How to identify Opalite

To correctly identify Opalite (Synthetic Opal), check each of these features in order. Many rocks and minerals look alike, so cross-reference multiple properties before deciding.

Step-by-step identification

1. 1

   Color

   Overall color and any zoning or banding

   Typically milky white, bluish-white, or pale blue, often with an orange or amber tint when backlit. It lacks the distinct spectral 'play-of-color' of precious natural opal.

2. 2

   Luster

   How the surface reflects light: metallic, vitreous, dull

   Vitreous (glassy) to resinous.

3. 3

   Texture

   Grain size and surface feel: coarse, fine, glassy

   Smooth, often polished. May show conchoidal fracture surfaces if broken.

4. 4

   Crystal Form

   Shape of visible crystals or crystal faces

   Amorphous (no crystal structure), as it is a glass or resin.

5. 5

   Cleavage

   How it breaks: flat cleavage planes vs irregular fracture

   None, as it is amorphous.

6. 6

   Geological Environment

   The rock formation and setting where it occurs

   Not found in geological environments; it is manufactured in industrial settings.

Key Facts

Hardness

Approximately 5.5-6 on the Mohs scale (for glass varieties).

Specific Gravity

Approximately 2.65-2.80 (for glass varieties), varying with composition.

Crystal System

Amorphous (non-crystalline).

Color

Milky white, bluish-white, pale blue; often with an orange/amber glow when backlit.

Luster

Vitreous (glassy) to resinous.

Transparency

Translucent to semi-translucent.

Fracture

Conchoidal (shell-like).

Cleavage

None.

Composition

Primarily silica-based glass, sometimes with additives like rare earth elements, or a synthetic resin.

Physical characteristics

• Crystal Habit: Massive, amorphous.
• Cleavage Type: None.
• Fracture Type: Conchoidal.
• Tenacity: Brittle.
• Luster Type: Vitreous (glassy) to resinous.

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