The U.S. Department of Agriculture (USDA) regulates whether cuts of beef can be labeled as lean or extra lean based on their fat and cholesterol content. Lean cuts of beef The USDA defines a lean cut of beef as a 3.5-ounce serving (about 100 grams) that contains less than:
â¢ High-Calcium Limestone: â¢ Magnesian Limestone: Lastly, some dolomites contain an excess of magnesium (Mg) and are called magnesian dolomite or high-magnesium dolomite. The excess magnesium is probably in the form of magnesium carbonate minerals, of which magnesite (MgCO3) is a possible candidate. It is used as a soil conditioner to neutralize acidity and to add calcium and magnesium nutrients. 2  Quicklime is calcium oxide (formula CaO) that is produced by calcining (burning) high-calcium limestone in a lime kiln to drive out the carbon in the form of carbon dioxide gas (formula CO2).
Limestone is common a rock that makes up about ten percent of all sedimentary rocks. Limestone is made up of calcite aragonite. A lot of limestone comes from skeletal fragments of marine organisms. Throughout history, many people have recognized limestoneâs potential and used it for a building material.The great pyramids of Egypt, among many other landmarks, are constructed of limestone.o make Portland cementâthe most common type of cementâpowdered limestone is heated in a rotary kiln. As a source of calcium, it joins with powdered clay to produce a product called clinker, which is then ground with a source of sulfate, like gypsum.