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
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
51 entries listed. 51 valid minerals.
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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.