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Description:Moderately lustrous and lightly iridescent, charcoal-gray, bornite crystals (to about 1.5 cm) are very well-placed amongst sharp, water-clear, quartz crystals on this excellent, combination, old-timer from the famous mines at Butte. Classic and very showy material, with the quartz spikes as perches for bornite...not as ugly as most from here! Ex Robert Whitmore Collection. Valued $400-500