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While externally similar shapes, these two minerals are very different inside.
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Heulandite Subgroup from
Newberry Caldera, Newberry National Volcanic Monument, Deschutes County, Oregon, USA


Locality type:Caldera
Classification
Species:'Heulandite Subgroup' (not an IMA approved species)
Formula:(Na/Ca/K)5-6[Al8-9 Si27-28 O72] · nH2O
Confirmation
Validity:Believed Valid
Data
Mineral Data:Click here to view Heulandite Subgroup data
Locality Data:Click here to view Newberry Caldera, Newberry National Volcanic Monument, Deschutes County, Oregon, USA
Data Identifiers
Mindat Occurrence Record ID:859644
Long-form Identifier:1:3:859644:4
GUID (UUID V4):0
Nearest other occurrences of Heulandite Subgroup
83.5km (51.9 miles) ⓘWildcat Creek, Ochoco Mountains, Crook County, Oregon, USA
98.2km (61.0 miles) ⓘ4165T Quarry, Staley Ridge, Calapooya Mountains, Douglas County, Oregon, USA
References
Mineralogy of 10 Geothermal boreholes drilled in and around the Newberry Caldera U.S. Geological Survey Professional Paper, Issue 1578 By Keith E. Bargar, Terry E. C. Keith 1999
 
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