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While externally similar shapes, these two minerals are very different inside.
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Fassaite from
Vico volcanic complex (Vico Lake), Viterbo Province, Lazio, Italy


Locality type:Complex
Classification
Species:Augite var: Fassaite
Formula:(Ca,Na)(Mg,Fe2+,Al,Fe3+,Ti)[(Si,Al)2O6]
Confirmation
Validity:Believed Valid
Data
Mineral Data:Click here to view Fassaite data
Locality Data:Click here to view Vico volcanic complex (Vico Lake), Viterbo Province, Lazio, Italy
Data Identifiers
Mindat Occurrence Record ID:189452
Long-form Identifier:1:3:189452:3
GUID (UUID V4):0
References
Lapis 28(12), 19-28 (2003)
 
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