Water Opal

Water Opal is a transparent, nearly colorless opal that resembles clear water or jelly. It is sometimes called jelly opal, and closely related to hyalite (glass-clear opal) and girasol opal (which shows a bluish floating glow).

When it contains ordered silica spheres, water opal can show faint to vivid play-of-color suspended in an otherwise clear body, an effect prized for its ethereal, floating appearance. Mexican deposits are a classic source.

Its glassy clarity sets it apart from milky common opal, and fine play-of-color water opal is sought by collectors for its delicate, transparent beauty.

Water opal forms when very pure, silica-rich water deposits hydrated silica with few coloring impurities, yielding a clear, glass-like body. Low iron and carbon content keeps it colorless.

Hyalite, a closely related clear opal, often forms as glassy botryoidal crusts directly from silica-bearing vapors and solutions in volcanic cavities. Mexican water and fire opal districts are well known for transparent material.

Where the silica spheres are uniform and ordered, the otherwise clear opal can also diffract light into play-of-color, producing transparent precious water opal. Sources include Mexico, Ethiopia, and various volcanic regions.

Identify water opal by its transparency and watery, jelly-like clarity, often with a slight bluish glow (girasol effect) or faint internal flashes of color.

Opal is amorphous, hardness 5.5-6.5, with vitreous luster and conchoidal fracture. Its clarity distinguishes it from milky and common opal, while any directional internal color confirms it is opal rather than glass.

Distinguish it from clear glass and quartz: opal is softer than quartz (7) and warmer than glass, and may fluoresce green (hyalite fluoresces under UV due to trace uranium). True water opal shows a soft internal glow rather than a hard, bubble-bearing transparency.

Water Opal is used in jewelry as cabochons and, when stable, faceted stones, valued for its watery clarity and any subtle floating play-of-color. Girasol and hyalite material is popular with collectors.

Clear specimens, especially fluorescent hyalite, are also collected as mineral specimens rather than cut gems. Stones with bright internal color are the most valuable.

Metaphysically opal is associated with clarity, emotion, and inspiration. These are traditional beliefs rather than scientifically established properties.