“A vial filled with bright yellow sideronatrite, formed as a post-mining secondary mineral inside the coal mine. Zodrow and McCandlish (1978) note that it forms as a fibrous crust on coal and is stable in surface conditions. They also note it can be confused with jarosite, and that other reports of jarosite are possibly also sideronatrite. Nova Scotia Museum of Natural History specimen 979GM0064.001. Erwin L. Zodrow and Keith McCandlish (1978) Hydrated Sulfates in the Sydney Coalfiled, Cape Breton, Nova Scotia. Canadian Mineralogist: 16: 17-22. Thanks to Tim Fedak and the NSMNH for allowing the photo to be taken and shared. ”