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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Opal from
Delight Quarry (Soldier's Delight Quarry; Dyer Quarry), Soldiers' Delight ridge, Delight, Baltimore County, Maryland, USA


03799910017368415529827.jpg
Opal, etc.

Delight Quarry, Soldiers' Delight ridge, Delight, Baltimore County, Maryland, USA
03799910017368415529827.jpg
Opal, etc.

Delight Quarry, Soldiers' Delight ridge, Delight, Baltimore County, Maryland, USA
03022400017272035421377.jpg
Opal, etc.

Delight Quarry, Soldiers' Delight ridge, Delight, Baltimore County, Maryland, USA
Locality type:Quarry
Classification
Species:Opal
Formula:SiO2 · nH2O
Comments:Occurs in serpentine rock.
Confirmation
Validity:Believed Valid
Associated Minerals Based on Photo Data:
Deweylite3
Antigorite2
Data
Mineral Data:Click here to view Opal data
Locality Data:Click here to view Delight Quarry (Soldier's Delight Quarry; Dyer Quarry), Soldiers' Delight ridge, Delight, Baltimore County, Maryland, USA
Data Identifiers
Mindat Occurrence Record ID:63557
Long-form Identifier:1:3:63557:8
GUID (UUID V4):0
Nearest other occurrences of Opal
13.7km (8.5 miles) ⓘLord Baltimore Drive Quartz occurrence area, Windsor Mill, Baltimore County, Maryland, USA
14.5km (9.0 miles) ⓘPatapsco Glen Construction Site, Woodlawn, Baltimore County, Maryland, USA
15.6km (9.7 miles) ⓘUnnamed Chromite prospects, Bare Hills, Baltimore County, Maryland, USA
15.7km (9.8 miles) ⓘBare Hills Serpentine Quarry East, Bare Hills, Baltimore County, Maryland, USA
27.7km (17.2 miles) ⓘGarey Ore Bank, Anne Arundel County, Maryland, USA
44.9km (27.9 miles) ⓘPaint Branch, White Oak, Montgomery County, Maryland, USA
45.2km (28.1 miles) ⓘWhite Oak, Montgomery County, Maryland, USA
51.9km (32.2 miles) ⓘTeeter Quarry, Cumberland Township, Adams County, Pennsylvania, USA
52.3km (32.5 miles) ⓘMaryland Green Marble Corporation Quarry (Cardiff Serpentine Quarry), Cardiff, Harford County, Maryland, USA
52.7km (32.7 miles) ⓘHunting Hill Quarry, Rockville, Montgomery County, Maryland, USA
References
Rocks & Min.:11:111
19:148.
 
and/or  
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