Specimen #848

Name: Dolomite with Marcasite

Type: Micromount

Locality: Beamsville, Clinton Township, Lincoln Co., Ontario, Canada

Favorite? N

Fluorescent? N



Acquired: 2008-10-29

Source: Ian Heales Collection

Label: N

Comment: Dolomite, which is named for the French mineralogist Deodat de Dolomieu, is a common sedimentary rock-forming mineral that can be found in massive beds several hundred feet thick. They are found all over the world and are quite common in sedimentary rock sequences. These rocks are called appropriately enough dolomite or dolomitic limestone. Disputes have arisen as to how these dolomite beds formed and the debate has been called the "Dolomite Problem". Dolomite at present time, does not form on the surface of the earth; yet massive layers of dolomite can be found in ancient rocks. That is quite a problem for sedimentologists who see sandstones, shales and limestones formed today almost before their eyes. Why no dolomite?

Minerals: Dolomite (CaMg(CO3)2) Marcasite (FeS2)

There is one picture on file


Dolomite on Marcasite, Magnification: 7.5X, FOV: 18.0 x 12.0 mm