Large nano size to 75 micrometer (large nano to 0.075 mm). 999 Fine pure silver micron size 200 mesh and smaller. 50 grams total in 20 ml glass vile. If you watch the video towards the end when we are tapping the spoon you can see the very fine silver particles fall back into the silver dust bowl as they blow in the breeze. About the size of the silver above. The bigger chunks pictured above break up very easily. When I shake the batch of silver above in the open sunlight in front of a window I can easily see a silver dust cloud float up in the air. This tells me the silver is at least micron size or 10^(negative 6th). Please be sure to leave me positive 5 STAR feedback if you are happy with your item.