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While externally similar shapes, these two minerals are very different inside.
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Marcasite from
Pinos Altos Mine, Pinos Altos Mining District, Grant County, New Mexico, USA


Locality type:Mine
Classification
Species:Marcasite
Formula:FeS2
Confirmation
Validity:Believed Valid
Data
Mineral Data:Click here to view Marcasite data
Locality Data:Click here to view Pinos Altos Mine, Pinos Altos Mining District, Grant County, New Mexico, USA
Data Identifiers
Mindat Occurrence Record ID:1454828
Long-form Identifier:1:3:1454828:8
GUID (UUID V4):0
Nearest other occurrences of Marcasite
19.2km (11.9 miles) ⓘChino Mine (Santa Rita pit; Santa Rita Mine), Santa Rita, Santa Rita Mining District, Grant County, New Mexico, USA
30.3km (18.8 miles) ⓘBlack Hawk Mine, Twin Peaks, Black Hawk Mining District, Big Burro Mountains, Grant County, New Mexico, USA
References
(2005) Mineral Resources Data System (MRDS), US Geological Survey.
 
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