SPI Supplies Brand Agate Mortar and Pestle Set 80mm x 65mm
The mineral agate used for the SPI Supplies mortar and pestle sets is 99 9% SiO 2 in other words quartz It exhibits a Mohs Scratch Hardness of 7 and this is what makes agate the ideal choice for tools for grinding or crushing even for the hardest of materials Unlike porcelain which is porous the high quality agate used by SPI Supplies is high density without porosity which