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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Prehnite from
Mount Tom Quarry, Mount Tom, Holyoke, Hampden County, Massachusetts, USA


02638480017362436839148.jpg
Prehnite, etc.

Mount Tom Quarry, Mount Tom, Holyoke, Hampden County, Massachusetts, USA
07479380017272040066316.jpg
Prehnite, etc.

Mount Tom Quarry, Mount Tom, Holyoke, Hampden County, Massachusetts, USA
06670780017272040075604.jpg
Prehnite

Mount Tom Quarry, Mount Tom, Holyoke, Hampden County, Massachusetts, USA
01372670017272040091693.jpg
Prehnite, etc.

Mount Tom Quarry, Mount Tom, Holyoke, Hampden County, Massachusetts, USA
02638480017362436839148.jpg
Prehnite, etc.

Mount Tom Quarry, Mount Tom, Holyoke, Hampden County, Massachusetts, USA
06463210017362436837487.jpg
Prehnite, etc.

Mount Tom Quarry, Mount Tom, Holyoke, Hampden County, Massachusetts, USA
08880940017362436836074.jpg
Prehnite

Mount Tom Quarry, Mount Tom, Holyoke, Hampden County, Massachusetts, USA
02580040017362436847676.jpg
Prehnite, etc.

Mount Tom Quarry, Mount Tom, Holyoke, Hampden County, Massachusetts, USA
05328390017362436847637.jpg
Prehnite, etc.

Mount Tom Quarry, Mount Tom, Holyoke, Hampden County, Massachusetts, USA
07479380017272040066316.jpg
Prehnite, etc.

Mount Tom Quarry, Mount Tom, Holyoke, Hampden County, Massachusetts, USA
06670780017272040075604.jpg
Prehnite

Mount Tom Quarry, Mount Tom, Holyoke, Hampden County, Massachusetts, USA
06268050017362436845511.jpg
Prehnite, etc.

Mount Tom Quarry, Mount Tom, Holyoke, Hampden County, Massachusetts, USA
Locality type:Quarry
Classification
Species:Prehnite
Formula:Ca2Al2Si3O10(OH)2
Confirmation
Validity:Believed Valid
Associated Minerals Based on Photo Data:
Calcite7
Fluorapophyllite-(K)5
Apophyllite Group3
Datolite2
Babingtonite2
Data
Mineral Data:Click here to view Prehnite data
Locality Data:Click here to view Mount Tom Quarry, Mount Tom, Holyoke, Hampden County, Massachusetts, USA
Photo GalleryView Gallery (5 photos)
Data Identifiers
Mindat Occurrence Record ID:99757
Long-form Identifier:1:3:99757:5
GUID (UUID V4):0
Nearest other occurrences of Prehnite
10.3km (6.4 miles) ⓘNotch Quarry (Lane Quarry; Amherst Quarry; Round Mountain Quarry), Amherst, Hampshire County, Massachusetts, USA
14.2km (8.8 miles) ⓘHampden quarry, West Springfield, Hampden County, Massachusetts, USA
15.5km (9.7 miles) ⓘLane & Son traprock quarries (Lane's Quarry), Westfield, Hampden County, Massachusetts, USA
22.0km (13.7 miles) ⓘPelham Granite quarry (Ward Quarry; Valley Quarry), Pelham, Hampshire County, Massachusetts, USA
29.0km (18.0 miles) ⓘMonson quarries (Flynt quarries), Monson, Hampden County, Massachusetts, USA
34.9km (21.7 miles) ⓘCheapside Quarry (East Deerfield Quarry; Trew Corp. Quarry), Deerfield, Franklin County, Massachusetts, USA
35.2km (21.9 miles) ⓘState Route 20 road cut, East Granby, Hartford County, Connecticut, USA
36.1km (22.5 miles) ⓘRoncari Quarry, East Granby, Hartford County, Connecticut, USA
40.4km (25.1 miles) ⓘTariffville Gorge, Bloomfield, Hartford County, Connecticut, USA
41.6km (25.9 miles) ⓘQuabbin Aqueduct shaft No. 10 locality, Hardwick, Worcester County, Massachusetts, USA
References
Rocks & Min.: 11:124.
 
and/or  
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