There is a picture of the fluorescent one under UV light. It is on the second page of this post. It is hard to take a picture and get the color right with the UV light.You achieved a nice polish on that finished one. Do you finish the final stages with some type of polishing compound?
Could you take a picture under UV light of the smallest one and post the photo here please?
Geology is a subject I'd certainly like to know more about; but there are too many fascinating subjects in the world for the time we are permitted here.
During inclimate weather I have a rigid air filtration system I grind right in front of. I also use a good respirator, not a dust mask. They do not stop the fine dust particles. In good weather I still use a respirator but no filtration system. I have tons of stuff I have carved over the years. I give away some as gifts. I am amazed how long people hold on to them.Please tell us of the heavy ventilation you use, as I see no slurry marks on the grinder. Would really enjoy seeing your work for many more years!