Home » Minerals » Marcasite

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


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


Sliding Rocks
Sliding Rocks Mystery: What causes these rocks to slide across a Death Valley playa?
Gold Prospecting
Gold Prospecting in the US: The history, geography and geology of gold prospecting by USGS.
Pictographs
What Are Pictographs? They are drawings or paintings on rocks made by people.
Sea Level Rise Map
Sea Level Rise Map: A Google map that shows where flooding will occur as sea level rises.
Gems from Space
Gems from Space A number of materials from space have been used as attractive gems.
chrysoberyl
Chrysoberyl: an extreme gem. Its hardness is 8.5, can display chatoyance or color-change.
Unakite
Unakite: A gem material composed of green epidote and pink orthoclase.
Roadside Geology
Roadside Geology Guides - Explain the roadside geology of your favorite state.




More Minerals
  Fluorescent Minerals
  Minerals
  Mineral Identification Chart
  Mohs Hardness Scale
  Hardness Picks
  Hand Lens
  Diamond
  Quartz




© 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.