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: La Ventilla, Villa de Reyes Municipality, San Luis Potosí, Mexico
Specimen Size: 2.8 x 2.3 x 2.0 inches
Specimen Weight: 3.9 ounces
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5 × 5 × 5 in
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Cluster of bipyramidal CALCITE crystals with a maroon color, most likely from inclusions of iron. The largest crystal is 1.5 inches in length. The specimen is museum size, 6.1 inches in length.This specimen is from the collection of Roger Maynard. Roger is a friend and was a long-time geologist with the US Geological Survey.
You are purchasing One (1) pen. The picture shows what the pen looks like all around in four photographs.
The GMM Opal Rollerball Pen is made GMM (Genuine Man Made) Opal. It is 20% silica and 80% resin.
The fire sparkles brightly in many colors. The photographs don’t do the opal justice as white opal doesn’t photograph well. It really sparkles even more than the far right of the picture! The fire also changes color in different light and when viewed from different angles.
The metal parts are finished in gun metal and gold plated.
The pen is 5 1/2 inches long and weighs 2.15 ounces.