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Antimony

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Colour image of brown rock with smooth edges and some sheen
Antimony. Devonian. Lake George(?), New Brunswick. New Brunswick Museum (NBMM 2005). Image width 5 cm. Lake George is a polymetallic mineral deposit and formerly the largest antimony producer in North America. The geology is an Early Devonian granodiorite stock, perhaps about 412 million years old, produced as part of a volcanic island arc setting. Quartz veins containing stibnite and molybdenite cut the Lake George granodiorite stock. Sources of antimony included both the mineral stibnite and native antimony.