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While externally similar shapes, these two minerals are very different inside.
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Plagioclase from
Sunset Crater (Sunset Peak), San Franciscan volcanic field (San Francisco Peaks; San Francisco Mts), Coconino County, Arizona, USA


Locality type:Crater
Classification
Species:'Plagioclase' (not an IMA approved species)
Formula:(Na,Ca)[(Si,Al)AlSi2]O8
Confirmation
Validity:Believed Valid
Data
Mineral Data:Click here to view Plagioclase data
Locality Data:Click here to view Sunset Crater (Sunset Peak), San Franciscan volcanic field (San Francisco Peaks; San Francisco Mts), Coconino County, Arizona, USA
Data Identifiers
Mindat Occurrence Record ID:720244
Long-form Identifier:1:3:720244:5
GUID (UUID V4):0
Nearest other occurrences of Plagioclase
20.5km (12.8 miles) ⓘWinona meteorite, Winona, Coconino County, Arizona, USA
22.8km (14.2 miles) ⓘFlagstaff, Coconino County, Arizona, USA
37.0km (23.0 miles) ⓘRed Mountain, San Franciscan volcanic field (San Francisco Peaks; San Francisco Mts), Coconino County, Arizona, USA
61.1km (38.0 miles) ⓘCoon Butte meteorite, Coconino County, Arizona, USA
97.5km (60.6 miles) ⓘOrphan Mine (Orphan lode), Grand Canyon Village, Orphan Mining District, Coconino County, Arizona, USA
References
S.L. Hanson (2011) Northern Arizona Volcanoes: Spectacular Volcanic Eruptions that Changed the Landscape Forever. The 38th Rochester Mineralogical Symposium, April 14-17 2011, program notes, pp 44-49.
 
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