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
Bull Run Quarry, Conklin, Loudoun County, Virginia, USA


04026690017272017381978.jpg
Prehnite, etc.

Bull Run Quarry, Conklin, Loudoun County, Virginia, USA
04737010017271980172160.jpg
Prehnite, etc.

Bull Run Quarry, Conklin, Loudoun County, Virginia, USA
06251940017271980204527.jpg
Prehnite, etc.

Bull Run Quarry, Conklin, Loudoun County, Virginia, USA
08463080017271980234366.jpg
Prehnite, etc.

Bull Run Quarry, Conklin, Loudoun County, Virginia, USA
03451580017362358405640.jpg
Prehnite, etc.

Bull Run Quarry, Conklin, Loudoun County, Virginia, USA
04589220017362358406460.jpg
Prehnite, etc.

Bull Run Quarry, Conklin, Loudoun County, Virginia, USA
06816540017362358409034.jpg
Prehnite, etc.

Bull Run Quarry, Conklin, Loudoun County, Virginia, USA
09753230017362358408065.jpg
Prehnite, etc.

Bull Run Quarry, Conklin, Loudoun County, Virginia, USA
04026690017272017381978.jpg
Prehnite, etc.

Bull Run Quarry, Conklin, Loudoun County, Virginia, USA
04737010017271980172160.jpg
Prehnite, etc.

Bull Run Quarry, Conklin, Loudoun County, Virginia, USA
06251940017271980204527.jpg
Prehnite, etc.

Bull Run Quarry, Conklin, Loudoun County, Virginia, USA
08463080017271980234366.jpg
Prehnite, etc.

Bull Run Quarry, Conklin, Loudoun County, Virginia, USA
Locality type:Quarry
Classification
Species:Prehnite
Formula:Ca2Al2Si3O10(OH)2
Confirmation
Validity:Believed Valid
Associated Minerals Based on Photo Data:
Hydroxyapophyllite-(K)9
Quartz9
- var Smoky Quartz1
Laumontite6
Pumpellyite Subgroup6
Calcite4
Apophyllite Group4
Stilbite Subgroup3
Fluorapophyllite-(K)3
Clinochlore3
Amphibole Supergroup3
- var Byssolite3
Chalcopyrite1
Galena1
Babingtonite1
Pectolite1
Actinolite1
Data
Mineral Data:Click here to view Prehnite data
Locality Data:Click here to view Bull Run Quarry, Conklin, Loudoun County, Virginia, USA
Photo GalleryView Gallery (17 photos)
Data Identifiers
Mindat Occurrence Record ID:50745
Long-form Identifier:1:3:50745:1
GUID (UUID V4):0
Nearest other occurrences of Prehnite
5.7km (3.5 miles) ⓘFairfax Quarry, Centreville, Culpeper Basin, Fairfax County, Virginia, USA
8.0km (5.0 miles) ⓘVirginia Crushed Stone Quarry, Loudoun County, Virginia, USA
8.3km (5.1 miles) ⓘChantilly Quarry, Chantilly, Loudoun County, Virginia, USA
9.7km (6.0 miles) ⓘManassas Quarry, Fairfax County, Virginia, USA
9.8km (6.1 miles) ⓘCentreville, Culpeper Basin, Fairfax County, Virginia, USA
10.1km (6.3 miles) ⓘGainesville Quarry, Gainesville, Prince William County, Virginia, USA
10.3km (6.4 miles) ⓘVulcan Materials Company Crushed Stone Quarry (Manassas Quarry), Manassas, Prince William County, Virginia, USA
14.9km (9.3 miles) ⓘMillbrook Quarry (Haymarket Quarry), Haymarket, Prince William County, Virginia, USA
23.2km (14.4 miles) ⓘNew Goose Creek Quarry, Leesburg, Loudoun County, Virginia, USA
26.8km (16.6 miles) ⓘQuarry (MRDS - 10184216), Warrenton, Fauquier County, Virginia, USA
References
Rocks & Min.:60:167.
Dave Lines (2008) Manassas-147 Years After the Battle of Bull Run. Southern Maryland Rock and Mineral Club Rock Talk. May p7
 
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