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


Locality type:Mine
Classification
Species:Goethite
Formula:Fe3+O(OH)
Comments:Occurs as fine, earthy powders; a constituent of a yellow-brown to deep brown limonitic crust on the rusty outcrops of the oxidized part of the orebody.
Confirmation
Validity:Believed Valid
Associated Minerals Based on Photo Data:
Malachite2
Azurite1
Quartz1
Ajoite1
Data
Mineral Data:Click here to view Goethite 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:46708
Long-form Identifier:1:3:46708:3
GUID (UUID V4):0
Nearest other occurrences of Goethite
74.7km (46.4 miles) ⓘWeldon Mine, Ben Nevis Mountain, Quijotoa Mining District, Quijotoa Mountains, Pima County, Arizona, USA
92.3km (57.3 miles) ⓘLakeshore Mine, North Komelik area, Casa Grande Mining District, Pinal County, Arizona, USA
94.8km (58.9 miles) ⓘMildren Mine (Mildren claim; Mildred Mine), Mildren Mine group, Ko Vaya, Cababi Mining District (Comobabi Mining District), Comobabi Mountains, Pima County, Arizona, USA
97.2km (60.4 miles) ⓘSteppe Mine (Steppe claim; Little Mary Mine), Mildren Mine group, Ko Vaya, Cababi Mining District (Comobabi Mining District), Comobabi Mountains, Pima County, Arizona, USA
References
Gilluly, J. (1937), AZ Bur. Mines Bull. 141: 68-75, 79-81
Gilluly, J. (1946), The Ajo mining district, Arizona, USGS PP 209: 91.
Thomas, William J., Gibbs, Ronald B. (1983) Famous Mineral Localities: The New Cornelia Mine, Ajo, Arizona. The Mineralogical Record, 14 (5) 283-298
Anthony, John W.; Williams, Sidney A.; Bideaux, Richard A.; Grant, Raymond W. (1995) Mineralogy of Arizona (3rd ed.). University of Arizona Press.p.233
 
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