Calcite (classic material)

Item Description

A classic Calcite specimen from Naica featuring well-formed, blocky off-white colored rhombs measuring up to 2.4 cm with minor Sphalerite and Galena on the back. The Calcites have an almost chatoyant appearance when they are rotated in the light, and if you look closely, you can see tiny "teeth"-like modifications on certain faces.
From the worldwide mineral collection of Albert Lewis Kidwell (January 1, 1919 - August 16, 2008). Al was a well-known mineral collector and research geologist with Carter Oil Company and later Exxon Oil Company in Houston, Texas. The phosphate species Kidwellite was named in his honor in 1974 ( https://www.mindat.org/photo-326405.html ).