Calcite dogtooth gemstone on Basalt in Valcan Quarry, USA

Calcite dogtooth gem on Basalt
 
 Gemstone Dogtooth Calcite Crystal Coin on a Magnificent Volcanic Basalt!
 Ideal for a collector, this Calcite mineral will bring satisfaction to enthusiasts and connoisseurs!
 Magnificent and RARE piece!
 
 Video: https://www.youtube.com/watch?v=YAf_pE7csbo
 
 Origin: Valcan Quarry, Racine, Wisconsin, USA
 Size: 17cm by 11cm by 7cm
 Weight: 1kg608
 Chemical formula: CaCO3
 Crystal system: Trigonal
 Hardness Mohs scale: 3
 Wikipedia definition: Calcite is a chemical or biochemical (biomineralization) mineral composed of natural calcium carbonate with the formula CaCO3, with traces of Mn, Fe, Zn, Co, Ba, Sr, Pb, Mg, Cu, Al, Ni, V, Cr and Mo. The abundance of cations other than calcium explains the richness of the varieties described for this mineral.