Boss Byproducts: Calthemites Are Man-Made Cave Dwellers - Some lovely orange calthemite flowstone colored so by iron oxide from rusting stee... - https://hackaday.com/2024/11/20/boss-byproducts-calthemites-are-man-made-cave-dwellers/ #calciumcarbonate #secondarydeposit #hackadaycolumns #chemistryhacks #originalart #calthemite #stalactite #stalagmite #chemistry #flowstone #ironoxide #concrete #deposit