Basalt River Stone
Basalt (Aphanitic Mafic Igneous Rock)
igneous
Category
Not A Rock
Browse not a rock specimens identified by the Rock Identifier community.
Sandstone (Water-worn Pebble)
Clastic Sedimentary Rock (primarily SiO2)
sedimentary
Gneiss (Metamorphic Rock)
Gneiss
metamorphic
Clear Quartz (Rock Crystal)
Silicon Dioxide (SiO2)
mineral
Granite
Granite
igneous
Quartzite pebble
Metamorphic Quartzite (primarily SiO2)
metamorphic
Quartzite
Metamorphosed Quartz Sandstone (SiO2)
metamorphic
Ferruginous Sandstone (Gritstone)
Arenite with Iron-Oxide Cement (SiO2 with Fe2O3 and FeO(OH))
sedimentary
Ferruginous Sandstone
Sandstone (rich in iron oxides/hydroxides)
sedimentary
Coquina
Coquina (Bioclastic Calcarenite)
sedimentary
Red Shale
Lutite (primarily composed of Hydrous Aluminum Silicates with Hematite staining)
sedimentary
Serpentine
Antigorite/Lizardite (Mg, Fe)3Si2O5(OH)4
metamorphic
Serpentine
Antigorite, Lizardite, or Chrysotile (Mg,Fe,Ni,Al,Zn,Mn)2-3(Si,Al,Fe)2O5(OH)4
metamorphic
Serpentine (Serpentinite)
Serpentinite (complex silicate group including lizardite, chrysotile, and antigorite)
metamorphic
Serpentine
Antigorite/Lizardite (Mg,Fe)3Si2O5(OH)4
metamorphic
Collection of Minerals and Ores
Various (e.g., Uraninite (U3O8), Carbon (C), Native Gold (Au), Hematite (Fe2O3), Galena (PbS), etc.)
mineral
Ferruginous Sandstone
Sandstone with Iron Oxide (Limonite/Goethite)
sedimentary
Pumice
Vesicular volcanic glass (primarily Alumino-silicates)
igneous
Dalmatian Jasper
Peralkaline rhyolite with Arfvedsonite inclusions
igneous
Quartzite
Quartzite (primarily SiO2)
metamorphic
Basalt
Extrusive Mafic Igneous Rock (composed primarily of Plagioclase, Pyroxene, and Olivine)
igneous
Dalmatian Stone (Dalmatian Jasper)
Dalmatian Stone (A variety of Perthite / Aplite)
Igneous
Peridotite (Dunite)
Peridotite (mostly Olivine: (Mg,Fe)2SiO4)
igneous
Tiger's Eye (Unpolished)
Pseudomorph of Quartz after Crocidolite (SiO2)
metamorphic
Mica Schist
Schist (Biotite/Muscovite rich)
metamorphic
Basalt with Porphyritic Texture
Porphyritic Basalt
igneous
Fossiliferous Limestone
Calcareous biomicrite / Bioclastic limestone
sedimentary
Sandstone (likely Ferruginous)
Arenite (primarily SiO2 with Fe2O3 staining)
sedimentary
Mica Schist
Mica Schist (primarily Muscovite and Quartz)
metamorphic
Sandstone-based Concrete Fragment
Cementitious Composite with Sedimentary Aggregate
sedimentary (man-made/anthropogenic)
Serpentine (Serpentinite)
Antigorite, Lizardite, or Chrysotile (Mg,Fe,Ni,Al,Zn,Mn)2-3(Si,Al,Fe)2O5(OH)4
metamorphic
River Quartzite (or Quartz Cobble)
Quartzite (primarily Silicon Dioxide - SiO2)
metamorphic
Yellow Quartzite (Iron-Stained Quartz)
Quartzite (SiO2 with Fe-oxide impurities)
metamorphic
Basalt with Iron Oxidation
Extrusive Mafic Igneous Rock (composed of Plagioclase and Pyroxene)
igneous
Quartzite
Quartzite (primarily SiO2)
metamorphic
Granodiorite
Granodiorite (Phaneritic intrusive igneous rock containing Plagioclase, Quartz, and Biotite/Amphibole)
igneous
Chert with Quartz/Calcite Vein
Microcrystalline Silica (SiO2)
sedimentary
Quartzite (Potentially Ferruginous)
Quartzite (SiO2)
metamorphic
Petoskey Stone (Petrified Favosites)
Favosites (extinct colonial coral), CaCO3 with Silica replacement
sedimentary
Porphyritic Andesite
Andesite (porphyritic variety)
igneous
Jasper in Quartzite (likely Cinnabar or Iron inclusions)
Silicon dioxide (SiO2) with impurities
metamorphic
Shale
Shale (Sedimentary rock composed of mud/clay minerals)
sedimentary