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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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 »

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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 »

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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 »

The Encyclopedia of Arkansas explains that commercial mining of quartz is rare and occasionally consists of the use of explosives to first expose the quartz, followed by the operation of small hand tools such as chisels ... More »