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


08695630017367254473928.jpg
Magnetite, etc.

Hunting Hill Quarry, Rockville, Montgomery County, Maryland, USA
06784990017771429777054.jpg
Magnetite, etc.

Hunting Hill Quarry, Rockville, Montgomery County, Maryland, USA
02788410017771429781826.jpg
Magnetite, etc.

Hunting Hill Quarry, Rockville, Montgomery County, Maryland, USA
06784990017771429777054.jpg
Magnetite, etc.

Hunting Hill Quarry, Rockville, Montgomery County, Maryland, USA
07943150017367254497527.jpg
Magnetite, etc.

Hunting Hill Quarry, Rockville, Montgomery County, Maryland, USA
06784990017771429777054.jpg
Magnetite, etc.

Hunting Hill Quarry, Rockville, Montgomery County, Maryland, USA
Locality type:Quarry
Classification
Species:Magnetite
Formula:Fe2+Fe23+O4
Confirmation
Validity:Believed Valid
Associated Minerals Based on Photo Data:
Serpentine Subgroup15
Xonotlite11
Dolomite5
Magnesite3
Pokrovskite3
Talc2
Coalingite2
Calcite2
Antigorite2
Rodingite1
Diopside1
- var Chromium-bearing Diopside1
Limonite1
Grossular1
Chromite-Magnesiochromite Series1
Data
Mineral Data:Click here to view Magnetite data
Locality Data:Click here to view Hunting Hill Quarry, Rockville, Montgomery County, Maryland, USA
Photo GalleryView Gallery (2 photos)
Data Identifiers
Mindat Occurrence Record ID:46608
Long-form Identifier:1:3:46608:4
GUID (UUID V4):0
Nearest other occurrences of Magnetite
4.3km (2.7 miles) ⓘUnnamed Talc Prospect, Seneca, Montgomery County, Maryland, USA
5.4km (3.3 miles) ⓘTschiffely (Wheatlands) Aggregate Quarry, Montgomery County, Maryland, USA
7.2km (4.5 miles) ⓘFord Mine, Potomac, Montgomery County, Maryland, USA
9.2km (5.7 miles) ⓘMaryland Mine (Allen shaft), Potomac, Montgomery County, Maryland, USA
11.4km (7.1 miles) ⓘDifficult Run, Fairfax County, Virginia, USA
11.5km (7.2 miles) ⓘCabin John Creek, Montgomery County, Maryland, USA
13.6km (8.5 miles) ⓘJenkins Farm Prospect, Fairfax County, Virginia, USA
20.7km (12.8 miles) ⓘSoapstone Valley, NW Washington, District of Columbia (Washington D.C.), USA
22.4km (13.9 miles) ⓘEdnor Steatite Locality, Ednor, Montgomery County, Maryland, USA
25.0km (15.6 miles) ⓘOld Goose Creek Quarry, Leesburg, Loudoun County, Virginia, 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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