Stibnite is an Antimony Sulfide mineral. This specimen has one primary Stibnite crystal 5.4 inches long that is terminated at one end. The color is silver-gray. It has a metallic luster. The piece has many minor Stibnite crystals at one end. 

This specimen is entirely translucent Hyalite Opal except for a little bit of dirt on the bottom that I could not clean off. The Hyalite fluoresces a brilliant green under a short-wave UV light. 

Reddish-Pink RHODOCHROSITE with minor Tetrahedrite and Chalcopyrite from The Sweet Home Mine in Colorado.

Reddish-Pink RHODOCHROSITE with minor Galena and Pyrite from The Sweet Home Mine in Colorado.

Vitreous black TOURMALINE from the Harney Peak Pegmatite of South Dakota.

Cluster of brilliant emerald-green Dioptase crystals on matrix. The largest dioptase crystal is 0.5 inches. Crystals are rhombohedral shape. The specimen is from the type location for dioptase: Altyn-Tyube deposit, Karaganda Region, Kazakhstan.

Fluorite from Mount Antero (the highest mineral locality in North America)

Rare specimen

6 x 6 x 2 cm Specimen

2 x 2 x 1 cm Fluorite Crystal

Sold by Rocky Mountain Gems and Minerals 

Fluorite, Lead Hill, Cave-in-Rock District, Hardin County, Illinois

Unique specimen of white Colemanite crystals. A calcium borate mineral from Death Valley, California. The specimen was legally recovered prior to 2011.

Location: Sigma Pit, Ryan District, Death Valley, California, USA

Specimen size: 16.9 x 14.2 x 8.8 cm (6.7 x 5.6 x 3.5 inch) Cabinet

Specimen weight: 1,135 gr (2 lb 8.0 oz)

Museum-size Beryl variety Goshenite, with Scheelite and Calcite on Muscovite combo

Stunning color contrast of green Siderite “Blades” with brassy, iridescent Chalcopyrite crystals in this specimen. Several of the Siderite blades are 1-inch long. The luster of the Siderite is vitreous to pearly while the Chalcopyrite has a brilliant metallic luster.

Large Hessonite crystals with adamantine luster. Color is reddish-orange to brown. Largest Hessonite crystal is 4-cm long. Another is 2.7-cm. Minor Vesuvianite (green) in matrix.