Granite is a felsic or acidic rock. A vesicle is a cavity formed by expanding gas during the cooling of an extrusive igneous rock. A good example of vesicles are those found in pumice. If a vesicle is filled in by a secondary mineral it is described as an amygdale.
InformAfrica â Kisii County is a district in the Nyanza Province of southwestern Kenya, and is mostly inhabited by the Gusii tribe or Kisii people. Kisii is the capital town of Kisii county. As of 2010, Kisii county has 7 constituencies which are: Bobasi, Bonchari, Bomachoge, Kitutu Chache, Nyaribari Chache, Nyaribari Masaba, and South Mugirango.
The neighboring regions are Mwanza Region and Simiyu Region (to the south), Arusha Region (to the southeast), and Kagera Region (across Lake Victoria). To the northeast, the Mara Region borders Narok County and Migori County in Kenya. The Mara Region is the home of Tanzania's first president, Julius Nyerere. The Mara Region was also the birthplace of Benga music.