What is fairy opal?

[KLC]

I ran across a fairly pretty opal described as fairy opal. I'd never heard of them before. Are they real? It's treated. Is that normal for this type of opal?

 

[Daisys and Diamonds]

@Bron357 do you know ?

 

[V_sh]

I ran across a fairly pretty opal described as fairy opal. I'd never heard of them before. Are they real? It's treated. Is that normal for this type of opal?

Hi,

it is Opalised Sandstone which goes under color treatment to have a black matrix color.

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