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Image: Magnetite-rw16b

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Description: Magnetite Locality: ZCA Mine No. 4 (St Joe Mine; ZCA No. 4 mine), Balmat, Balmat-Edwards Zinc District, St Lawrence County, New York, USA (Locality at mindat.org) Size: cabinet, 11.5 x 4.6 x 4.5 cm Magnetite In the 1980s and early 1990s, the mineral collectors who pay attention to Eastern US material were shocked at the sudden appearance of incredible, lustrous, jet-black magnetite crystals up on the market from out of this deep mine (it extended down to 2500 feet according to MINDAT). These are, I think, among the world's finest magnetites for their amazing metallic lustre and unusually sharp cubic habits (most magnetite is octahedral). This specimen is a rare cabinet piece featuring sharp crystals to nearly 1.5 cm, although the best crystal is on the left hand portion, and is 1 cm across. A superb example from a now closed and defunct locality which, for a brief time, really gave collectors something unprecedented. Ex. Robert Whitmore Collection.
Author: Robert M. Lavinsky
Usage Terms: Creative Commons Attribution-Share Alike 3.0
License: CC-BY-SA-3.0
License Link: http://creativecommons.org/licenses/by-sa/3.0/
Attribution Required?: Yes

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