mineral
Marcasite Sun
Marcasite (FeS2)
AI-generated identification · may be incorrectHardness of 6-6.5 on Mohs scale, metallic luster, brass-yellow to bronze color, and radiating crystal structure.
Identified More mineral →
Explore Marcasite Sun in the encyclopedia →Identify your own rocks.
Get a report just like this from any photo, free.
Physical properties
Hardness of 6-6.5 on Mohs scale, metallic luster, brass-yellow to bronze color, and radiating crystal structure.
Formation & geological history
Formed in sedimentary shale environments, particularly coal beds, through low-temperature precipitation from acidic solutions during the Paleozoic era.
Uses & applications
Primarily collected as a unique ornamental mineral specimen for display by mineral enthusiasts.
Geological facts
Also known as pyrite suns or pyrite discos, these flattened radial aggregates form along bedding planes in Illinois coal mines.
Field identification & locations
Easily identified by its distinctive disc shape and radiating surface blades, frequently sourced from the Sparta region in Illinois.
More like this
Other mineral specimens
Gneiss or Schist
Gneiss or Mica Schist with Garnet
Metamorphic
Limonite
FeO(OH)•nH2O
mineral
Sandstone (with potential mineral staining/concretions)
Arenite (SiO2 based)
sedimentary
Tumbled granite
Granite, a coarse-grained felsic intrusive igneous rock
igneous
Feldspar
Feldspar Group (Tectosilicate, e.g., KAlSi3O8)
mineral
Pegmatite with Tourmaline and Quartz
Igneous Pegmatite
igneous