Mexican Hyalite Opal Collector Grade Specimen Stone on Matrix – UV Reactive Fluorescent – 59 grams #24

Mexican Hyalite Opal Collector Grade Specimen Stone on Basalt Rock, UV Reactive

Country of Origin: San Luis Potosi, Mexico

10-point scale of mineral hardness: 5.5 – 6.5 (10 – Hard, 1 soft)

Treatment: Raw, unfinished

Quantity: 1 raw Hyalite opal stone. You will receive the exact stone in the photos.

Weight: 59 grams

Size: 2.7cm in height x 5.6cm in width x 3.5cm in depth

Opal size: 1.3cm in height x 5.1cm in width x 2cm in depth

Care has been taken to ensure that weights and measurements are as accurate as possible, however please do note that these are only approximate.

We have tried to capture the beautiful colour tones as best we can in a photograph. They have been photographed under UV light to show the unique character of the stone.

Hyalite is a special variety of opal which is colourless. It grows in volcanic formations. Although these stones do not show the normal typical opalescence you see from an Opal, they have their own unique character which is fluorescence. Hyalite contains trace amounts of uranium within its silica structure, causing it to glow bright green when under ultraviolet (black light) which is very rare in the mineral kingdom. Each specimen will have some area of grape-like botryoidal growth and range in translucence from clear to milky or gold colouring and can be found within a matrix of Basalt rock or Chalcedony Agate.