Yes the granite will dissolve over time and release calcium citrate. I couldn’t figure out why the food bowl was so gritty when I made their morning porridge - then I was going through the ingredients, it’s a very fine sandy grit.Huh?
I thought they served very different functions.
- Limestone, oyster shell, egg shells all dissolve in the digestive system to provide calcium.
- Granite stays for some time in the gizzard and acts instead of teeth to grind up food.
Is limestone granite a mix of limestone and granite? They are very different rocks!
Yours also go outside so they may pick up granite for themselves.
And yes my gang has ready access to limestone screenings which I use for setting my paver bricks. The beasts are good at digging out the screenings from between the bricks - I am constantly having to fix the bricks, replace the screenings between them.
Brats I tell you brats!