A palm-sized plate of brightly fluorescent fluorapatite crystals on a matrix of unknown identity. As shown in the photograph below, the...

Very nice cabinet-sized specimen of stalactitic aragonite (aka "Cave aragonite"), from the Santa Eulalia Mining District, fluorescing...

Very nice, large cabinet-sized specimen of stalactitic aragonite (aka "Cave aragonite"), from the Santa Eulalia Mining District,...

Shown here is a pretty small but nicely transparent, gemmy cleavage rhomb of "Terlingua-type" calcite from the Challenger Cave, Nuevo...

A few months ago, I purchased this nice and quite big cleavage rhomb of "terlingua-type" calcite, from the Challenger Cave, Nuevo Leon,...

This unique fluorescent specimen comes from the Palmarejo Mine, in Chínipas, Chihuahua, Mexico, and consists of a brightly fluorescent...

The Electric Opal Claim in Zacatecas, Mexico produced specimens of hyalite opal that were notable for having brilliant green fluorescence...

The El Refugio Mine, located in Choix, in the Mexican state of Sinaloa, is a notable source of beautiful specimens of the zinc carbonate...

The El Refugio mine, located in Choix, in the Mexican state of Sinaloa, is a notable source of beautiful specimens of the zinc carbonate...

This is a large, spectacular, plate of brightly fluorescent, plumose and needle-like calcite scalenohedrons from the San Antonio Mine,...