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While externally similar shapes, these two minerals are very different inside.
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Tridymite from
Kramer Borate deposit, Boron, Kern County, California, USA


Locality type:Deposit
Classification
Species:Tridymite
Formula:SiO2
Confirmation
Validity:Believed Valid
Data
Mineral Data:Click here to view Tridymite data
Locality Data:Click here to view Kramer Borate deposit, Boron, Kern County, California, USA
Data Identifiers
Mindat Occurrence Record ID:510026
Long-form Identifier:1:3:510026:2
GUID (UUID V4):0
Nearest other occurrences of Tridymite
6.1km (3.8 miles) ⓘSaddleback Mountain, East Kramer Borate area (East Kramer Colemanite area), East Kramer Mining District, San Bernardino County, California, USA
65.0km (40.4 miles) ⓘUnnamed Agate-Quartz occurrence [2], Robbers Mountain, San Bernardino County, California, USA
References
Cal Div of Mines & Geology "Mineral Information Service" V. 22 N. 10 Oct 1969
 
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