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Author Topic: Grey blue rock  (Read 7149 times)

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VegasJames

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Re: Grey blue rock
« Reply #15 on: May 01, 2022, 06:49:07 PM »
Quote from: AgateLicker on April 26, 2022, 11:37:23 AM
Check if it reacts with acid. Anhydrite is calcium sulphate and should fizzy up nice. If not, nix that theory!

Anhydrite is dehydrated calcium sulfate, but it does not fizz with acid. Carbonates fizz with acid, such as calcium carbonate. This is why acids are used to differentiate between anhydrite stones such as angelite and calcium carbonate stones such as calcite, travertine and marble.
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AgateLicker

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Re: Grey blue rock
« Reply #16 on: June 10, 2022, 11:37:42 AM »
Thank you, VegasJames!
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