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).
People have used calciumâs compounds for thousands of years â in cement, for example. Limestone [calcium carbonate] was called calx by the Romans. The Romans heated calx, driving off carbon dioxide to leave calcium oxide.To make cement, all you have to do is mix calcium oxide with water.The Romans built vast amphitheaters and aqueducts using calcium oxide cement to bond stones together. (1). Despite the long history of calciumâs compounds, the element itself was not discovered until electricity was available for use in experiments.alcium is used to remove oxygen, sulfur and carbon from alloys. Calcium from limestone is a vital component of Portland cement. Quicklime (CaO) is used in many applications in the chemical industry, such as treatment of drinking water â especially for water softening and arsenic removal, animal waste and wastewater.