Ekanite vs Pumpellyite

Ekanite is a rare thorium-bearing calcium silicate mineral with the ideal formula Ca2ThSi8O20. It was first found in the Ratnapura area of Sri Lanka and is named for Sri Lankan gemmologist Francis Leo Danvil Ekanayake. Ekanite is usually green but can also be straw-yellow, dark red, or colorless, and its thorium content makes it radioactive. Radiation damage commonly leaves specimens metamict, mea...

Pumpellyite is a group of calcium, magnesium, aluminum, iron, and manganese silicate minerals formed mainly during low-grade metamorphism. It commonly occurs in altered volcanic rocks, especially where rocks have been affected by pressure, heat, and circulating fluids at relatively low temperatures. Pumpellyite is named after the American geologist Raphael Pumpelly and is primarily a mineralogical...