Identifying Rocks and Minerals/Types of Rocks - Wikibooks ...
There are three different types of rocks: Igneous, Sedimentary, and Metamorphic. The difference between each type is in how they are formed. Igneous rocks . Igneous rocks have many distinct characteristics. For example, light-colored igneous rocks are more acidic, and have over 65% silica.
Grinding and honing. Part 2 - XS4ALL
In principle there are only three types of stone suitable to use as grinding stone, honing stone or polisher stone, provided the composition is right. * Sand stone * Shale * Novaculite All the whetstones consist of a very large part of quartz. Quartz is a form of silicon dioxide, SiO2 and is among the ... Granite is the best-known species ...