Pyrite (Fool's Gold)
Iron Disulfide (FeS2)
mineral
Category
Sedimentary Or Igneous Fragment
Browse sedimentary or igneous fragment specimens identified by the Rock Identifier community.
Gneiss (Metamorphic Rock)
Gneiss
metamorphic
Gneiss
Gneissic Metamorphic Rock
metamorphic
Pyrite
Iron Sulfide (FeS2)
mineral
Gneiss (specifically Granite Gneiss)
Gneiss (High-grade Regional Metamorphic Rock)
metamorphic
Milky Quartz
Quartz (Silicon Dioxide, SiO2)
mineral
Hematite
Iron(III) oxide (Fe2O3)
mineral
Specular Hematite
Hematite (Fe2O3)
mineral
Carnelian Agate
Carnelian (Silicon Dioxide - SiO2)
mineral
Clear Quartz Crystal Cluster
Silicon Dioxide (SiO2)
mineral
Biotite (Black Mica)
Biotite - K(Mg,Fe)3AlSi3O10(F,OH)2
mineral
Gneiss
High-grade metamorphic rock (Gneiss)
metamorphic
Calcite
Calcium Carbonate (CaCO3)
mineral
Gneiss
Gneiss (High-grade Metamorphic Rock)
metamorphic
Amethyst
Amethyst (Silicon Dioxide - SiO2 with iron impurities)
mineral
Quartz Pebble
Silicon Dioxide (SiO2)
sedimentary
Water and Silt (Sedimentary Environment)
Suspended Sediment / H2O (dihydrogen monoxide)
sedimentary
Basalt River Stone
Basalt
igneous
Granitoid Gneiss with Feldspar Vein
Gneiss (High-grade Metamorphic Rock) with Potassium Feldspar (KAlSi3O8)
metamorphic
Quartz (Milky Quartz)
Silicon Dioxide (SiO2)
mineral
Banded Agate (specifically Sardonyx or Carnelian Agate)
Silicon Dioxide (SiO2) - Chalcedony variety
mineral
Quartz Geode
Silicon Dioxide (SiO2)
mineral
Pyrite (on a metal substrate)
Iron Sulfide (FeS2)
mineral
Milky or Iron-Stained Quartz
Quartz (Silicon Dioxide, SiO2)
mineral
Quartz Geode
Quartz (Silicon Dioxide, SiO2)
Mineral
Almandine Garnet
Almandine (Fe3Al2(SiO4)3)
mineral
Milky Quartz
Quartz (Silicon Dioxide, SiO2)
mineral
Green Calcite
Calcium Carbonate (CaCO3)
mineral
Gneiss (Metamorphic Rock)
Gneiss (high-grade regional metamorphic rock)
metamorphic
Almandine Garnet
Almandite (Fe3Al2(SiO4)3)
Mineral
Pyrite
Iron Sulfide (FeS2)
mineral
Banded Gneiss with Quartz Vein
Foliated Metamorphic Rock (Gneiss)
metamorphic
Agate (specifically a Blue Agate Geode Slice)
Chalcedony (cryptocrystalline variety of Quartz); SiO2
mineral
Clear Quartz
Quartz (Silicon Dioxide, SiO2)
mineral
Milky Quartz
Quartz (Silicon Dioxide, SiO2)
mineral
Pyrite
Iron Sulfide (FeS2)
mineral
Gneiss
Gneissic Metamorphic Rock
metamorphic
Rough Quartz (or Quartzite pebble)
Silicon Dioxide (SiO2)
mineral
Gneiss (Metamorphic Cobble)
Gneiss (High-grade Regional Metamorphic Rock)
metamorphic
Greenschist
Greenschist facies rock (containing chlorite, actinolite, albite, and epidote)
metamorphic
Quartz Geode
Silicon Dioxide (SiO2)
mineral
Hematite (Iron Ore)
Hematite (Fe2O3)
mineral