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
Hunting Hill Quarry, Rockville, Montgomery County, Maryland, USA


09154880017361190776186.jpg
Prehnite

Hunting Hill Quarry, Rockville, Montgomery County, Maryland, USA
00242670017272022485369.jpg
Prehnite

Hunting Hill Quarry, Rockville, Montgomery County, Maryland, USA
01480270017272022499542.jpg
Prehnite

Hunting Hill Quarry, Rockville, Montgomery County, Maryland, USA
08766510017272022502566.jpg
Prehnite, etc.

Hunting Hill Quarry, Rockville, Montgomery County, Maryland, USA
09154880017361190776186.jpg
Prehnite

Hunting Hill Quarry, Rockville, Montgomery County, Maryland, USA
01526340017362344051028.jpg
Prehnite

Hunting Hill Quarry, Rockville, Montgomery County, Maryland, USA
06433130017362344056092.jpg
Prehnite

Hunting Hill Quarry, Rockville, Montgomery County, Maryland, USA
02080790017362344067670.jpg
Prehnite, etc.

Hunting Hill Quarry, Rockville, Montgomery County, Maryland, USA
09154880017361190776186.jpg
Prehnite

Hunting Hill Quarry, Rockville, Montgomery County, Maryland, USA
00242670017272022485369.jpg
Prehnite

Hunting Hill Quarry, Rockville, Montgomery County, Maryland, USA
01480270017272022499542.jpg
Prehnite

Hunting Hill Quarry, Rockville, Montgomery County, Maryland, USA
07058260017362344066627.jpg
Prehnite, etc.

Hunting Hill Quarry, Rockville, Montgomery County, Maryland, USA
Locality type:Quarry
Classification
Species:Prehnite
Formula:Ca2Al2Si3O10(OH)2
Confirmation
Validity:Believed Valid
Associated Minerals Based on Photo Data:
Stellerite4
Calcite4
Dolomite2
Laumontite1
Data
Mineral Data:Click here to view Prehnite data
Locality Data:Click here to view Hunting Hill Quarry, Rockville, Montgomery County, Maryland, USA
Photo GalleryView Gallery (8 photos)
Data Identifiers
Mindat Occurrence Record ID:46613
Long-form Identifier:1:3:46613:6
GUID (UUID V4):0
Nearest other occurrences of Prehnite
23.7km (14.7 miles) ⓘDickerson Trap Rock Quarries, Dickerson, Montgomery County, Maryland, USA
25.0km (15.6 miles) ⓘNew Goose Creek Quarry, Leesburg, Loudoun County, Virginia, USA
28.8km (17.9 miles) ⓘChantilly Quarry, Chantilly, Loudoun County, Virginia, USA
29.0km (18.0 miles) ⓘVirginia Crushed Stone Quarry, Loudoun County, Virginia, USA
31.8km (19.7 miles) ⓘCentreville, Culpeper Basin, Fairfax County, Virginia, USA
32.1km (19.9 miles) ⓘManassas Quarry, Fairfax County, Virginia, USA
36.3km (22.5 miles) ⓘFairfax Quarry, Centreville, Culpeper Basin, Fairfax County, Virginia, USA
36.3km (22.6 miles) ⓘBull Run Quarry, Conklin, Loudoun County, Virginia, USA
43.1km (26.8 miles) ⓘVulcan Materials Company Crushed Stone Quarry (Manassas Quarry), Manassas, Prince William County, Virginia, USA
46.1km (28.6 miles) ⓘGainesville Quarry, Gainesville, Prince William County, Virginia, USA
References
Rocks & Minerals: 61: 347.
Bernstein, Lawrence R. (1980) Minerals of the Washington, D.C. Area - Issue 5 of Educational series, Maryland Geological Survey. Department of Natural Resources, Maryland Geological Survey. p.1-148.
 
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