Because granite is very hard, it often used to make buildings, kitchen countertops, tombstones, and sculptures.TES XXVI, 3 fall 2010 The Fall 2010 issue of The Earth Scientist, focuses on rocks and minerals, including articles on minerals and mining, the use of minerals in society, and rare earth minerals, and includes 3 posters!
Granite is a common and widely-occurring group of intrusive felsic igneous rocks that forms at great depths and pressures under continents.
Granite consists of orthoclase, plagioclase quartz, hornblende, biotite, muscovite and minor accessories such as magnetite, garnet, zircon and apatite minerals. Ordinary granite always carries a small amount of plagioclase, but when this is absent the rock is referred to as alkali granite.
But two observations and two clues omitted from physics textbook discussions of radiodating show that these radioisotope “clocks” are broken.
First, scientists have observed that radioactive isotope (radioisotope) decay rates do fluctuate, including Th-228, Rn-22, and Si-32.
Granite is composed mainly of quartz and feldspar with minor amounts of mica, amphiboles, and other minerals.
This mineral composition usually gives granite a red, pink, gray, or white color with dark mineral grains visible throughout the rock. Many people recognize granite because it is the most common igneous rock found at Earth's surface and because granite is used to make many objects that we encounter in daily life.
An increasing proportion of plagioclase feldspar causes granite to pass into granodiorite.
A rock consisting of equal proportions of orthoclase and plagioclase plus quartz may be considered a quartz monozonite.
It is similar to assuming that the constriction in an hourglass has always been the same diameter, and the same number of sand grains passes every minute.