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While externally similar shapes, these two minerals are very different inside.
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Siderite from
Twin Buttes Mine, Twin Buttes, Pima Mining District, Sierrita Mountains, Pima County, Arizona, USA


Locality type:Mine
Classification
Species:Siderite
Formula:FeCO3
Confirmation
Validity:Believed Valid
Data
Mineral Data:Click here to view Siderite data
Locality Data:Click here to view Twin Buttes Mine, Twin Buttes, Pima Mining District, Sierrita Mountains, Pima County, Arizona, USA
Data Identifiers
Mindat Occurrence Record ID:716461
Long-form Identifier:1:3:716461:3
GUID (UUID V4):0
Nearest other occurrences of Siderite
22.3km (13.8 miles) ⓘIron Mask Mine (Iron Mask prospect; McCleary prospect; Littleshot prospect), Jackson Mine group (McCleary group; Old Baldy Copper Mine; Rosa Mine; Hickory; Decatur), Jackson Canyon, Old Baldy Mining District, Pima County, Arizona, USA
23.2km (14.4 miles) ⓘJackson Mine group (McCleary group; Old Baldy Copper Mine; Rosa Mine; Hickory; Decatur), Jackson Canyon, Old Baldy Mining District, Pima County, Arizona, USA
27.6km (17.2 miles) ⓘGlove Mine (Sunrise Mine), Glove Mine group (Zombie & Zeco claims; Festiago-Franklin; Blacksmith adit), Cottonwood Canyon, Tyndall Mining District, Santa Cruz County, Arizona, USA
28.5km (17.7 miles) ⓘDakota shaft, Amole Mining District, Tucson Mountains, Pima County, Arizona, USA
30.6km (19.0 miles) ⓘOld Mission Mine, Amole Mining District, Tucson Mountains, Pima County, Arizona, USA
33.9km (21.0 miles) ⓘCerro Colorado Mine (Heintzelman Mine; Silver Queen Mine), Cerro Colorado Mining District, Cerro Colorado Mountains, Pima County, Arizona, USA
34.3km (21.3 miles) ⓘJersey Girl Mine (Jersey Girl prospect), Toluachi group of claims (Toluachi group; Bonanza tunnel; Tennantite claim), Salero area, Tyndall Mining District, Santa Cruz County, Arizona, USA
38.2km (23.7 miles) ⓘForty-nine Mine, Prince Mine group, Hilton Mines, Copper Camp, Hilton (Lead Mountain), Empire Mining District, Empire Mountains, Pima County, Arizona, USA
38.2km (23.8 miles) ⓘChief Mine, Prince Mine group, Hilton Mines, Copper Camp, Hilton (Lead Mountain), Empire Mining District, Empire Mountains, Pima County, Arizona, USA
39.8km (24.7 miles) ⓘHilton Mines, Copper Camp, Hilton (Lead Mountain), Empire Mining District, Empire Mountains, Pima County, Arizona, USA
References
Singer, Donald A., Berger, Vladimir Iosifovich, Moring, Barry C. (2005) Porphyry copper deposits of the world: database, map, and grade and tonnage models. Open-File Report 2005-1060. US Geological Survey doi:10.3133/ofr20051060
 
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