For U.S. Treasuries traded with a Fidelity representative, $19.95 per trade. Fixed income trading requires a Fidelity brokerage account with a minimum opening balance of $2,500. Rates are for U.S. Dollar denominated bonds, additional fees and minimums apply for non-Dollar bond trades.
A group of minerals containing various amounts of the elements Silicon and Oxygen. The Silicates are the largest group of minerals. The construction component of all Silicates is the tetrahedron, which is one Silicon atom equidimensionally placed around four Oxygen atoms.
Non-Silicate Minerals. Minerals can be classified as either silicate - that is, containing silicon and oxygen - or non-silicate - that is, lacking silicon. While most of the earth's crust is composed of silicate minerals, several non-silicate minerals are of great importance.