Red Jasper
Silicon Dioxide (SiO2) with Hematite inclusions
sedimentary
Category
Sedimentary Rock (Specifically A Concretion Or Possibly A Geode)
Browse sedimentary rock (specifically a concretion or possibly a geode) specimens identified by the Rock Identifier community.
Jasper Conglomerate (Puddingstone)
Jasper Conglomerate (Siliceous Sedimentary Rock)
sedimentary
Chalcedony (Botryoidal Agate vein)
Chalcedony (Microcrystalline Quartz) - SiO2
mineral
Druzy Quartz Geode (Vug)
Silicon Dioxide (SiO2)
mineral
Agate (specifically a Yellow/Honey Agate)
Silicon Dioxide (SiO2) - Microcrystalline Quartz
mineral
Boxwork Siderite or Sepatarian Nodule Weathering
Siderite (FeCO3) with secondary mineralization or Boxwork Geode fragment
sedimentary
Bumblebee Jasper
Calcite-Auripigment-Pyrite-Realgar assemblage (Carbonate/Sulphide mixture)
mineral
Sandstone (River Cobble)
Arenite
sedimentary
Quartz (Drusy/Crystalline variety)
Silicon Dioxide (SiO2)
mineral
Milky Quartz (Druzy Geode fragment)
Silicon Dioxide (SiO2)
mineral
Conglomerate
Polymictic Conglomerate
sedimentary
Marble
Recrystallized Carbonate Rock (CaCO3)
metamorphic
Limonite (Ironstone Concretion)
Limonite (Hydrated iron(III) oxide-hydroxide, mixtures of FeO(OH)·nH2O)
sedimentary
Amethyst
Amethyst (Silicon Dioxide - SiO2 with ferric iron impurities)
mineral
Chert (Flint)
Microcrystalline quartz (SiO2)
sedimentary
Kambaba Jasper
Stromatolite (Fossilized Algae)
sedimentary
Chert (Jasper)
Chert / Microcrystalline Quartz (SiO2)
sedimentary
Clear Quartz
Quartz (Silicon Dioxide, SiO2)
mineral
Septarian Nodule
Septarian concretion (Complex mixture of Siderite/Limestone, Calcite, and Aragonite)
sedimentary
Banded Agate (specifically Black Sardonyx/Onyx variety)
Silicon Dioxide (SiO2) - Cryptocrystalline Quartz
mineral
Quartzite
Metamorphosed Quartz Sandstone (SiO2)
metamorphic
Quartz Druzy on Geode Fragment
Silicon Dioxide (SiO2)
mineral
Chert (Septarian Concretion/Nodule)
Microcrystalline silica (SiO2) with carbonate mineral veining
sedimentary
Chalcedony (variations like Agate or Jasper)
Chalcedony (SiO₂ - microcrystalline quartz)
Mineral
Sandstone (specifically Flagstone)
Arenite (primarily composed of SiO2)
sedimentary
Red Sandstone (Hematitic)
Clastic sedimentary rock (SiO2 with Fe2O3 inclusions)
sedimentary
Chalcedony (Agate/Carnelian)
Cryptocrystalline Silicon Dioxide (SiO2)
mineral
Sandstone (Ferruginous)
Arenite (Fe-rich)
sedimentary
Sandstone (Micaceous/Feldspathic variant)
Arenite (specifically subarkose or lithic arenite)
sedimentary
Dendritic Agate
Dendritic Agate (Silicon Dioxide with Manganese or Iron Oxide inclusions, SiO2)
mineral
Clear Quartz Cluster
Quartz (Silicon Dioxide - SiO2)
mineral
Celestite (Celestine) Geode
Strontium Sulfate (SrSO4)
mineral
Septarian Nodule (Dragon Stone)
Septarian concretion (composition: CaCO3 - Calcite, Aragonite, and Siderite/Limestone)
sedimentary
Amethyst and Ruby in Zoisite
Silicon Dioxide (SiO2) and Anyolite (Zoisite-Hornblende-Ruby mix)
mineral and metamorphic rock
Chert (Nodule / Geode fragment)
Microcrystalline Quartz (SiO2)
sedimentary
Sandstone
Arenite (primarily SiO2 with iron oxide cementation)
sedimentary
Basalt
Mafic volcanic rock (Basalt)
igneous
Quartz (Milky/Clear variety)
Silicon Dioxide (SiO2)
mineral
Porphyry (specifically Porphyritic Rhyolite or Andesite)
Porphyritic Igneous Rock (composed of Phenocrysts in an Aphanitic groundmass)
igneous
Chert
Siliceous sedimentary rock (predominantly microcrystalline quartz, SiO2)
Sedimentary
Red Jasper with Quartz and Hematite
Silicon Dioxide (SiO2) with Ferric Iron inclusions
sedimentary
Green Jasper with Agate Banding
Silicon Dioxide (SiO2) with impurities of ferrous silicate or chlorite
sedimentary (chemical/biological origin)