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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Chalcedony from
Weir Mine, Holbrook, Baltimore County, Maryland, USA


06007260017362544963268.jpg
Chalcedony

Weir Mine, Holbrook, Baltimore County, Maryland, USA
06007260017362544963268.jpg
Chalcedony

Weir Mine, Holbrook, Baltimore County, Maryland, USA
04475320017272035652065.jpg
Chalcedony

Weir Mine, Holbrook, Baltimore County, Maryland, USA
Locality type:Mine
Classification
Species:Quartz var: Chalcedony
Formula:SiO2
Confirmation
Validity:Believed Valid
Data
Mineral Data:Click here to view Chalcedony data
Locality Data:Click here to view Weir Mine, Holbrook, Baltimore County, Maryland, USA
Data Identifiers
Mindat Occurrence Record ID:747164
Long-form Identifier:1:3:747164:3
GUID (UUID V4):0
Nearest other occurrences of Chalcedony
0.5km (0.3 miles) ⓘHarris Mine, Holbrook, Baltimore County, Maryland, USA
1.0km (0.6 miles) ⓘUnnamed Ore Bank, Owings Mills, Baltimore County, Maryland, USA
1.0km (0.6 miles) ⓘUnnamed Chalcedony occurrence [1], Holbrook, Baltimore County, Maryland, USA
1.6km (1.0 miles) ⓘChoate Mine, Owings Mills, Baltimore County, Maryland, USA
3.1km (1.9 miles) ⓘDelight Quarry (Soldier's Delight Quarry; Dyer Quarry), Soldiers' Delight ridge, Delight, Baltimore County, Maryland, USA
4.7km (2.9 miles) ⓘDelight, Baltimore County, Maryland, USA
12.7km (7.9 miles) ⓘLord Baltimore Drive Quartz occurrence area, Windsor Mill, Baltimore County, Maryland, USA
12.9km (8.0 miles) ⓘPatapsco Glen Construction Site, Woodlawn, Baltimore County, Maryland, USA
16.7km (10.4 miles) ⓘUnnamed Chromite prospects, Bare Hills, Baltimore County, Maryland, USA
16.9km (10.5 miles) ⓘBare Hills Serpentine Quarry East, Bare Hills, Baltimore County, Maryland, USA
References
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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