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A superb thumbnail with an incredibly lustrous idealized 1.2cm crystal with a smaller sister beneath. From the Marty Zinn thumbnail collection, for which he paid $200 in 2009. Competition quality.

Locality: N’chwaning Mine, Southern Cape Province South Africa

Composition: a complex oxide of manganese containing both di- and tri-valent manganese

Dimensions: 2.1 × 1.4 × 1.3 cm
SKU: Geo-3442 Categories: , ,
Dimensions: 2.1 × 1.4 × 1.3 cm