On 5/26/1976, a category F3 (max. wind speeds 158-206 mph) tornado 4.9 miles away from the city center injured one person and caused between $500,000 and $5,000,000 in damages. Richardson-area historical earthquake activity is slightly below Texas state average.6.5%. According to our research of Texas and other state lists there were 26 registered sex offenders living in Richardson, Texas as of October 14, 2015.
Bronzite is a variety of enstatite that is also associated with hypersthene, which contains silica, magnesium, oxygen, and iron; this is similar to the structure of the serpentine group of minerals. (Bronzite has more iron than enstatite and more magnesium (and less iron) than hypersthenes).
apatite. noun. 1  Any of a group of natural, variously colored calcium phosphate minerals containing fluorine, chlorine, or hydroxyl. 2  These compounds form hexagonal crystals and are components of bones and teeth, are a source of phosphorus for plants, and are used in the manufacture of fertilizers.3  See fluorapatite.patite. noun. 1  Any of a group of natural, variously colored calcium phosphate minerals containing fluorine, chlorine, or hydroxyl. 2  These compounds form hexagonal crystals and are components of bones and teeth, are a source of phosphorus for plants, and are used in the manufacture of fertilizers. 3  See fluorapatite.