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


Locality type:Caldera
Classification
Species:Cristobalite
Formula:SiO2
Confirmation
Validity:Believed Valid
Data
Mineral Data:Click here to view Cristobalite data
Locality Data:Click here to view Newberry Caldera, Newberry National Volcanic Monument, Deschutes County, Oregon, USA
Data Identifiers
Mindat Occurrence Record ID:859680
Long-form Identifier:1:3:859680:2
GUID (UUID V4):0
Nearest other occurrences of Cristobalite
89.4km (55.6 miles) ⓘLemolo Lake, Douglas County, Oregon, USA
89.9km (55.9 miles) ⓘLemolo Lake Quarry, Douglas County, Oregon, USA
97.3km (60.5 miles) ⓘSummit Rock, Klamath County, Oregon, USA
References
Bargar, Keith E. and Keith, Terry E.C. (1986) Hydrothermal Mineralization in GEO N-l Drillhole, Newberry Volcano, Oregon. United States Geological Survey Open-File Report 86-440.
Bargar, Keith E. and Keith, Terry E.C. (1999) Geothermal Drillholes at Newberry Volcano. United States Geological Survey Professional Paper 1578.
 
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