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.
2) STREAK. This is the colour of the line drawn when a mineral is rubbed across a piece of unglazed tile. Often the line is the same or similar colour of the specimen.This test is useful because in a few cases, similar looking minerals have different streaks - so this test is a definitive identifier. Luster is what the surface looks like when the light reflects off of the mineral. Some words to describe luster are: 1  DULL / EARTHY - very dull, mainly minerals that are porous eg kaolinite, orthoclase.  WAXY - like the surface of a candle, like wax paper eg opal, chalcedony.