Banded Iron Formation (BIF) / Jasper
Banded Iron Formation (primarily Quartz/SiO2 and Hematite/Fe2O3)
sedimentary
Category
Sedimentary (Microcrystalline Quartz)
Browse sedimentary (microcrystalline quartz) specimens identified by the Rock Identifier community.
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Green Aventurine
Aventurine Quartz (SiO2 with fuchsite inclusions)
Mineral
Red Jasper
Jasper (Silicon Dioxide based crypto-crystalline Quartz with Iron inclusions)
sedimentary
Red Jasper
Red Jasper (variety of Chalcedony, SiO₂)
Mineral
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Hematoid Quartz
Silicon Dioxide with Iron Oxide (SiO2 + Fe2O3)
mineral
Quartzite
Quartzite (SiO2)
metamorphic
Quartz Vein in Schist
Quartz (SiO2) in Pelitic Schist
metamorphic
Quartzite
Quartzite (primarily SiO2)
metamorphic
Sandstone
Arenite
Sedimentary
Chert (or possibly Flint)
SiO2 (Silicon Dioxide)
Sedimentary Rock
Hematite / Jasper
Iron(III) oxide (Fe2O3) in Quartz (SiO2)
mineral / sedimentary
Quartz with Schist Matrix
Crystalline Silicon Dioxide (SiO2) in micaceous schist
metamorphic
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Milky Quartz
Quartz (Silicon Dioxide, SiO2)
mineral
Quartz (Milky Quartz)
Silicon Dioxide (SiO2)
mineral
Banded Iron Formation (BIF)
Banded Iron Formation (predominantly Hematite, Magnetite, and Chert/Quartz)
sedimentary
Quartzite
Quartzite (composed primarily of SiO2)
metamorphic
Quartzite
Quartzite (SiO2)
metamorphic
Quartzite
Quartzite (composed primarily of SiO2)
metamorphic
Quartz River Cobble
Silicon Dioxide (SiO2)
Mineral (Primary constituent)
Amygdaloidal Basalt with Quartz Infill
Basalt (SiO2 for the quartz inclusion)
igneous
Ferruginous Quartz
Silicon Dioxide (SiO2) with Iron Oxide (Fe2O3) inclusions
mineral
Quartz
Silicon Dioxide (SiO2)
mineral
Red Jasper (beads)
Silicon Dioxide (SiO2) with iron inclusions
Sedimentary Rock
Ocean Jasper (Orbicular Jasper)
Silicon Dioxide (SiO2)
Sedimentary Rock
Banded Iron Formation
Banded Iron Formation (BIF)
Metamorphic Rock
Smoky Quartz and Biotite Schist
Quartz-Biotite Schist (SiO2 + K(Mg,Fe)3AlSi3O10(F,OH)2)
metamorphic
Quartzite
Quartzite (primarily SiO2)
metamorphic
Quartz (likely) / Siliceous rock with quartz phenocrysts (if a rock fragment)
Quartz (SiO₂)
Mineral
Banded Jasper (possibly "Picture Jasper")
Jasper (a microcrystalline variety of Quartz / Silicon Dioxide - SiO2)
Sedimentary rock (specifically a chemical sedimentary rock, or a chert if considered purely mineral aggregate)
Quartzite Pebble
Quartzite (SiO2)
metamorphic
Quartzite (River-worn Cobble)
Quartzite (composed primarily of SiO2)
metamorphic
Quartzite
Quartzite (SiO2)
metamorphic
Quartz
Quartz (Silicon Dioxide - SiO2)
Mineral
Sandstone with Quartz Vein
Arenite with Crystalline Silica (SiO2)
sedimentary
Quartzite Pebble
Quartzite (SiO2)
metamorphic
Yellow Quartz (Citrine Quartz variety / Ferruginous Quartz)
Silicon Dioxide (SiO2) with iron inclusions
mineral
Yellow Quartz River Pebble
Silicon Dioxide (SiO2)
mineral
Quartzite with Hematite staining
Quartzite (SiO2)
metamorphic
Shale or Argillite
Shale (sedimentary) / Argillite (metamorphic)
Sedimentary or Metamorphic (low-grade)
Quartzite
Quartzite (mostly SiO2)
metamorphic