5" Realistic, Polished "Yellow Turquoise" Jasper Skull - Magnetic

"Yellow turquoise" is a trade name for this unique type of jasper, which ranges in color from yellow to lime, with natural inclusions of dark gray magnetite. This trade name is rather deceptive, since the stone is not only not turquoise (the mineral) but is also not turquoise (the color). Nevertheless, it is a very interesting and attractive stone, particularly when polished.

About Magnetite

Magnetite is a naturally occurring iron oxide mineral with the chemical formula Fe₃O₄. It is one of the most magnetic minerals found on Earth, a property that has made it historically significant in the development of early navigation tools like the compass. Magnetite typically forms in igneous and metamorphic rocks, and its crystals often appear as octahedrons or granular masses with a metallic luster and a deep black to dark gray color.

The mineral is composed of both ferrous (Fe²⁺) and ferric (Fe³⁺) iron, giving it its strong magnetic characteristics and distinguishing it from other iron oxides such as hematite. It has a Mohs hardness of 5.5–6.5 and a high specific gravity, making it quite dense. Magnetite is an important iron ore and is widely mined for use in steel production.

Besides its industrial value, magnetite is also of interest to collectors due to its striking appearance and magnetic properties. Large or well-formed octahedral crystals are particularly sought after.