Some horses, especially older horses that are very relaxed, let their lower lip droop markedly. This is usually a normal finding. When these horses become more stimulated, the appearance changes. The key to this is that the appearance is symmetrical on left and right sides.
Because of corundum's hardness (pure corundum is defined to have 9.0 Mohs), it can scratch almost every other mineral. It is commonly used as an abrasive on everything from sandpaper to large machines used in machining metals, plastics, and wood.orundum from Brazil, size about 2 cm Ã 3 cm (0.8 in Ã 1 in). Corundum occurs as a mineral in mica schist, gneiss, and some marbles in metamorphic terranes. It also occurs in low silica igneous syenite and nepheline syenite intrusives.
Different Uses for Rubies. Jewelry is just one of the uses for rubies. ruby necklace image by OMKAR A.V from Fotolia.com. Rubies are rare gems that are a form of corundum. People associate rubies with the color red, but depending on their exact elemental content, rubies may appear pink, as well. Gemstone Education reports that rubies of high purity have exceptionally high value due to their rarity--in some cases, they can fetch prices higher than diamonds.