|Monthly Tech-Tip |
These are 40 mesh particles, about 400 microns in size. They are clearly visible as rounded, not angular. The carbon and high iron mineral particles are easy to spot. The rest appear to be quartz (having various levels of purity from amber to crystal clear). The interesting thing about these is where they come from: A very dirty-looking terra cotta clay. Something else interesting: At 50, 80 and 100 mesh the iPhone, even with its computational photography, was also able to capture the particles - and they looked exactly the same. Their presence explained a number of physical properties of the clay that otherwise seemed odd.
Particle Size Distribution
Knowing the distribution of particle sizes in a ceramic material is often very important in assessing its function and suitability for an application.
Quartz is the most abundant mineral on earth, it is the main crystalline mineral form of silica (SiO