The Hyalite Opal is the clear, globular layer on top of the white Milk Opal in this specimen. The Hyalite fluoresces a brilliant green under a short-wave UV light. In this specimen, the Hyalite is transparent.
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:Â La Ventilla, Villa de Reyes Municipality, San Luis PotosÃ, Mexico
Specimen Size: 2.8 x 2.3 x 2.0 inches
Specimen Weight: 3.9 ounces
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