I suspect that stone dust generally will be found to be similarly harmful to asbestos.
Asbestos is apparently worse because of the sharp edges of the particles, but if I put any angle grinder dust under the microscope I see plenty of sharp bits too.
I think the actually harmful thing is that the dust is 'fresh' rather than being the result of years of chemical weathering which tends to smooth off the sharpest pointiest bits at nanometer scale.
The effects of stone dust are pretty well understood - silicosis is deadly and similarly harmful as asbestosis, and both raise the risk of lung cancer, but I don't believe there is anything like mesothelioma related to quartz dust which is the real horror of asbestos.
I already commented above but no, they aren't - silicosos is similar to one of the several possible diseases asbestos can give you, asbestosis, but mesothelioma is the real horror outcome from asbestos exposure which I don't believe silica has any kind of similar connected disease.
Asbestos is apparently worse because of the sharp edges of the particles, but if I put any angle grinder dust under the microscope I see plenty of sharp bits too.
I think the actually harmful thing is that the dust is 'fresh' rather than being the result of years of chemical weathering which tends to smooth off the sharpest pointiest bits at nanometer scale.