[Krystyna]

Opal Chocolate
https://geologyscience.com/gemstone/chocolate-opal/
https://thegemlibrary.com/chocolate-opal...-and-more/
https://sagecrystals.com/blogs/propertie...olate-opal
https://crazicarmascrystals.com/products...7g-sn37041

[Krystyna]

https://assets3.fossilera.com/sp/563266/...silica.jpg
https://www.fossilera.com/minerals/1-7-e...a-ridge--2

[Krystyna]

https://shimillion.com/wp-content/upload...-12192.jpg
https://shimillion.com/wp-content/upload...2/1-49.png
https://shimillion.com/product/83-5-cara...100127049/