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While externally similar shapes, these two minerals are very different inside.
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Prehnite from
Montpelier Mine (Bowe Farm Prospect; Feldspar Corporation Quarry), Montpelier, Hanover County, Virginia, USA


Locality type:Mine
Classification
Species:Prehnite
Formula:Ca2Al2Si3O10(OH)2
Comments:Occurs in a meta-anorthosite body in gneissic rock with pegmatite dikes.
Confirmation
Validity:Believed Valid
Data
Mineral Data:Click here to view Prehnite data
Locality Data:Click here to view Montpelier Mine (Bowe Farm Prospect; Feldspar Corporation Quarry), Montpelier, Hanover County, Virginia, USA
Data Identifiers
Mindat Occurrence Record ID:65294
Long-form Identifier:1:3:65294:6
GUID (UUID V4):0
References
Rocks & Min.:60:167 & 61:57-61.
 
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