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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Stilbite Subgroup from
Blueberry Mountain Quarry (Blueberry Hill), Woburn, Middlesex County, Massachusetts, USA


Locality type:Quarry
Classification
Species:'Stilbite Subgroup' (not an IMA approved species)
Formula:M6-7[Al8-9Si27-28O72] · nH2O
Confirmation
Validity:Believed Valid
Data
Mineral Data:Click here to view Stilbite Subgroup data
Locality Data:Click here to view Blueberry Mountain Quarry (Blueberry Hill), Woburn, Middlesex County, Massachusetts, USA
Data Identifiers
Mindat Occurrence Record ID:96412
Long-form Identifier:1:3:96412:4
GUID (UUID V4):0
Nearest other occurrences of Stilbite Subgroup
10.4km (6.4 miles) ⓘGranite Street Quarry (Milk Row Quarry), Somerville, Middlesex County, Massachusetts, USA
23.0km (14.3 miles) ⓘWest Roxbury Crushed Stone Quarry (West Roxbury Trap Rock Co. Quarry; Grove St. Quarry), West Roxbury, Boston, Suffolk County, Massachusetts, USA
28.7km (17.9 miles) ⓘPJ Keating Quarry (Dracut Quarry; Condon Quarry; Essex Bituminous), Dracut, Middlesex County, Massachusetts, USA
36.9km (22.9 miles) ⓘMarlborough Junction locality, Marlborough, Middlesex County, Massachusetts, USA
38.7km (24.0 miles) ⓘAggregate Industries Quarry (Bayer-Mingolla Quarry; Trimount Quarry), Ashland, Middlesex County, Massachusetts, USA
39.5km (24.5 miles) ⓘRoute 111 bypass road cut, Windham, Rockingham County, New Hampshire, USA
55.2km (34.3 miles) ⓘRoute 101/101A road cuts, Amherst, Hillsborough County, New Hampshire, USA
58.5km (36.3 miles) ⓘSneech Pond copper mines (Copper Mine Hill), Cumberland, Providence County, Rhode Island, USA
59.1km (36.7 miles) ⓘBallard Quarry, Worcester, Worcester County, Massachusetts, USA
60.9km (37.9 miles) ⓘBlackstone Valley shopping center site, Millbury, Worcester County, Massachusetts, USA
References
Richmond, W. E. (1937) Paragenesis of the minerals from Blueberry Mountain, Woburn, Massachusetts. American Mineralogist, 22 (4) 290-300
 
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