11-12. Aragonite #1.
Aragonite. From the kingdom of Aragon to the Caves of New Mexico and the ocean in between, aragonite is going to be the mineral for week #46. Aragonite is the main component of many organic substances, such as pearl and coral and has been successfully tested for the removal of pollutants from contaminated wastewaters. Its crystal is orthorhombic, dipyramidal and has a Pm symmetry.