Opal (var: Opal-AN) / (var: Hyalite Opal) (“Blood Vessel Opal”)A rarely seen matrix specimen of Hyalite from San Luis Potosi, Mexico featuring bead like gemmy, colorless spheres which are included with a small amount of orange iron oxide to give it the blood vessel like inclusions, hence the nickname Blood Vessel Opal. Interestingly enough, the piece has a dual texture effect where some of the globules are perfectly smooth, while others have an alligator skin appearance on the surface. One can spend a great deal

black minerals or minerals of Myanmar

it’s superb for what it is

hydrated iron aluminum phosphate and some of the better and more unique specimens of this mineral come from Llallagua

This is an example of a non-pegmatite gem mineral of which many collectors probably do not have a good specimen in their collections

as the piece is 100% crystallized all over

sharp "sword"-shaped prisms intermixed with contrasting red argillaceous sandstone

I must stress that the Wavellite crystals are also very gemmy

Specimen # BULG4116

Specimen # HYALMEX41615

but these crystals are found in hydrothermal tin veins where there is an absolute absence of Thorium (usually a trace element in Monazite)

The piece has fine

the piece displays a strong red fluorescence