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While externally similar shapes, these two minerals are very different inside.
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Forsterite from
New Cornelia Mine, Ajo, Little Ajo Mountains, Ajo Mining District, Pima County, Arizona, USA


Locality type:Mine
Classification
Species:Forsterite
Formula:Mg2(SiO4)
Comments:Rock forming mineral.
Confirmation
Validity:Believed Valid
Data
Mineral Data:Click here to view Forsterite data
Locality Data:Click here to view New Cornelia Mine, Ajo, Little Ajo Mountains, Ajo Mining District, Pima County, Arizona, USA
Data Identifiers
Mindat Occurrence Record ID:46655
Long-form Identifier:1:3:46655:2
GUID (UUID V4):0
Nearest other occurrences of Forsterite
92.3km (57.3 miles) ⓘLakeshore Mine, North Komelik area, Casa Grande Mining District, Pinal County, Arizona, USA
References
Thomas, William J., Gibbs, Ronald B. (1983) Famous Mineral Localities: The New Cornelia Mine, Ajo, Arizona. The Mineralogical Record, 14 (5) 283-298
 
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