Colorful Rainbow Anthracite / Peacock Coal I Mined in Tresckow, PA

658 views · Published 18 November 2018 · 1:03 · Indexed 4 November 2026

Channel: DigDigDig · 2018 · Science & Technology

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This coal has traditionally been called "peacock coal", or sometimes "Rainbow Anthracite"... since the flash and shine of these are so distinct.  The iridescent colors are caused by a thin mineral layer which refracts light and causes a splash of rainbow color, similar to how oil on water causes iridescence. 

From what I have gathered, this mineral layer is usually iron oxide from pyrite, chalcopyrite, and/or hematite(and sometimes sulphur dioxide from sulphur) that seeps in the seams and cracks of the coal.

This specific piece is sold, more will be listed sporadically on my eBay here: https://www.ebay.com/sch/herkimerdiamonds/m.html?_trksid=p3692

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