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While externally similar shapes, these two minerals are very different inside.
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Feldspar Group from
East Helvetia deposit (Helvetia East Mine; Helvetia Mine; Rosemont deposit), Rosemont (Rosemont Camp), Helvetia-Rosemont Mining District, Pima County, Arizona, USA


Locality type:Deposit
Classification
Species:'Feldspar Group' (not an IMA approved species)
Confirmation
Validity:Believed Valid
Data
Mineral Data:Click here to view Feldspar Group data
Locality Data:Click here to view East Helvetia deposit (Helvetia East Mine; Helvetia Mine; Rosemont deposit), Rosemont (Rosemont Camp), Helvetia-Rosemont Mining District, Pima County, Arizona, USA
Data Identifiers
Mindat Occurrence Record ID:544037
Long-form Identifier:1:3:544037:5
GUID (UUID V4):0
Nearest other occurrences of Feldspar Group
35.9km (22.3 miles) ⓘAztec Mine (Aztec group of claims; Aztec Mine group; Andes group), Aztec Gulch, Alum Gulch, Harshaw Mining District, Patagonia Mountains, Santa Cruz County, Arizona, USA
42.5km (26.4 miles) ⓘSalvador Mine (Salvadore Mine; San Salvador Mine), Hermosa group, Hardshell Gulch, Harshaw, Harshaw Mining District, Patagonia Mountains, Santa Cruz County, Arizona, USA
50.3km (31.3 miles) ⓘUnnamed copper mine, Deer Creek, Pima County, Arizona, USA
62.9km (39.1 miles) ⓘMontezuma Mine, Tombstone Mining District, Cochise County, Arizona, USA
64.1km (39.8 miles) ⓘTungsten King Mine, Black Rock group, Cochise Mining District, Cochise County, Arizona, USA
64.2km (39.9 miles) ⓘAmerican Mine (American shaft; War Eagle Mine; La Vantia Mine; La Ventia Mine), Yellowstone Mining District, Cochise County, Arizona, USA
68.5km (42.5 miles) ⓘBluebird Mine, Primos group of claims (Primos Mine), Dragoon, Cochise Mining District, Cochise County, Arizona, USA
71.4km (44.4 miles) ⓘCenturion Mine, Centurion, Cochise Mining District, Cochise County, Arizona, USA
71.8km (44.6 miles) ⓘMoore Mine, Johnson Camp, Gunnison Copper Project, Cochise Mining District, Cochise County, Arizona, USA
76.9km (47.8 miles) ⓘFesterling Mine (Elsicor Mine; Cora Mine), Black Diamond Peak, Middle Pass Mining District, Cochise County, Arizona, USA
References
 
and/or  
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