Cleavage occurs when a mineral breaks along planes of weakness. These weaknesses are a part of the mineral's crystalline structure. Cleavage may occur in one, two, three or all directions. More » Science Earth Science Geology

Diamond cleavage is a straight-lined crack in a cut diamond. Diamond cleavage is one of many inclusions, or flaws, that reduce the value of a diamond. Diamond cleavage reduces the value of diamonds not only because it is... More »

Tungsten in its pure elemental form has neither cleavage nor fracture, since both are physical properties characteristic of minerals, which are compounds of more than one element. The element tungsten is extracted from t... More »

According to Brooklyn College, cleavage occurs when a rock breaks along smooth planes that are parallel to areas in which the mineral has weak bonds. By contrast, rocks are said to fracture if they break irregularly, bec... More »

Several methods exist to identify minerals, including the streak test, the Mohs hardness scale, the fracture test and the acid test. Based on these tests and the mineral's physical appearance, scientists can identify wha... More » Science Earth Science Geology

Some important characteristics of minerals are color, hardness, streak, cleavage, fracture and luster. These characteristics do not require any complicated equipment to determine and are useful in identifying specific mi... More »

Quartz is a mineral, while granite is a rock made up of minerals. Only one of those minerals is quartz. Pure quartz is silicon dioxide and is hard and transparent, but impurities can give it a range of colors. More » Science Earth Science Geology