Banded Agate (specifically Lake Superior Agate style)
Silicon Dioxide (SiO2) - Chalcedony variety
mineral
Category
Mineral (Or Mineraloid If Microcrystalline)
Browse mineral (or mineraloid if microcrystalline) specimens identified by the Rock Identifier community.
Banded Agate (Polished Slice)
Chalcedony (cryptocrystalline Quartz), SiO2
mineral
Petrified Wood
Silicified Wood (primarily Quartz/Chalcedony, formula: SiO2)
sedimentary
Quartz Vein in Host Rock
Quartz (SiO2) in Mafic or Sedimentary Matrix
igneous
Ironstone Concretion (Moqui Marble)
Iron Oxide Concretion (Fe2O3 / FeO(OH) mixed with SiO2)
sedimentary
Red Jasper
Silicon dioxide (SiO2) with Iron Oxide (Fe2O3) inclusions
sedimentary
Yellow Jasper
Silicon Dioxide (SiO2) with iron oxide inclusions
sedimentary
Green Aventurine
Silicon Dioxide (SiO2) with inclusions of Fuchsite (K(Al,Cr)3Si3O10(OH)2)
metamorphic
Moss Agate
Silicon Dioxide (SiO2) with inclusions of hornblende, chlorite, or manganese/iron oxides
mineral
Agate (Thunderegg segment)
Silicon dioxide (SiO2) - Microcrystalline Quartz/Chalcedony
mineral
Quartzite River Rock
Quartzite (primarily SiO2)
metamorphic
Shale or Siltstone
Sedimentary Clastic Rock (Variable mineral composition including quartz and clay minerals)
sedimentary
Jasper Shard / Chert
Silicon dioxide (SiO2)
sedimentary
Laterite (iron-rich nodule, possibly Bauxite as a subtype)
Laterite (composed of various minerals including goethite, hematite, gibbsite, etc.)
Sedimentary
Petrified Wood (Agatized/Silicified Wood)
Silicified Wood / Chalcedony (SiO2)
sedimentary
Carnelian
Carnelian (Microcrystalline Quartz, SiO2 with Fe2O3 impurities)
Mineral
Chert (and/or Chalcedony)
Silicon dioxide (SiO2)
sedimentary
Jasper (Yellow Jasper)
Silicon Dioxide (SiO2) with iron inclusions
sedimentary
Chert (Flint variety)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Dalmatian Stone (often called Dalmatian Jasper)
Peralkaline Quartz-Feldspar Rock with Arfvedsonite (formerly believed to be Jasper)
igneous
Travertine
Travertine (CaCO3 - Calcium Carbonate)
sedimentary
Green Jasper
Jasper (variety of Microcrystalline Quartz, SiO2)
sedimentary
Blue Chalcedony
Silicon Dioxide (SiO2)
mineral
Dolomite or Limestone (Carbonate Rock)
CaMg(CO3)2 (Dolomite) or CaCO3 (Limestone / Calcite)
sedimentary
Jasper
Silicon Dioxide (SiO2)
sedimentary
Jasper
Jasper (Silicon Dioxide, SiO2)
sedimentary
Chert (Nodule)
Silicon Dioxide (SiO2)
sedimentary
Chert (Nodule)
Chert (composed of Microcrystalline Silica/SiO2)
sedimentary
Chert (varietal: Flint/Jasper mix)
Hydrous Silica (SiO2)
sedimentary
Fossiliferous Chert (with Brachiopod or Mollusk fragments)
Silicon dioxide (SiO2) with Calcium Carbonate (CaCO3) inclusions
sedimentary
Petrified Wood
Silicified Wood (SiO2)
sedimentary
Caliche (with Lichen Cover)
Calcium carbonate-cemented soil layer (CaCO3)
sedimentary
Bog Iron / Limonite Concretion
Goethite/Limonite mixture (FeO(OH)·nH2O)
sedimentary
Dalmatian Jasper (Dalmatian Stone)
Perthitic feldspar with Arfvedsonite inclusions
igneous
Chert (specifically Flint or Gray Chert)
Silicon Dioxide (Microcrystalline Quartz), SiO2
sedimentary
Ironstone Concretion (Moqui Marble Type)
Goethite/Hematite-cemented Sandstone Concretion
sedimentary
Jasper with Agate and Quartz Inclusions
Silicon Dioxide (SiO2) - Chalcedony / Quartz aggregate
sedimentary
Green Jasper
Silicon dioxide (SiO2) with impurities
sedimentary
Jasper (Tumbled)
Silicon Dioxide (SiO₂)
sedimentary (cryptocrystalline quartz)
Zebra Marble
Metamorphosed Alabaster/Limestone (CaCO3)
metamorphic
Quartzite
Quartzite (SiO2)
metamorphic
Red Brecciated Jasper
Silicon Dioxide (SiO2) with Hematite inclusions
sedimentary