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While externally similar shapes, these two minerals are very different inside.
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Calcite from
Unnamed Occurrence (ARDF - PM036; north of Dorenoi Bay), Aleutians East Borough, Alaska, 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 Unnamed Occurrence (ARDF - PM036; north of Dorenoi Bay), Aleutians East Borough, Alaska, USA
Data Identifiers
Mindat Occurrence Record ID:593813
Long-form Identifier:1:3:593813:1
GUID (UUID V4):0
Nearest other occurrences of Calcite
7.8km (4.8 miles) ⓘPMRGX-21 Prospect (Mud Bay), Aleutians East Borough, Alaska, USA
8.8km (5.4 miles) ⓘUnnamed Occurrence (ARDF - PM028; near Renshaw Point), Aleutians East Borough, Alaska, USA
10.6km (6.6 miles) ⓘUnnamed Prospect (ARDF - PM026; between Balboa Bay and Dorenoi Bay), Aleutians East Borough, Alaska, USA
20.4km (12.7 miles) ⓘUnnamed Occurrence (ARDF - PM032; north of Mine Harbor), Aleutians East Borough, Alaska, USA
44.0km (27.4 miles) ⓘHerman Lode; Trench; Popof Island Gold; Centennial Prospect, Aleutians East Borough, Alaska, USA
45.1km (28.0 miles) ⓘFour Bear; PMRGX-28 Prospect, Aleutians East Borough, Alaska, USA
53.5km (33.2 miles) ⓘUnnamed Occurrence (ARDF - PM012; west of Knutson Lake), Aleutians East Borough, Alaska, USA
53.9km (33.5 miles) ⓘShumagin; Choumagin Prospect, Aleutians East Borough, Alaska, USA
54.3km (33.7 miles) ⓘJunior Prospect, Aleutians East Borough, Alaska, USA
57.1km (35.5 miles) ⓘSitka Mine, Unga Island, Aleutians East Borough, Alaska, USA
References
 
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