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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Marcasite from
Nancy Wood mine (Sugar Loaf; Forest; Pittsburg; Gray Copper), Gold Hill, Gold Hill Mining District, Boulder County, Colorado, USA


Locality type:Mine
Classification
Species:Marcasite
Formula:FeS2
Confirmation
Validity:Believed Valid
Data
Mineral Data:Click here to view Marcasite data
Locality Data:Click here to view Nancy Wood mine (Sugar Loaf; Forest; Pittsburg; Gray Copper), Gold Hill, Gold Hill Mining District, Boulder County, Colorado, USA
Data Identifiers
Mindat Occurrence Record ID:271996
Long-form Identifier:1:3:271996:2
GUID (UUID V4):0
Nearest other occurrences of Marcasite
0.6km (0.4 miles) ⓘWood Mountain Group, Gold Hill Mining District, Boulder County, Colorado, USA
1.3km (0.8 miles) ⓘLogan & Sunbeam Occurrence, Gold Hill Mining District, Boulder County, Colorado, USA
1.3km (0.8 miles) ⓘGrand Republic Occurrence, Gold Hill Mining District, Boulder County, Colorado, USA
4.1km (2.5 miles) ⓘArcher, Gold Hill Mining District, Boulder County, Colorado, USA
4.1km (2.6 miles) ⓘInterocean Mine, Gold Hill Mining District, Boulder County, Colorado, USA
4.1km (2.6 miles) ⓘRichard occurrence (Minnie Bell; Washburn; White Eagle; Dolly; Plough Boy; Oceola; Gillaspie), Gold Hill Mining District, Boulder County, Colorado, USA
4.6km (2.9 miles) ⓘOsceola, Gold Hill Mining District, Boulder County, Colorado, USA
12.6km (7.8 miles) ⓘBettig mine, Boulder County Tungsten Mining District, Boulder County, Colorado, USA
12.8km (8.0 miles) ⓘAnna C. Mine (Vacant Spot; Minnie Foy; Lone Pine; Beddig; Oregon; Niagara; Denver; Illinois; Greyback; Sunset Sisson; Spiderleg; Conger; Quay), Boulder County Tungsten Mining District, Boulder County, Colorado, USA
22.5km (14.0 miles) ⓘMena Mine (Hoffmeister Homestead Prospect; Black Judge Shaft), Ralston Buttes Mining District, Jefferson County, Colorado, USA
References
Eckel, Edwin Butt; Cobban, Robert R.; Mosburg, Shirley K.; Foord, Eugene E. (1997) Minerals of Colorado. Fulcrum Publishing.
 
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