Calories in beer are from alcohol. One average 12-ounce 355 ml beer has about 150 calories and 13 grams of carbohydrates.
Common rock-forming minerals. These are specimens of minerals from the University of Auckland's collection. Along with the common rock-forming minerals, we have included apatite, corundum, diamond, fluorite, topaz and talc to illustrate minerals used in Moh's Scale of Hardness.Click on either a thumbnail, or the name in the list at the side, for details and larger photographs of each mineral.hese are specimens of minerals from the University of Auckland's collection. Along with the common rock-forming minerals, we have included apatite, corundum, diamond, fluorite, topaz and talc to illustrate minerals used in Moh's Scale of Hardness.
Silicatesâincluding quartz, mica, olivine, and precious minerals such as emeraldsâare the most common class of minerals, as well as the major components of most rocks. Oxides, sulfides, sulfates, carbonates, and halides are other major mineral classes.Gemstones. Many minerals form beautiful crystals, but the most prized of all are gemstones. Uncut gems are often fairly ordinary looking.It's only when they are cut and polished that they obtain the brilliance and luster that makes them so valued.Historically gems have been divided into precious and semiprecious classes.inerals and gems are classified by their physical properties, including hardness, luster, color, density, and magnetism. They're also identified by the ways in which they break, or the type of mark, or streak, that they leave when rubbed on a laboratory tool called a streak plate. More Â».