This is a large (25cm x 15cm x 15 xm) coralloid formation of Aragonite from Santa Eulalia, Chihuahua, Mexico. I don't know if coralloid...

This is a nice little gemmy Adamite from the Ojuela Mine, Mapami, Durango, Mexico. It is pretty small (4.2 cm x 3.1 cm x 1.6 cm, 28.3...

I have happily been using and recommending the Convoy S2+ 365 nm UV flashlight since early 2017 when Mark Cole first posted about it. It...