This Rock Looks Like A Booger #opal #hyalite #crystals #minerals #nature #science #coolerocks

Because I'm in a hurry here is some information about the booger rock - hyalite opal via mindat. Which is a very wonderful source for mineral information and identification.

Formula: SiO2 · nH2O
Colour: Colorless, white, creme-colored, yellow, orange
Lustre: Vitreous, Sub-Vitreous
Hardness: 5½ - 6½
Specific Gravity: 2.0 - 2.2
Name: Named from ύαλος ('glass') from its appearance, by A.G. Werner in 1794.
A colourless variety of Opal-AN, an amorphous silica-glass containing about 3-8% water.

Because it has a different structure, it does not show the opalescence (play of color) that is found in precious opal.

Hyalite occurs as globular and botryoidal masses and irregular crusts in volcanic and pegmatite environments where the silica deposits from the gas phase (Flörke et al, 1973). It often shows a strong green fluorescence in UV light.

The refractive index varies slightly with water content and lies between 1.44 and 1.46 (Graetsch, 1994). Hyalite is optically isotropic, but may show strain birefringence (Graetsch, 1994).

#opal #hyalite #fluorescent #minerals #crystals #gems #science

Видео This Rock Looks Like A Booger #opal #hyalite #crystals #minerals #nature #science #coolerocks канала Mooney Fine Mineral