Lodestone is a magnetic mineral that is found in igneous and metamorphic rocks. It is a type of magnetite, which are minerals that possess a strong attraction to magnets. More »

Although there is not a specific rock that is magnetic, certain magnetic properties of a rock may be found in the crystals and minerals that make up a rock. The magnetic mineral magnetite is commonly found in igneous roc... More »

Scientists have hypothesized and made predictions about the cause of the Earth's magnetic fields, and the prevailing theory is that the Earth's magnetism originates from the planet's center, or core. Because scientists d... More »

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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 »

Talc is a common mineral which is widely known for its use in talcum powders, for its softness, and for creating pseudomorphs of other minerals in rock formations. It is not considered a gemstone and is often used for in... More »

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Strong parallel alignment of different mineral bands in a rock is called foliation. Foliation occurs in metamorphic rocks. The high pressure under which metamorphic rocks are formed creates this banding. More »

www.reference.com Science Earth Science Geology

The main difference between granite and quartz is that granite is a rock and quartz is a mineral. In geology, rocks are materials that are composed of many different minerals. Minerals, however, are composed of a definit... More »