Nitrofurantoin (Macrodantin, Furadantin, Macrobid) is a drug available in three forms prescribed for the treatment or prevention of urinary tract infections (UTIs). Side effects, warnings and precautions, drug interactions, and patient information should be reviewed prior to taking any medication.
In this group the mineral is held together by the attraction between silica tetrahedra and other positive ions. Olivine and Garnet are examples of minerals within the independent tetrahedra group. Single chain silicates contain silica tetrahedra that are linked up in a chain by sharing two oxygen atoms. The most common single chain silicate is pyroxene. Double chain silicates form by sharing either two or three oxygen.
Silicates. The fundamental structural unit is the silicon and oxygen tetrahedron. The four oxygens sit on the corners of the tetrahedon and the silicon sits at the center. These tetrahedra can be arranged in various ways by sharing one or more oxygens between adjacent tetrahedra. There are some 3,500 recognized minerals found on Earth. For our purpose, we can focus on about a dozen.