and the mining districts of southern Illinois

Amethyst is the traditional February birthstone

Chrysoprase is chalcedony—cryptocrystalline quartz—colored by trace nickel silicate dispersed through its microcrystalline structure

A collector's point for a shelf

Scotland named smoky quartz its national gem

Sedona Red Rock Heart size:1.1"L x 1.4"W x 0.7"T and the mining districts ofSedonas Permian sandstone, carved into a heart 270 million years of geology in a classic form. The red rock formations surrounding Sedona are principally the Schnebly Hill Formation a sequence of sandstones and mudstones laid down approximately 270280 million years ago in coastal and shallow marine environments. The iron content of those ancient sediments was exposed to oxygen as the sea retreated, oxidizing to hematite and staining the rock in tones