Marcasite can be formed as both a primary or a secondary mineral. It typically forms under low-temperature, highly acidic conditions. It occurs in sedimentary rocks (shales, limestones and low …

Marcasite is a yellow to silvery-yellow iron sulfide mineral with a chemical composition of FeS 2. It forms by precipitation from acidic waters in surface or near-surface environments. Marcasite is commonly …

The mercury ore at Idria does contain metallic golden specks of what is now called marcasite, but it also has metallic golden pyrite. Johnathan Hill used the name marcasite in 1771, but his usage was also …

Marcasite is a brassy yellow gemstone similar to pyrite. It’s prevalent in vintage jewelry, but requires some caution to maintain. Learn marcasite’s history, properties, prices, and benefits!

Marcasite is the most prevalent mineral to experience a condition known as pyrite decay, in which a specimen will slowly disintegrate into a white powder. Little is known about this detrimental condition. …

Unlike Pyrite, Marcasite does not exhibit a cubic identity, instead, it crystallizes in a variety of other forms, such as tabular, pyramidal, nodules, fibers, flakes, and masses.

Jul 3, 2025 · Chances are, it could be marcasite —a mineral that’s often mistaken for pyrite (fool’s gold) but has its own unique charm. Whether you’re a gem enthusiast, a jewelry lover, or just curious …

May 19, 2023 · Marcasite is iron disulfide FeS 2 and often contains small amounts of Sb and As. It is chemically identical with cubic pyrite, but it is typical for low temperature environments up to surface …

Dec 20, 2022 · Marcasite is a type of gemstone that has been used in jewelry for centuries. Marcasite jewelry refers to the gemstone but it also means a type of jewelry – setting tiny pieces of pyrite in …

Arabic or Moorish name for pyrites and similar material of uncertain origin. Comments: Metallic, brassy-colored marcasite with minor translucent quartz and white dolomite. Location: Panasqueira (3rd …