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This Specimen has been sold.
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2.4" Extremely Fluorescent Botryoidal Hyalite Opal - Nambia
This is a gorgeous 2.4" wide hyalite opal specimen, collected from Erongo Region of Namibia. The opal formed over black tourmaline crystals which can still be found along the bottom of the specimen. Under both longwave and shortwave UV light, the hyalite opal exhibits a vibrant green fluorescence. The reaction to shortwave UV is a result of trace uranyl ions.
It has been mounted to an acrylic display base with mineral tack.
It has been mounted to an acrylic display base with mineral tack.
Hyalite Opal
Hyalite is a transparent to translucent variety of opal that typically bears a globular structure. An amorphous form of silica (SiO2), hyalite opal forms as a volcanic sublimate in volcanic or pegmatic rock and is thereby considered a mineraloid. It can be referred to as water opal, jalite, or even Muller's glass, named after the man who discovered it, Franz-Joseph Müller von Reichenstein. It has a hardness of 5.5–6 on the Mohs scale and exhibits conchoidal fracturing.
Hyalite is a transparent to translucent variety of opal that typically bears a globular structure. An amorphous form of silica (SiO2), hyalite opal forms as a volcanic sublimate in volcanic or pegmatic rock and is thereby considered a mineraloid. It can be referred to as water opal, jalite, or even Muller's glass, named after the man who discovered it, Franz-Joseph Müller von Reichenstein. It has a hardness of 5.5–6 on the Mohs scale and exhibits conchoidal fracturing.
SPECIES
Opal var. Hyalite & Tourmaline var. Schorl
LOCATION
Erongo Region, Namibia
SIZE
2.4" wide
CATEGORY
SUB CATEGORY
ITEM
#296467
