A: Fiction. Antibiotics used in animals are the cause of major human drug resistant diseases. Myth: âAnimal antibiotics kill more people than breast and prostate cancerâ screamed a blogger in the wake of an AP story on antibiotics used to keep food animals healthy.
Mineral Luster. Luster is a description of the way a mineral surface looks when light reflects off of the surface. Luster has two categories, metallic and nonmetallic.
Relief is a useful distinguishing property for the the igneous rock-froming minerals; all the mafic minerals show high relief but all the felsic minerals (with the exception of muscovite) show low relief.he instrument we use to look at thin sections is a polarising microscope. These are expensive (1500!) items and also need to be treated with care, especially the lenses. Before using a polarising microscope it is important to know a bit about polarised light and the optical properties of minerals.