This thought got me thinking about sources of quartz to use for grit. My flock have been crossing through the woods into a little holler to pick for grit and I'd prefer they not go that far out of the meadow, so I decided to find them some quartz for grit. Found some 4 lb bags of quartz at Lowe's in the garden center. They went through a 4 lb bag of quartz in under a week and repeated that not long after when I got them another one. That's a lot of rock for a flock of 14 birds and I'm not seeing any in the stool, so not sure what to think about that. I'm not seeing much difference in their intake or weight with the addition of more grit to their diet, so not sure I'll keep repeating that process too often, but have an extra bag of quartz on hand for the next time I see them using the holler a lot for picking up quartz.