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Gravel /ËÉ¡raevÉl/ ËÉ¡rÃ¦vÉl is composed of unconsolidated rock fragments that have a general particle size range and include size classes from-granule to-boulder sized. Fragments gravel is categorized by The-Udden wentworth scale into granular (gravel 2 to 4 mm or.0 079 to.0 157) in and pebble (gravel 4 to 64 mm or.0 2 to.2 5). in Pay gravel: also known as pay dirt; a nickname for gravel with a high concentration of gold and other precious metals. 2  The metals are recovered through gold panning.
Granite is a common and widely occurring type of intrusive, felsic, igneous rock. Granite has a medium to coarse texture, occasionally with some individual crystals larger tha â¦ n the groundmass forming a rock known as porphyry.Granites can be pink to dark gray or even black, depending on their chemistry and mineralogy. Outcrops of granite tend to form tors, and rounded massifs.ranite is hard to scratch with a fingernail.   2. Basalt is formed from lava that cooled rapidly, so it has a fine-grained texture. Its mineral grains are so tiny that they can be seen only through a microscope. It may be black or dark green. It contains the minerals feldspar and olivine.