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While externally similar shapes, these two minerals are very different inside.
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Smectite Group from
Cougar Mine, San Miguel County, Colorado, USA


Locality type:Mine
Classification
Species:'Smectite Group' (not an IMA approved species)
Formula:A0.3D2-3[T4O10]Z2 · nH2O
Confirmation
Validity:Believed Valid
Data
Mineral Data:Click here to view Smectite Group data
Locality Data:Click here to view Cougar Mine, San Miguel County, Colorado, USA
Data Identifiers
Mindat Occurrence Record ID:795191
Long-form Identifier:1:3:795191:6
GUID (UUID V4):0
Nearest other occurrences of Smectite Group
75.4km (46.9 miles) ⓘBlack King Mine (Black King No. 4; Black King No. 5; Black King No. 5 Claim; Unpatented Claims: Black King No. 1; Evans Claims; Weatherly Claims), Placerville Mining District, Lower San Miguel Mining District, San Miguel County, Colorado, USA
76.8km (47.7 miles) ⓘPlacerville Mining District, Lower San Miguel Mining District, San Miguel County, Colorado, USA
84.1km (52.3 miles) ⓘCarpenter Mine, Lower San Miguel Mining District, San Miguel County, Colorado, USA
References
Shawe, D.R., (2011), Uranium-vanadium deposits of the Slick Rock district, Colorado: U.S. Geological Survey Professional Paper 576-F, 80 p., 20 plates.
 
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