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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Magnesio-hornblende from
Sneech Pond copper mines (Copper Mine Hill), Cumberland, Providence County, Rhode Island, USA


Locality type:Mine
Classification
Species:Magnesio-hornblende
Formula:◻Ca2(Mg4Al)(Si7Al)O22(OH)2
Confirmation
Validity:Believed Valid
Data
Mineral Data:Click here to view Magnesio-hornblende data
Locality Data:Click here to view Sneech Pond copper mines (Copper Mine Hill), Cumberland, Providence County, Rhode Island, USA
Data Identifiers
Mindat Occurrence Record ID:37222
Long-form Identifier:1:3:37222:6
GUID (UUID V4):0
Nearest other occurrences of Magnesio-hornblende
0.7km (0.4 miles) ⓘBeacon Pole Hill quarry, Cumberland, Providence County, Rhode Island, USA
1.0km (0.6 miles) ⓘIron Mine Hill quarry, Cumberland, Providence County, Rhode Island, USA
1.2km (0.7 miles) ⓘMaple Ridge Drive, Cumberland, Providence County, Rhode Island, USA
1.7km (1.1 miles) ⓘDiamond Hill Granite Company quarry, Diamond Hill, Cumberland, Providence County, Rhode Island, USA
3.1km (1.9 miles) ⓘDiamond Hill, Cumberland, Providence County, Rhode Island, USA
3.6km (2.2 miles) ⓘManville Quarry, Cumberland, Providence County, Rhode Island, USA
8.4km (5.2 miles) ⓘConklin Quarry, Lime Rock, Lincoln, Providence County, Rhode Island, USA
9.1km (5.7 miles) ⓘDexter Quarry (Dexter Lime Quarry), Lime Rock, Lincoln, Providence County, Rhode Island, USA
18.0km (11.2 miles) ⓘSpring Lake, Harrisville, Burrillville, Providence County, Rhode Island, USA
49.7km (30.9 miles) ⓘBolton Lime Quarries (Bolton Quarry; Whitcomb Quarry; Hildreth Quarry), Bolton, Worcester County, Massachusetts, USA
References
AmMin 22:279
 
and/or  
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