This Calcite is from near Durango, Mexico. The color is natural. The specimens are cleaned in a dilute acid that increases their shinyness. Emerald Calcite #1 Regular price: $8.95 Sale price: $7.45 Emerald Calcite #5 $6.95 If you are interested in more information for any listed or related items email us at olson352@aol.com (or go to information page).