8.1 x 7.1 x 6.9 cm. This is still a poorly categorized mineral, originally described from near Havana, La Habana Province, Cuba. It is a magnesium iron silicate that is not yet formally approved as a species pending more work. This specimen is very rich with the material, dark black masses within the lightweight matrix. Note late 1800s AE Foote label. Ex. Academy of Natural Sciences Philadelphia Collection.
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