mr fossil Posted August 20, 2022 Share Posted August 20, 2022 I found this weird rock around limestone of Paleogene age near Khurais east of Riyadh Saudi Arabia. is it a agate? and how does it form. thank you all for your time! 1 Link to comment Share on other sites More sharing options...
Ludwigia Posted August 20, 2022 Share Posted August 20, 2022 Agate is a silica. Test it for hardness (7) and streak (white). 1 Greetings from the Lake of Constance. Roger http://www.steinkern.de/ Link to comment Share on other sites More sharing options...
mr fossil Posted August 20, 2022 Author Share Posted August 20, 2022 4 minutes ago, Ludwigia said: Agate is a silica. Test it for hardness (7) and streak (white). I did. It’s definitely not quartz since it’s easy to break. It’s closer to a chalky limestone type. Link to comment Share on other sites More sharing options...
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