Hematite
Iron(III) oxide (Fe2O3)
mineral
Category
Mixed: Igneous And Sedimentary
Browse mixed: igneous and sedimentary specimens identified by the Rock Identifier community.
Quartz (Grain/Fragment)
Silicon Dioxide (SiO2)
mineral
Muscovite Mica
Muscovite (KAl2(AlSi3O10)(OH)2)
mineral
Pyrite (Fool's Gold)
Iron Sulfide (FeS2)
mineral
Quartz (Milky/Smoky variety)
Silicon Dioxide (SiO2)
mineral
Magnetite (likely with weathered Limonite/Hematite)
Magnetite (Fe3O4) with iron oxide weathering
mineral
Gneiss (Cobble)
Gneiss
metamorphic
Pyrite (on Quartz matrix)
Iron Sulfide (FeS2)
mineral
Blue Chalcedony
Silicon Dioxide (SiO2)
mineral
Gneiss
Gneiss (High-grade metamorphic rock)
metamorphic
Quartz (Milky/Common)
Quartz (Silicon Dioxide, SiO2)
mineral
Gneiss (specifically Banded Gneiss)
Gneiss
metamorphic
Pyrite
Iron Sulfide (FeS2)
mineral
Quartz Geode
Silicon dioxide (SiO2)
mineral
Quartz (specifically Milky or Clear Quartz)
Silicon Dioxide (SiO2)
mineral
Pyrite
Iron Sulfide (FeS2)
mineral
Pyrite
Iron Sulfide (FeS2)
mineral
Clear/White Quartz (Rock Crystal)
Silicon Dioxide (SiO2)
mineral
Chalcedony (Agate)
Silicon Dioxide (SiO2)
mineral
Mica-rich Schist fragment
Mica Schist
metamorphic
Clear Quartz (Rock Crystal)
Silicon Dioxide (SiO2)
mineral
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Pyrite (on Quartz matrix)
Iron Sulfide (FeS2)
mineral
Banded Gneiss
Gneiss (Metamorphic high-grade, predominantly SiO2, Al2O3, K2O, Na2O)
metamorphic
Quartz (Smoky/Milky variety)
Silicon Dioxide (SiO2)
mineral
Gneiss (specifically Micaceous Gneiss)
Gneiss (High-grade Regional Metamorphic Rock)
metamorphic
Quartz (Milky or Druzy Quartz)
Silicon Dioxide (SiO2)
mineral
Cryptocrystalline Quartz (Agate/Chert)
Silicon dioxide (SiO2)
sedimentary
Dyed Pink Agate Slice
Cryptocrystalline variety of Quartz (SiO2)
mineral
Quartz (Milky Quartz)
Silicon Dioxide (SiO₂)
mineral
Botryoidal Chalcedony (Agate/Desert Rose Chalcedony)
Silicon Dioxide (SiO2) - Cryptocrystalline Quartz
mineral
Greenschist
Chlorite schist
metamorphic
Quartz (Milky Quartz)
Silicon Dioxide (SiO2)
mineral
Rough Quartz
Quartz (Silicon Dioxide, SiO2)
mineral
Clear Quartz
Silicon Dioxide (SiO2)
mineral
Quartz with Mica inclusions (likely Schist or Gneiss host)
Silicon Dioxide (SiO2) with Phyllosilicates (KAl2(AlSi3O10)(OH)2)
metamorphic
Gneiss (with Quartzite and Biotite)
Gneiss containing SiO2 (Quartz), K(Mg,Fe)3AlSi3O10(OH)2 (Biotite), and (K,Na,Ca)AlSi3O8 (Feldspar)
metamorphic
Quartz (Milky Quartz)
Silicon Dioxide (SiO2)
mineral
Clear Quartz (Rock Crystal)
Silicon Dioxide (SiO2)
mineral
Hematite
Iron(III) oxide (Fe2O3)
mineral
Gneiss
Gneiss (High-grade regional metamorphic rock)
metamorphic
Carnelian
Carnelian (a variety of Chalcedony, SiO2)
mineral