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).
Magnetite is a mineral, one of the three common naturally occurring iron oxides (chemical formula Fe3O4) and a member of the spinel group. Magnetite is the most magnetic of all the naturally occurring minerals on Earth.Naturally magnetized pieces of magnetite, called lodestone, will attract small pieces of iron, and this was how ancient people first noticed the property of magnetism.mall grains of magnetite occur in almost all igneous and metamorphic rocks. Magnetite is black or brownish-black with a metallic luster, has a Mohs hardness of 5â6 and a black streak. The chemical IUPAC name is iron(II,III) oxide and the common chemical name is ferrous-ferric oxide.