The good news is that because it’s in the collectibles section you don’t need to worry about accidentally selling it which, given how hard it is to find, is a huge relief. It’s described as a ‘unique glass fragment found in tombs and used as a decorative ornament'. First off, you can check how many you’ve already got in the resources section of your inventory screen.
The majority of the ancient mechanisms across Egypt only require five silica but one special one that can uncover needs 50 before it'll yield.
