Chert (White-Tan variety)
Silicon dioxide (SiO2) / Microcrystalline Quartz
sedimentary
Category
Minerals
Browse minerals specimens identified by the Rock Identifier community.
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Ferruginous Quartz
Iron-stained Quartz (SiO2 with Fe2O3 impurities)
mineral
Fossilized Coral (Favosites)
Favosites goldfussi / Tabulata
sedimentary
Tiger's Eye (specifically Blue/Golden mixed or Hawk's Eye)
Pseudomorph of Quartz after Crocidolite (SiO2)
metamorphic
Oolitic Ironstone
Sedimentary Ooidal Ironstone (Limonite/Hematite mixture)
sedimentary
Basalt with Iron Oxidation
Mafic Igneous Rock (Basalt)
igneous
Petrified Wood
Silicified Wood (SiO2)
sedimentary
Marble
Recrystallized Carbonate Rock (CaCO3)
metamorphic
Fossilized Coral
Scleractinia (fossil order), primarily Calcium Carbonate (CaCO3)
sedimentary
Dalmatian Jasper (Dalmatian Stone)
Dalmatian Stone (primarily Feldspar, Quartz, and Arfvedsonite/Tourmaline)
igneous
Quartzite (with Iron Staining)
Metamorphosed Quartz Sandstone (SiO2)
metamorphic
Quartzite with Hematite staining
Quartzite (SiO2) with iron oxide inclusions
metamorphic
Fossilized Horn Coral
Order Rugosa (Rugose Coral)
sedimentary
Unakite
Unakitized granodiorite / Quartz-Epidote-Feldspar rock
metamorphic
Ironstone Concretion
Siderite or Limonite Concretion
sedimentary
Caliche (with Lichen Cover)
Calcium carbonate-cemented soil layer (CaCO3)
sedimentary
Turquoise (likely Stabilized or Dyed Howlite/Magnesite)
Hydrated phosphate of copper and aluminium - CuAl6(PO4)4(OH)8·4H2O
mineral
Blue Quartzite
Quartzite (primarily SiO2 with inclusions)
metamorphic
Prase quartz with actinolite inclusions
Silicon dioxide (SiO2) with Calcium Magnesium Iron Silicate Hydroxide inclusions
mineral
Olivine (Peridot)
Magnesium Iron Silicate (Mg,Fe)2SiO4
mineral
Chert
Chert (Microcrystalline Quartz, SiO2)
sedimentary
Feldspar Rich Granite with Limonite Staining
K-Feldspar Granite (KAlSi3O8)
igneous
Chert (Cherty Limestone / Flint)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Quartz Geode
Crystalline Silicon Dioxide (SiO2) in a Geodic structure
mineral
Moonstone
Feldspar (Orthoclase with Albite), (K,Na)AlSi3O8
mineral
Iron Slag
Iron/Steel Slag (Ferrosilicate Glass)
industrial byproduct (anthropogenic material)
Clear Quartz
Silicon Dioxide (SiO2)
mineral
Ironstone Concretion
Siderite or Goethite Concretion
sedimentary
Carnelian Agate
Chalcedony (Silicon Dioxide, SiO2)
mineral
Mica Schist
Muscovite/Biotite Schist
metamorphic
Puddingstone
Conglomerate
sedimentary
Septarian Nodule
Septarian Concretion (CaCO3 / Fe2O3 / SiO2)
sedimentary
Yellow Jasper
Microcrystalline Quartz with Iron Oxide (SiO2)
sedimentary
Blue Quartzite
Quartzite (silicon dioxide, SiO2)
metamorphic
Sagenitic Agate (with Goethite/Rutile inclusions)
Silicon Dioxide (SiO2) with hydrous ferric oxide inclusions
mineral
Red Sandstone
Arenite (primarily Quartz, SiO2, with Iron Oxide/Hematite)
sedimentary
Bumblebee Jasper
Hydrothermal Volcanic Rock (Primarily Calcite with Orpiment - As2S3, Realgar, and Pyrite)
igneous
Milky Quartz
Quartz (Silicon Dioxide - SiO2)
mineral
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Druzy Quartz
Crystalline Silicon Dioxide (SiO2)
mineral
Yellow Ocherous Siltstone (Limonitic Shale)
Limonitic Siltstone / Goethite-rich Sedimentary Rock
sedimentary
Quartzite with Schist Inclusions
Metamorphosed Quartzite (SiO2) with minor mica/chlorite schist
metamorphic