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 »

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 »

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 » Science Physics

Magnesium sulfate crystals can be prepared from Epsom salt available in pharmacies. Natural magnesium sulfate exists as the mineral kieserite, MgSO4?H2O, which is purified by crystallization. More » Science Chemistry

When attempting to grow crystals, start by making a crystal solution that is as saturated as possible. This will minimize the amount of time necessary for the crystals to form, and maximize their potential for growth. If... More » Science Chemistry

The compound with the chemical formula CuSO4 x 5H2O is called copper (II) sulfate pentahydrate, and it appears in the form of blue crystals, granules or powder. Also referred to as blue vitriol, copper sulfate pentahydra... More »

Survivalists and outdoorsmen add iodine crystals to water, because iodine chemically purifies and disinfects untreated water. These crystals are used as a temporary measure, as iodine can be toxic in large quantities, es... More »