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.
HYALITE is a colorless variety of Opal. Hyalite has a different internal structure than that found in Precious Opal. Thus, Hyalite does not exhibit the opalescence that is found in Precious Opal. However, Hyalite does fluoresce green under a short-wave ultraviolet light. Hyalite occurs as globular and botryoidal masses and irregular crusts in volcanic and pegmatite environments. Hardness is 5.5 – 6 on the Mohs scale.
Location: La Ventilla, Villa de Reyes Municipality, San Luis Potosí, Mexico
Specimen Size: 1.7 x 1.1 x 0.8 inches
Specimen Weight: 0.7 ounces
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NEVADA – JACKPOT! Mint condition. One of my favorite books from the monograph series from Lithographie, Inc. Some 124 pages with 16 chapters written by experts around the world. Chapters on gold and silver mining, barite from Meikle mine, turquoise, opal, garnets, stibnite and famous locations such as Hallelujah Junction and Majuba Hill mine. A map of Nevada Mineral Localities is included.
HESSONITE is a variety of GROSSULAR GARNET. This specimen is orange in color, gemmy and translucent. Luster is adamantine and size is thumbnail (1.0 inch). From the famous Jeffrey Mine in Quebec, Canada. This piece is from the collection of Roger Maynard. He is a friend and long-time geologist with the US Geological Survey in New Mexico.