Calcite (twinned) - Basalt Quarry, Ambariomiambana, Sambava Dist., Sava, Madagascar More info: https://www.irocks.com/minerals/specimen/52115 This is a sharp, large, gemmy thumbnail sized example from the one time find of spectacular calcite from Madagascar of this style. They were found and brought to market by Laurent Thomas in 2011-2012. Alex purchased this from Laurent (Polychrome Minerals, France), March 2012, for his calcite suite. Exhibited: The 2012 49th Munich Gem and Mineral Show’s Afr

A CAT D10T2 ripping basalt in an Icelandic quarry. Look out for a feature on this project in a forthcoming issue of Awesome Earthmovers online magazine. | RPA Media

Examine the origins and characteristics of two types of rock—basalt and granite—that cover the ocean floor and much of the land surface of Earth, in this video from "NOVA: Making North America: Origins" https://bit.ly/30cWPtZ | NOVA Education