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

This page kindly sponsored by Peter Megaw
Latitude & Longitude (WGS84): 28° 36' North , 105° 52' West
Latitude & Longitude (decimal): 28.60000,-105.86667
Köppen climate type:BSh : Hot semi-arid (steppe) climate
Name(s) in local language(s):Mina El Potosí, Francisco Portillo, Campo Oeste, Distrito de Santa Eulalia, Municipio de Aquiles Serdán, Chihuahua, México

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

51 valid minerals.

Regional Geology

This geological map and associated information on rock units at or nearby to the coordinates given for this locality is based on relatively small scale geological maps provided by various national Geological Surveys. This does not necessarily represent the complete geology at this locality but it gives a background for the region in which it is found.

Click on geological units on the map for more information. Click here to view full-screen map on

2.588 - 23.03 Ma

ID: 2431880

Age: Neogene (2.588 - 23.03 Ma)

Lithology: Acidic igneous extrusive

Reference: Instituto Nacional de Estadística, Geografía e Informática. Conjunto de Datos Vectoriales Geológicos. Continuo Nacional. Escala 1:1’000,000. [63]

Data and map coding provided by, used under Creative Commons Attribution 4.0 License

This page contains all mineral locality references listed on This does not claim to be a complete list. If you know of more minerals from this site, please register so you can add to our database. This locality information is for reference purposes only. You should never attempt to visit any sites listed in without first ensuring that you have the permission of the land and/or mineral rights holders for access and that you are aware of all safety precautions necessary.


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.

Megaw, 1990

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