There is beautiful lavender chalcedony from Indonesia that occurs in
thick seams. They have small nodules too.
Some of the deepest lavender chalcedony I’ve seen comes from Turkey
Holley Blue is a lavender agate from Oregon, the closest town to the
mine site is Holley although it’s just a small grocery/gas station,
elementary school and church.
Amethyst Sage agate from Nevada is nodules that have tan jasper
centers and gemmy purple chalcedony rinds, dendrites throughout.
There are also small nodules of lavender chalcedony from Mexico.
These are all natural stones that have, to the best of my knowledge,
Have fun !