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.
1 A water molecule has two pairs of bonded electrons and two unshared lone pairs. 2  Tetrahedral: Tetra-signifies four, and-hedral relates to a face of a solid, so  tetrahedral  literally means having four faces. 3  This shape is found when there are four bonds all on one central atom, with no extra unshared electron pairs.