Onyx Marble Classification
Marble Onyx, Banded Calcite
cleavage, refractive index, birefringence (using distant vision method), specific gravity. Use birefrigence blink method.
When banded and Translucent to opaque, the calcite variety is referred to as "onyx marble," although some disfavor this nomenclature. Misnomers: Oriental alabaster, Mexican onyx and California onyx. Type of limestone used for ornamental objects.