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Potosí Mine (El Potosí Mine), Francisco Portillo, West Camp, Santa Eulalia District, Mun. de Aquiles Serdán, Chihuahua, Mexico

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Latitude & Longitude (WGS84): 28° 36' North , 105° 52' West
Latitude & Longitude (decimal): 28.6, -105.866666667
Name(s) in local language(s): Mina El Potosí, Francisco Portillo, Campo Oeste, Distrito de Santa Eulalia, Municipio de Aquiles Serdán, Chihuahua, México
 
Ref.: Panczner (1987): 94, 98, 101, 118, 128, 141, 165, 169, 172, 191, 195, 200, 226, 227, 231, 234-236, 239, 248, 263, 274, 275, 281, 297, 310, 316, 319, 321, 328, 330, 339, 348, 350, 366.

All of the rhodochrosite from the West Camp of the Santa Eulalia District comes from the Potosi Mine (Mina El Potosi) and except for some palid material from the A-10 or Inglaterra Orebody (NOT Condesa) all of the good rhodochrosite from the district comes from the Main Silicate Orebody which extends from between the 8th and 9th Levels down to the 11th Level of the Mine. Principal access to the orebody was on the 10th Level.

The Main Silicate Orebody is an unusal calcic-iron skarn body composed of a prograde assemblage of finely banded manganoan hedenbergite and manganoan fayalite that on retrograde alteration (hydration) was altered to chlorite (clinochlore and cronstedtite), quartz, ilvaite and rhodochrosite. The retrograde event generated abundant voids into which rhodochrosite, fluorite, hubnerite, quartz and abundant rare species grew.

The rhodochrosite from this orebody shows a bewildering range of habits from pale pink botryoidal crusts (often on glassy hisingerite which gets misidentified as a wide range of species...including coal!) through simple rhombohedra to complex elongate scalenohedra with rhobohedral terminations. Typically the more elongate habits are gemmier.

There are a number of other calcic-iron skarn bodies in the West Camp, but only the A-10/Inglaterra Orebody has any decently crystallized rhodochrosite

Mineral List



50 entries listed. 50 valid minerals.

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References

Megaw, 1990

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