Web Results

en.wikipedia.org/wiki/Magnetite

Magnetite is a rock mineral and one of the main iron ores, with the chemical formula Fe 3 O 4.It is one of the oxides of iron, and is ferrimagnetic; it is attracted to a magnet and can be magnetized to become a permanent magnet itself. It is the most magnetic of all the naturally-occurring minerals on Earth. Naturally-magnetized pieces of magnetite, called lodestone, will attract small pieces ...

www.thoughtco.com/black-minerals-examples-1440937

Pure black minerals are less common than other types of minerals, and they can be difficult to recognize. But by carefully observing such things as grain, color, and texture, you can easily identify many black minerals.This list will help you identify the most significant of them, along with notable geological characteristics, including luster and hardness as measured on the Mohs Scale.

treasurepursuits.com/shiny-black-rock

Different Types of Shiny Black Rock. Black rocks can be easily found in various places, including mountains and coastlines. However, a shiny black rock may not be that common. These types of rocks could be valuable gemstones or minerals that could be used for jewelries or they could also be made into a collection.

geology.com/meteorites/meteorite-identification.shtml

The surface of our planet is rich in terrestrial iron oxides such as magnetite and hematite (many of which will stick to a magnet), dark black rocks such as basalt, and many different types of man-made metallic by-products such as runoff (slag) from old smelters, and castoff iron implements that have corroded over time.

www.reference.com/science/type-rock-magnetic-e48c7bf955eea6a7

What Type of Rock Is Magnetic? 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 rocks.

en.wikipedia.org/wiki/List_of_rocks

The following is a list of rock types recognized by geologists. There is no agreed number of specific types of rocks. Any unique combination of chemical composition, mineralogy, grain size, texture, or other distinguishing characteristics can describe rock types. Additionally, different classification systems exist for each major type of rock.

www.meteorite.com/meteorite-information/meteorite-identification

So ‘Black or Brown on the Outside’ is the feature we are now discussing but it maybe the first thing to look for in the rocks. If your rock had some of the characteristics but not all it is still possible that it is a type of stone meteorite.

gem5.com/tag/black

The 3 types Andradite are..1.)Demantoid, 2.)Melanite, and 3.) ... It appears as coarse, dark gold-brown prisms, or sometimes reddish-brown to black stubby crystals. On weathered rock, it stands out in contrast like sand-coated yellowish brown prisms. Surfaces are often rough or covered with an earthy coating because of natural alteration.

www.galleries.com/minerals/property/magnetis.htm

The Magnetic Minerals are few, but the property is important because of this fact. Once a specimen is established as magnetic, identification becomes a rather routine exercise. The mineral magnetite is named after this characteristic.. Magnetism occurs (most often) when there is an imbalance in the structural arrangement of the iron ions.

geology.com/minerals/magnetite.shtml

Magnetite is very easy to identify. It is one of just a few minerals that are attracted to a common magnet. It is a black, opaque, submetallic to metallic mineral with a Mohs hardness between 5 and 6.5. It is often found in the form of isometric crystals. It is the most strongly magnetic mineral ...