NOTE... for each mineral you powder, make sure the iron plate is not contaminated with your previously-made powder!
QUARTZ goes flying! ALWAYS BUST IT UP UNDER A CLOTH! OBSIDIAN IS VERY DANGEROUS and should not be used in powdered form. MICRO GLASS SHARDS CAN KILL!
QUARTZ INCLUDES... smokey, rutilated, milky, clear varieties, citrine, amethyst, carnelian, agate and more ... All Silicon Dioxide. The colors vary due to minute amounts, very minute amounts of trace elements, or air bubbles, or small inclusions of other minerals. . Some crystal healers believe that color is important, some don't. I lean towards the DON'T camp. Your choice.
Keep your powders in lead free small glass bottles with screw on plastic covers. Keep in a dry environment before use. .