Home » Minerals » Marcasite


Mineral Properties and Uses

What is Marcasite?

Marcasite is an iron sulfide mineral. It has the same chemical composition as pyrite, however these two minerals are in different crystal systems (marcasite is orthorhombic and pyrite is isometric).

Physical Properties of Marcasite

Chemical Classification sulfide
Color pale bronze yellow
Streak grayish black
Luster metallic
Diaphaneity opaque
Cleavage poor
Mohs Hardness 6 to 7.5
Specific Gravity 4.9
Diagnostic Properties color
Chemical Composition iron sulfide, FeS2
Crystal System orthorhombic

Uses of Marcasite?

Very few commercial uses. Has been used as a source of sulfur and as an ornamental stone (many of the ornamental stones sold under the name of "marcasite" are actually pyrite).

Find it on Geology.com

More from Geology.com

gem photos
100+ Gems - Photos of over 100 beautiful gems ranging from the popular to the obscure.
Difficult Rocks
Difficult Rocks - Elementary students find lots of rocks that you will not be able to identify.
Diamonds from Coal
Biggest Misconception: Lots of people think that diamonds form from coal. Not True!
strontium titanate
Strontium Titanate is a man- made diamond simulant with a fire much stronger than diamond.
Malachite has served as a gem material, pigment and ore of copper for thousands of years.
Geology of Pluto
Geology of Pluto: NASA finds craters, nitrogen ice flows, mountains, and possible dunes.
Mineraloids are amorphous naturally-occurring inorganic solids that lack crystallinity.
Titan Submarine
Exploring a Hydrocarbon Sea on Titan with a submarine is a potential NASA mission.

More Minerals
  Mohs Hardness Scale
  Rock, Mineral and Fossil Collections.
  Geology Tools
  Mineral Identification Chart

© 2005-2016 Geology.com. All Rights Reserved.
Images, code, and content on this website are property of Geology.com and are protected by copyright law.
Geology.com does not grant permission for any use, republication, or redistribution.
Images, code and content owned by others are marked on the pages where they appear.