Almandine Garnet in Matrix
Almandine Garnet (Fe3Al2(SiO4)3)
metamorphic
Category
Sedimentary Rock
Browse sedimentary rock specimens identified by the Rock Identifier community.
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Schist
Chlorite/Mica Schist
metamorphic
Agate
Silicon Dioxide (SiO2)
mineral
Chalcedony (Agate/Chert variety)
Silicon Dioxide (SiO2)
mineral
Schist
Mica Schist
metamorphic
Tumbled Agate
Agate (Cryptocrystalline variety of Quartz, SiO2)
sedimentary
Fossiliferous Limestone
Biogenic Limestone (Calcium Carbonate, CaCO3)
sedimentary
Chert (Iron-stained)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Red Sandstone
Arenite (Ferruginous Sandstone)
sedimentary
Sandstone
Arenite (primarily SiO2, silica)
sedimentary
Jasper Conglomerate (Puddingstone)
Siliceous Conglomerate (Quartz and Jasper clasts in a fine-grained matrix)
sedimentary
Gneiss (specifically a Banded Gneiss cobble)
Gneiss (composed mainly of Quartz, Feldspar, and Biotite/Amphibole)
metamorphic
Sandstone (Ferruginous)
Ferruginous Sandstone (SiO2 with Fe2O3)
sedimentary
Jasper and Agate
Microcrystalline Quartz (SiO2)
sedimentary
Siltstone Pebble
Siltstone (composed of hydraulic-sorted silt-sized particles)
sedimentary
Chert (Flint) River Pebble
Microcrystalline Quartz (SiO2)
sedimentary
Red Jasper
Jasper (Silica with Hematite inclusions), SiO2
sedimentary
Fossiliferous Limestone
Biogenic Limestone (Calcium Carbonate, CaCO3)
sedimentary
Oolite (Ooids)
Oolitic Limestone (Principal mineral: Calcite, CaCO3)
sedimentary
Chert (Yellow/Tan)
Microcrystalline Quartz (SiO2)
sedimentary
Chert (Nodular Chert)
Silicon Dioxide (SiO2)
sedimentary
Chert (Jasper type)
Microcrystalline Quartz (SiO2)
sedimentary
Chert (Jasper/Mudstone)
Silicon Dioxide (SiO2)
sedimentary
Bauxite (Pisolitic Bauxite)
Bauxite (mixture of Hydrous Aluminum Oxides)
sedimentary
Chert (often found within Limestone)
Silicon Dioxide (SiO2) - Microcrystalline Quartz
sedimentary
Greywacke with Quartz Vein
Greywacke (immature sandstone) with SiO2 inclusions
sedimentary
Chert (variations include Flint or Jasper)
Silicon Dioxide (SiO2)
sedimentary
Chert (Flint) Pebble
Microcrystalline Quartz (SiO2)
sedimentary
Coquina
Bioclastic Limestone (composed primarily of CaCO3)
sedimentary
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Coquina
Bioclastic Limestone (Calcium Carbonate, CaCO3)
sedimentary
Chert (River Pebble)
Microcrystalline Quartz (SiO2)
sedimentary
Conglomerate (River Rock Aggregate)
Conglomerate (Lithic-clast conglomerate)
sedimentary
Gneiss
Gneiss (high-grade metamorphic rock typically composed of quartz, feldspar, and mica)
metamorphic
Ferruginous Sandstone (Ironstone)
Ferruginous Sandstone / Limonite-cemented Quartz Sandstone
sedimentary
Ferruginous Sandstone (with ripple marks)
Arenite with Iron-Oxide (Fe2O3) cement
sedimentary
Carnelian (Orange Agate)
Silicon Dioxide (SiO2)
mineral
Green Jasper with Agate Banding
Silicon Dioxide (SiO2) with impurities of ferrous silicate or chlorite
sedimentary (chemical/biological origin)
Blue Agate (Dyed)
Silicon Dioxide (SiO2)
mineral
Fluorite (Rainbow Fluorite)
Calcium Fluoride (CaF2)
mineral
Clear Quartz Crystal
Silicon Dioxide (SiO2)
mineral
Chalcedony (Agate/Carnelian precursor)
Chalcedony (Silicon Dioxide, SiO2)
mineral