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RM1638   Grunerite, var. amosite

Penge Mine, Sekhukhune, Limpopo, South Africa

A good-sized specimen of this monoclinic amphibole named grunerite, which in its fibrous form is called "amosite". The name has also been used to refer to other members of the group, and form series with cummingtonite. Grunerite is defined as a monoclinic amphibole belong to the magnesium-iron-manganese amphibole subgroup. A worldwide classic from this South African locality.

Size: 7.0 x 3.8 x 3.0 cm.

Excol. Lluís Daunis & Maria Ruscalleda.
Classic locality