Marcasite from


USA
Colorado Chaffee County Sedalia Mining District ⓘ Sedalia Mine (Sedalia Copper Mine)	The Canadian Mineralogist Vol. 43, pp. 601-622 (2005) U.S. Geological Survey Professional Paper 829
Custer County ⓘ Marion Mine	The Canadian Mineralogist Vol. 43, pp. 601-622 (2005)
Fremont County Cotopaxi Mining District Cotopaxi Mine Gulch ⓘ Cotopaxi Mine (Cotopaxi lode; Gumaer Mine; Fannie lode; Fannie Mill)	Spry, P. G., McFadden, S., Teale, G. S., Alers, B., Shallow, J. M., & Glenn, J. M. (2021). Nodular sillimanite rocks as field indicators to metamorphosed massive sulfide deposits. Ore Geology Reviews, 104632. The Canadian Mineralogist Vol. 43, pp. 601-622 (2005) Eckel, Edwin Butt , Cobban, Robert R., Mosburg, Shirley K., Foord, Eugene E. (1997) Minerals of Colorado. Fulcrum Publishing. Am Min 50:1179-1212
ⓘ Gem Park complex	Armbrustmacher, T. J. (1988) Geology and resources of thorium and associated elements in the Wet Mountains area, Fremont and Custer counties, Colorado. USGS Professional Paper: 1049-F
Penrose ⓘ Portland Limestone quarry	Eckel, Edwin Butt , Cobban, Robert R., Mosburg, Shirley K., Foord, Eugene E. (1997) Minerals of Colorado. Fulcrum Publishing. Steve Stuart (information obtained from local collector)
Tallahassee Creek Mining District ⓘ Glen Williams Mine (Williams Mine)	Eckel, Edwin Butt , Cobban, Robert R., Mosburg, Shirley K., Foord, Eugene E. (1997) Minerals of Colorado. Fulcrum Publishing.
Rio Grande County ⓘ Summitville Mining District (Summit Mining District)	Eckel, Edwin Butt , Cobban, Robert R., Mosburg, Shirley K., Foord, Eugene E. (1997) Minerals of Colorado. Fulcrum Publishing.
Saguache County ⓘ Lookout No. 22 claim	(2005) Mineral Resources Data System (MRDS), US Geological Survey. Am Min 50:909-923
ⓘ Pitch Mine	(2005) Mineral Resources Data System (MRDS), US Geological Survey. USGS Bull 1797
Teller County Cripple Creek Mining District ⓘ Ajax Mine	Carnein, Carl R., Bartos, Paul J. (2005) Famous mineral localities: The Cripple Creek Mining District, Colorado, in March - April 2005. The Mineralogical Record, 36 (2) 143-185 Econ Geol (1985) 80:1669-1688
Cripple Creek ⓘ Independence Mine (Stratton Independence Mine) ?	Carnein, Carl R., Bartos, Paul J. (2005) Famous mineral localities: The Cripple Creek Mining District, Colorado, in March - April 2005. The Mineralogical Record, 36 (2) 143-185
Eclipse Gulch ⓘ Cripple Creek & Victor Gold Mine (Cresson Mine)	Carnein, Carl R., Bartos, Paul J. (2005) Famous mineral localities: The Cripple Creek Mining District, Colorado, in March - April 2005. The Mineralogical Record, 36 (2) 143-185

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