Over 5 inches, this is a large, 100% natural, captivating, translucent to transparent Opal variety Hyalite, a.k.a. Hyalite Opal, on Chalcedony with exceptional glassy, bubbly botryoidal habit that solidified into both botryoidal* and stalactite or stalagmite-like formations. When exposed to UV light this piece fluoresces with a bright yellow-green glow. Definitely a wild looking piece with what looks like otherworldly terrain. This stunning, larger specimen presents with much taller Hyalite Opal growth than usual. The Hyalite Opal is growing on what looks like an island of quartz var. chalcedony and much less of the usual rhyolitic tuff matrix that is often associated with this mineral formation.

335 grams; 5.10" x 3.64" x 2.20" or 129.6mm x 92.6mm x 55.8mm

Source: Electric Opal Knob location, Zacatecas, Mexico

*There a couple of areas where the botryoidal formation fractured and separated due to the heat present when silica accumulated during a gas phase and it appears that some "re-crystallization" has begun to take place in those areas. Due to the complex bubbly form of this incredible piece, those areas seem to blend into their surroundings. With highest respect to protecting and presenting the natural state of the crystals, it is normal that there remains small amounts of sediment or Rhyolite tuff trapped within and in between the Hyalite spherules. Truly an excellent example of the species!  More information further in the description. 

^ Purchase with confidence from knowledgeable mineral collectors and sellers, constantly placing the highest priority on accuracy, knowledge and service to you, the collector or gift giver. 

At first glance, it is sometimes astonishing to know that Hyalite Opal is a solid mineral. The bubbly well formed botryoidal habit exhibited in this piece looks like soap bubbles that have been frozen in time.  

Creation: The captivating bright green fluorescent characteristic is what sets this Hyalite variety of Opal apart from other types that show flashes of color. The glow is truly remarkable! Hyalite Opal from this location forms on a Rhyolitic tuff found on layers of volcanic crusts and pegmatite surroundings where silica accumulates from a gas phase. Sometimes the botryoidal Hyalite grows on a layer of also botryoidal Quartz var Chalcedony that coats the Rhyolitic tuff. The botryoidal spherules are a hydrated silicate or solidified silica gel containing about 3 to 8% water. The solidification of Hyalite Opal culminates to a hardness of 5 to 6.5 on the Mohs scale, not far from the hardness of Quartz! Though not showing the same opalescence as other varieties of Opal, a soft play of color in the form of rainbow like ripples can sometimes be seen with magnification. 

Over 5 inches, this is a large, 100% natural, captivating, translucent to transparent Opal variety Hyalite, a.k.a. Hyalite Opal, on Chalcedony with exceptional glassy, bubbly botryoidal habit that solidified into both botryoidal* and stalactite or stalagmite-like formations. When exposed to UV light this piece fluoresces with a bright yellow-green glow. Definitely a wild looking piece with what looks like otherworldly terrain. This stunning, larger specimen presents with much taller Hyalite Opal growth than usual. The Hyalite Opal is growing on what looks like an island of quartz var. chalcedony and much less of the usual rhyolitic tuff matrix that is often associated with this mineral formation.

335 grams; 5.10" x 3.64" x 2.20" or 129.6mm x 92.6mm x 55.8mm

Source: Electric Opal Knob location, Zacatecas, Mexico

*There a couple of areas where the botryoidal formation fractured and separated due to the heat present when silica accumulated during a gas phase and it appears that some "re-crystallization" has begun to take place in those areas. Due to the complex bubbly form of this incredible piece, those areas seem to blend into their surroundings. With highest respect to protecting and presenting the natural state of the crystals, it is normal that there remains small amounts of sediment or Rhyolite tuff trapped within and in between the Hyalite spherules. Truly an excellent example of the species!  More information further in the description. 

^ Purchase with confidence from knowledgeable mineral collectors and sellers, constantly placing the highest priority on accuracy, knowledge and service to you, the collector or gift giver. 

At first glance, it is sometimes astonishing to know that Hyalite Opal is a solid mineral. The bubbly well formed botryoidal habit exhibited in this piece looks like soap bubbles that have been frozen in time.  

Creation: The captivating bright green fluorescent characteristic is what sets this Hyalite variety of Opal apart from other types that show flashes of color. The glow is truly remarkable! Hyalite Opal from this location forms on a Rhyolitic tuff found on layers of volcanic crusts and pegmatite surroundings where silica accumulates from a gas phase. Sometimes the botryoidal Hyalite grows on a layer of also botryoidal Quartz var Chalcedony that coats the Rhyolitic tuff. The botryoidal spherules are a hydrated silicate or solidified silica gel containing about 3 to 8% water. The solidification of Hyalite Opal culminates to a hardness of 5 to 6.5 on the Mohs scale, not far from the hardness of Quartz! Though not showing the same opalescence as other varieties of Opal, a soft play of color in the form of rainbow like ripples can sometimes be seen with magnification.