Quartzite with Iron Inclusions
Quartzite (primarily SiO2 with Fe2O3 impurities)
metamorphic
Category
Sedimentary (Secondary Classification: Cryptocrystalline Quartz)
Browse sedimentary (secondary classification: cryptocrystalline quartz) specimens identified by the Rock Identifier community.
Learn about Sedimentary (Secondary Classification: Cryptocrystalline Quartz) in the encyclopedia
View all →
Geode (Unopened)
SiO2 (Silicon Dioxide) - Chalcedony/Quartz Geode
sedimentary
Jasper
Silicon Dioxide (SiO2) with iron and magnesium inclusions
sedimentary
Chert Nodule in Limestone
Chert (Microcrystalline Quartz, SiO2) and Limestone (Calcium Carbonate, CaCO3)
sedimentary
Agate
SiO2
Mineral
Red Jasper with Quartz Veins
Microcrystalline Quartz (SiO2) with Ferric Oxide (Fe2O3) inclusions
sedimentary
Basalt with Quartz Infill
Basalt (Mafic Extrusive Volcanic Rock)
igneous
Chalcedony
Chalcedony (SiO₂)
Mineral
Chert Nodules in Limestone
Cryptocrystalline Quartz (SiO2) within Calcium Carbonate (CaCO3)
sedimentary
Yellow Quartz
Silicon Dioxide (SiO2)
mineral
Chert (Flint)
Microcrystalline Silica (SiO2)
sedimentary
Quartz (Milky or Iron-Stained)
Silicon Dioxide (SiO2)
mineral
Quartz (Milky Quartz with Iron Staining)
Silicon Dioxide (SiO2)
mineral
Basalt River Pebble
Basalt (Aphanitic Mafic Volcanic Rock)
igneous
Chert (Quartz Variety)
Microcrystalline Silica (SiO2)
sedimentary
Shiva Lingam
Cryptocrystalline Quartz (Jasproid/Sandstone) with Iron Oxide (Fe2O3)
sedimentary
Shiva Lingam
Cryptocrystalline Quartz (Jasper/Chalcedony) with Iron Oxide inclusions
sedimentary
Pink Botswana Agate
Silicon Dioxide (SiO₂), a cryptocrystalline variety of Quartz and Chalcedony
sedimentary
Chalcedony with inclusions (Agate/Quartz)
Silicon Dioxide (SiO2)
mineral
Gold Nugget / Flake
Native Gold (Au)
mineral
Chalcedony (Milky Agate/Quartz)
Silicon Dioxide (SiO2)
mineral
Chert (often called Flint or River Stone)
Chert (SiO2)
sedimentary
Granite with Hematite staining
Granitoid (Quartz, Feldspar, Mica) with Iron Oxide (Fe2O3)
igneous
Granite Pebble
Granite (composed of Quartz, Feldspar, and Mica)
igneous
Gossanous Sandstone (likely Terrestrial)
Arenite with Iron-Oxide inclusions
sedimentary
Orange Calcite
Calcium Carbonate (CaCO3)
mineral
Limonite (Iron Ore)
Limonite (FeO(OH)·nH2O)
mineral
Orange Calcite
Calcium Carbonate (CaCO3)
mineral
Agate
Silicon dioxide (SiO2)
mineral
Blue Calcite
Calcium Carbonate (CaCO3)
mineral
Satin Spar (Gypsum)
Calcium Sulfate Dihydrate (CaSO4·2H2O)
mineral
Blue Calcite
Calcium Carbonate (CaCO3)
mineral
Limonite with Hematite
Hydrated iron(III) oxide-hydroxide with variable composition (FeO(OH)·nH2O)
mineral
Limonite with Trace Fossils
Hydrous Iron Oxide Mixture (FeO(OH)·nH2O)
sedimentary
Orange Calcite
Calcium Carbonate (CaCO3)
mineral
Limonite Concretion
Limonite (Hydrated Iron Oxide) FeO(OH)·nH2O
sedimentary
Jasper (Iron-stained)
Silicon Dioxide (SiO2) with iron oxide inclusions
sedimentary
Chert Breccia (with Iron Staining)
Microcrystalline Quartz (SiO2) with iron oxides (Limonite/Goethite)
sedimentary
Chert (Jasper/Jasperoid)
Chert (chemically precipitated microcrystalline Quartz, SiO2)
sedimentary
Petrified Wood
Silicified Wood (primarily Quartz/Chalcedony, SiO2)
sedimentary
Amygdaloidal Rhyolite (often called Lake Superior Agate relative)
Rhyolite with Calcite/Quartz amygdules (SiO2 and secondary minerals)
igneous
Petrified Wood
Silicified Wood (primarily SiO2)
sedimentary