Opal: Cat's eye, that is, "golden emerald with cat's eye effect".

Tiger Eye Stone: Tiger Eye Stone, also known as Tiger Eye Stone, is a kind of jewel with cat's eye effect, mostly yellow-brown, with silky light lines inside.

2, the chemical composition is different:

Opal: BeAl2O4

Tiger eye stone: SiO? 2?

Extended data:

Features:

Tiger's eye stone is often cut with convex gems, which can best highlight the cat's eye of the tiger's eye stone itself.

Tiger's eye stone can turn red after micro-thermal processing. The beautiful honey-colored tiger's eye stone may be passed off as another kind of higher-value cat's eye stone "golden emerald". Gemstones made of artificial glass fiber are common substitute stones for tiger's eye stone, and this kind of glass fiber can also be made into many kinds of gems.

In addition, there is a kind of rock related to tiger eye, called iron tiger eye. Iron tiger eye stone is a kind of ore infiltrated with natural tiger eye stone, ruby and black hematite. Its color and light contrast is gorgeous, and it is often made into jewelry, high-priced decorations, prayer beads and gems embedded in handles.

Baidu encyclopedia-opal

Baidu Encyclopedia-Tiger Eye Stone