What is opal? Cat's eyes? Are you misunderstood? . . The opal can be as scary as the cat's eyes. So what is the opal? Let's take a look at it with Xiaobian.
What is the opal?
Opal often serves as a ring face, and the best opal is produced in Sri Lanka from the East. "Cat's eye" is a gold emerald with cat's eye effect. The chemical composition of gold emerald is yttrium aluminate. The crystal is columnar or plate-shaped. It can be brown, green and yellow. Gloss, hardness 8.5, specific gravity 4.73; shell-like fracture, streak white.
When it has densely oriented fibrous and acicular mineral inclusions or tubular holes in its interior, it will produce a bright band like the cat's eye pupil due to the reflection of light. This is the cat's eye effect. When the gemstone is turned, this bright band will move on the surface of the gemstone, so it is also called "play color", which is the most important feature of the opal.
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