Handmade Natural Gemstone Opal Cabochon and Polished Sterling Silver Dangle and Drop Earrings, Welo Opal Silver Dangle and Drop Earrings,

Handcrafted Sterling Silver Earrings with Natural Ethiopian Opal Gemstones.

Earring size is 2.20 x 0.80 cm.

The earring weight is 4.50gm.

Gemstone Description: Opal
A blue-green section of opal encased inside a light brown rock
A rich seam of iridescent opal encased in matrix
General
Category Mineraloid
Formula
(repeating unit) Hydrated silica. SiO2·nH2O
Crystal system Amorphous[1] Identification
Color Colorless, white, yellow, red, orange, green, brown, black, blue, pink
Crystal habit Irregular veins, in masses, in nodules
Cleavage None[1] Fracture Conchoidal to uneven[1] Mohs scale hardness 5.5–6[1] Luster Subvitreous to waxy[1] Streak White
Diaphaneity opaque, translucent, transparent
Specific gravity 2.15+0.08
−0.90[1] Density 2.09 g/cm3
Polish luster Vitreous to resinous[1] Optical properties Single refractive, often anomalous double refractive due to strain[1] Refractive index 1.450+0.020
−0.080
Mexican opal may read as low as 1.37, but typically reads 1.42–1.43[1] Birefringence none[1] Pleochroism None[1] Ultraviolet fluorescence black or white body color: inert to white to moderate light blue, green, or yellow in long and short wave, may also phosphoresce, common opal: inert to strong green or yellowish-green in long and short wave, may phosphoresce; fire opal: inert to moderate greenish-brown in long and short wave, may phosphoresce[1] Absorption spectra green stones: 660 nm, 470 nm cutoff[1] Diagnostic features darkening upon heating
Solubility hot saltwater, bases, methanol, humic acid, hydrofluoric acid
References

Ethiopian Opal Round Shape – 8mm Cabochon polished