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El Filo vein, Santa Librada, Mun. de Mapimí, Durango, Mexicoi
Regional Level Types
El Filo veinVein
Santa Librada- not defined -
Mun. de MapimíMunicipality
Durango- not defined -

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Location is approximate, estimate based on other nearby localities.
Latitude & Longitude (WGS84): 25° North , 103° West (est.)
Margin of Error:~3km
Locality type:Vein
Köppen climate type:BWh : Hot deserts climate

One of a cluster of small mines at Santa Librada, Municipio of Mapimi, Durango. The El Filo and Santa Gertrudis Veins are the best known, with Santa Gertrudis only emerging on the specimen scene in 2011. Both veins are very similar, dominantly filled by very fine-grained massive silica, which was brecciated and resilicified during and after fluorite growth. El Filo fluorites range from 1 to 20 cm across and vary from almost colorless (or gray) to lavender to dark purple. Santa Gertrudis specimens are similar but with a maximum crystal size to date of 3 cm. Crystals are cubic, often with very well developed growth spirals on the cube faces. These distinctive faces occasionally show color zoning with the darkest purple occurring along the edges of growth spirals. Interpenetration twins are known but uncommon. El Filo and Santa Gertrudis are not big producers, and because they lie within the Mapimi Municipality, specimens are often mislabeled as coming from the Ojuela mine. Their color often gets them mistaken for Muzquiz material as well, although the siliceous matrix and lack of petroleum odor are definitive.

Regions containing this locality

North America PlateTectonic Plate

Select Mineral List Type

Standard Detailed Strunz Dana Chemical Elements

Mineral List

3 valid minerals.

Detailed Mineral List:

Formula: CaCO3
Reference: Rob Lavinsky photo
Formula: CaF2
Reference: Fluorite: The Collector's Choice. Extra Lapis English No. 9
Formula: SiO2
Reference: Rob Lavinsky photo

List of minerals arranged by Strunz 10th Edition classification

Group 3 - Halides
Group 4 - Oxides and Hydroxides
Group 5 - Nitrates and Carbonates

List of minerals arranged by Dana 8th Edition classification

Group 75 - TECTOSILICATES Si Tetrahedral Frameworks
Si Tetrahedral Frameworks - SiO2 with [4] coordinated Si

List of minerals for each chemical element

C CalciteCaCO3
O CalciteCaCO3
O QuartzSiO2
F FluoriteCaF2
Si QuartzSiO2
Ca FluoriteCaF2
Ca CalciteCaCO3


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Megaw, 2013, Mexican Fluorite, Rocks and Minerals.

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