Is dust from cutting meteorites dangerous?
It can be. Cutting and grinding create fine dust that may contain silica, nickel and other substances, so it should be done with water, ventilation and a suitable mask.
Meteorites themselves are safe to handle, but cutting, grinding and polishing them produces fine dust, which needs care.
What is in the dust. Stony meteorite dust contains silicate minerals, metal and sulfide particles. Some meteorites contain small amounts of free silica, such as tridymite or cristobalite, which can harm the lungs if inhaled over long periods. Metal dust contains nickel and cobalt, which can irritate skin and lungs and can cause allergies in some people. Iron meteorite cutting produces metal particles and fine swarf.
Health risks. Inhaling fine mineral or metal dust regularly can damage the lungs. Short occasional exposure is less harmful, but it is best avoided. Some people develop nickel allergies from skin contact.
Safe practice. - Wet cutting. Use saws and grinders with water or a coolant to keep dust down. For meteorites that rust or react with water, specialists may use oil or other fluids. - Ventilation. Work in a well-ventilated area, ideally with dust extraction. - Protection. Wear a well-fitting dust mask rated for fine particles, safety glasses and gloves. - Clean-up. Clean surfaces with damp cloths rather than sweeping dry dust. Wash hands and clothes afterwards. - Children. Children should not cut or grind meteorites or rocks.
Professional preparation. Many collectors prefer to have specimens cut by experienced preparers, who have proper equipment and can minimise waste of precious material.
For most people, enjoying meteorites does not involve cutting them at all, and handling finished specimens carries no significant risk.