Pyrite
Iron Disulfide (FeS2)
mineral
Category
Mixed: Igneous And Sedimentary
Browse mixed: igneous and sedimentary specimens identified by the Rock Identifier community.
Schist
Mica Schist
metamorphic
Quartz (specifically Milky/White Quartz)
Silicon Dioxide (SiO2)
mineral
Graphite
Graphite (Chemical Formula: C)
Mineral (Native Element)
Banded Gneiss
Gneiss (High-grade Metamorphic Rock)
metamorphic
Feldspar
KAlSi3O8 - NaAlSi3O8 - CaAl2Si2O8
mineral
Gneiss
Gneiss
metamorphic
Clear Quartz Crystal
Quartz (Silicon Dioxide, SiO2)
mineral
Yellow Calcite
Calcium Carbonate (CaCO3)
mineral
Fluorite
Fluorite (Calcium Fluoride, CaF2)
mineral
Pyrite
Iron Sulfide (FeS2)
mineral
Quartz (Milky/Rose variety)
Silicon Dioxide (SiO2)
mineral
Pyrite
Iron Sulfide (FeS2)
mineral
Milky Quartz
Quartz (Silicon Dioxide - SiO2)
mineral
Clear Quartz
Silicon Dioxide (SiO2)
mineral
Clear Quartz
Crystalline Silicon Dioxide (SiO2)
mineral
Quartz
Silicon Dioxide (SiO2)
mineral
Gneiss (with Mica and Quartz)
Gneissic Metamorphic Rock
metamorphic
Clear Quartz (Rock Crystal)
Silicon Dioxide (SiO2)
mineral
Hematite
Iron(III) oxide (Fe2O3)
mineral
Chalcedony (Agate/Blue Quartzite)
Silicon Dioxide (SiO2)
mineral
Pyrite
Iron Disulfide (FeS2)
mineral
Gneiss
Gneiss (High-grade Regional Metamorphic Rock)
metamorphic
Clear Quartz
Silicon Dioxide (SiO2)
mineral
Rough Precious Opal
Hydrated Silica (SiO2·nH2O)
mineral
Chalcedony (River Stone)
Microcrystalline Quartz (SiO2)
mineral
Gneiss (Metamorphic Rock)
Gneiss
metamorphic
Garnet-Bearing Gneiss
Almandine-Garnet Gneiss
metamorphic
Clear Quartz
Silicon Dioxide (SiO2)
mineral
Gneiss (specifically Amphibolite Gneiss)
Gneiss
metamorphic
Gneiss (specifically a weathered Amphibolite or Garnet Gneiss)
Gneiss (complex silicate composition)
metamorphic
Chalcedony
Cryptocrystalline Quartz (SiO2)
Mineral
River Stone (likely Siltstone or fine-grained Basalt)
Clastic Sedimentary (Siltstone) or Mafic Igneous (Basalt)
sedimentary or igneous
Magnetite / Iron Ore
Magnetite (Fe3O4)
mineral
Quartz / Limestone Gravel
SiO2 (Silicon Dioxide) and CaCO3 (Calcium Carbonate)
igneous and sedimentary mixture
Yellow Quartz
Silicon Dioxide (SiO2)
mineral
Blue Apatite
Apatite-(CaF), Ca5(PO4)3F (Calcium Fluorophosphate)
mineral
Green Moss Agate / Jasper
Silicon Dioxide (SiO2) - Microcrystalline Quartz with Iron and Manganese inclusions
sedimentary
Milky Quartz with Iron Inclusions
Silicon Dioxide (SiO2)
mineral
Grey Chalcedony (Tumbled Moon)
Microcrystalline Quartz (SiO2)
mineral
Blue Calcite
Calcium Carbonate (CaCO3)
mineral
Sandstone
Arenite (primarily SiO2)
sedimentary