Calcite : CaCO3, Chalcopyrite : CuFeS2

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Copyright © Rob Lavinsky & MineralAuctions.com
minID: Y17-67E

Calcite : CaCO3, Chalcopyrite : CuFeS2

Copyright © Rob Lavinsky & MineralAuctions.com  - This image is copyrighted. Unauthorized reproduction prohibited.
Dimensions: 6.8 cm x 4.9 cm x 3.9 cm

6.8 x 4.9 x 3.9 cm. Well-crystallized calcite specimens are uncommon from this famous New York lead-zinc district. In typical calcite fashion, the fact that calcite as a species has more habits than any other mineral is apparent in this unusual, and yet usual, cluster. The calcites are gemmy to translucent, and one of the rhombs has highly modified, beveled edges which act as clear windows into the main display crystal. This crystal is 4.4 cm across, and there are larger ones in the back. Not surprisingly, considering this came out of a Rossie type vein (rich in calcite, mined for lead), the calcite is contacted along the back and bottom. Moderate red fluorescence. What is most attractive, and fascinating, is the preferential intergrowth of chalcopyrite crystals on many, but not all, of the faces. To me, this is an always amazing mineralogical occurrence. Rare and excellent calcite for the locality, this was #7261 in Kay Robertson's collection. Photos by Jeff Starr.

This photo has been shown 55 times
Photo added:29th Jun 2019
Dimensions:3040x2617px (7.96 megapixels)
Date/Time of Photo:1st Jan 1980 00:01:36
Camera:CANON PowerShot G7 X Mark II
Software:Adobe Photoshop Elements 12.0 Windows
Exposure time:1/60s
Focal Length:9mm
ISO speed:320

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PhotosCalcite - Balmat, Balmat-Edwards Zinc Mining District, St. Lawrence Co., New York, USA

30th Jun 2019 20:18 UTCRichard Gunter Expert

What data would suggest that this sample came from a Paleozoic Age "Rossie-type" vein? There are very similar calcite-chalcopyrite +/- baryte samples that come from the tectonized portions of the Balmat area's Precambrian Age metamorphosed Zn deposits.
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