Massachusetts, USA
25.7km (16.0 miles) ⓘIde's Ledge quarry, East Providence, Providence County, Rhode Island, USA
26.6km (16.5 miles) ⓘInterstate 295 / US Route 6 road cuts, Johnston, Providence County, Rhode Island, USA
31.2km (19.4 miles) ⓘWest Roxbury Crushed Stone Quarry (West Roxbury Trap Rock Co. Quarry; Grove St. Quarry), West Roxbury, Boston, Suffolk County, Massachusetts, USA
References
 
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