Crystal System: Monoclinic
Status of Occurrence: Discredited Occurrence
Distribution: None - Discredited
Chemical Composition: Sodium magnesium iron aluminium silicate hydroxide
Chemical Formula: Na2(Mg,Fe2+)3Al2Si8O22(OH)2
Method(s) of Verification:

Chemical Group:

  • Silicates

Geological Context:

  • Metamorphic
Introduction: crossite is an abandoned term for a sodic blue amphibole now covered by the glaucophane-ferroglaucophane and riebeckite-magnesian riebeckite series (Leake et al., 1997).
Occurrence in Wales: see glaucophane and ferroglaucophane for details of blue amphibole occurrences in Wales.

Key Localities:

There are no key localities for this specimen.


  1. Leake, B.E., et al., 1997. Nomenclature of amphiboles: report of the subcommittee on amphiboles of the international mineralogical association, commission on new minerals and mineral names. The Canadian Mineralogist, 35, 219-246.