Welcome to Workshop @admacp. I trust you will receive lots of great assistance and inspiration for your projects from our members. We're pleased you could join us.
Could you please tell us a bit more about the splashback and/or provide another photo? I'm having trouble making out what kind of material it is from your original picture and suspect others will also need more information to help identify it and provide you some advice.
Please let me know if you ever need a hand getting the most from the site. I'm always happy to help.
Can I ask why you are looking for help @admacp? Has it been damaged or do you want to install something just like it somewhere else?
I would start here - https://www.bunnings.com.au/our-range/kitchen/splashbacks
From your photos it is very hard to tell what the material is, whether it is real stone or something else.