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While externally similar shapes, these two minerals are very different inside.
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Calcite from
Crown King & Tiger Mine groups (Crown King and Tiger Mines), Esperanza Mine group [old], Pima Mining District, Sierrita Mountains, Pima County, Arizona, USA


Classification
Species:Calcite
Formula:CaCO3
Confirmation
Validity:Believed Valid
Data
Mineral Data:Click here to view Calcite data
Locality Data:Click here to view Crown King & Tiger Mine groups (Crown King and Tiger Mines), Esperanza Mine group [old], Pima Mining District, Sierrita Mountains, Pima County, Arizona, USA
Data Identifiers
Mindat Occurrence Record ID:536174
Long-form Identifier:1:3:536174:8
GUID (UUID V4):0
Nearest other occurrences of Calcite
1.5km (1.0 miles) ⓘSierrita Mine, Batamote Hills, Pima Mining District, Sierrita Mountains, Pima County, Arizona, USA
6.7km (4.2 miles) ⓘTwin Buttes Mine, Twin Buttes, Pima Mining District, Sierrita Mountains, Pima County, Arizona, USA
10.8km (6.7 miles) ⓘNeptune Mine, Gunsight Mountain, Papago Mining District (Sierrita Mining District), Sierrita Mountains, Pima County, Arizona, USA
12.2km (7.6 miles) ⓘSan Xavier Mine (San Xavier Mine shaft), Pima Mining District, Sierrita Mountains, Pima County, Arizona, USA
13.9km (8.6 miles) ⓘMineral Hill Mines (Azurite group; Old Azurite Mine; Copper Glance Mine), Mineral Hill, Mission complex, San Xavier, Pima Mining District, Sierrita Mountains, Pima County, Arizona, USA
14.9km (9.3 miles) ⓘMission pit, Mission complex, San Xavier, Pima Mining District, Sierrita Mountains, Pima County, Arizona, USA
15.8km (9.8 miles) ⓘMission complex, San Xavier, Pima Mining District, Sierrita Mountains, Pima County, Arizona, USA
18.4km (11.4 miles) ⓘSan Xavier pit (San Xavier open pit; San Xavier West Mine; San Xavier Unit Open pit), Mission complex, San Xavier, Pima Mining District, Sierrita Mountains, Pima County, Arizona, USA
18.5km (11.5 miles) ⓘBlack Dike Mine (Black Dike group; Black Dike claim; Black Dike deposit; Black Dyke Mine; Big Dike; Bobson group; Big Dike Apex & Ajax), Papago Mining District (Sierrita Mining District), Sierrita Mountains, Pima County, Arizona, USA
27.1km (16.8 miles) ⓘTreasure Vault Mine, Agua Caliente Canyon, Tyndall Mining District, Santa Cruz County, Arizona, USA
References
MRDS database Dep. ID file #10026759, MRDS ID #M000103.
 
and/or  
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