Reddish Brown Claystone or Siltstone
Argillite / Siltstone / Claystone
sedimentary
Category
Metamorphic (Likely Gneiss Or Schist Based On Texture)
Browse metamorphic (likely gneiss or schist based on texture) specimens identified by the Rock Identifier community.
Basalt
Extrusive Mafic Igneous Rock
igneous
Granite
Granite
igneous
Quartzite
Quartzite (Mainly SiO2)
metamorphic
Basalt
Mafic Igneous Rock (primarily Plagioclase and Pyroxene)
igneous
Limestone (specifically Dolomitic/Crystalline Limestone)
Sedimentary Carbonate Rock (CaCO3 / CaMg(CO3)2)
sedimentary
Jasper and Aquamarine (likely)
Jasper (Cryptocrystalline Quartz (SiO2)), Aquamarine (Beryl (Be3Al2Si6O18))
Sedimentary (Jasper), Mineral (Aquamarine)
Pink Granite
Phaneritic Felsic Igneous Rock (Granite, rich in Potassium Feldspar)
igneous
Basalt
Extrusive mafic igneous rock
igneous
Milky Quartz (Gold-bearing Prospecting Specimen)
Silicon Dioxide (SiO2)
mineral
Basalt
Mafic Igneous Rock (primarily Plagioclase and Pyroxene)
igneous
Coquina / Limonite-stained Limestone
Sedimentary Limestone with Iron Oxyhydroxide (FeO(OH)·nH2O)
sedimentary
Basalt
Basalt (composition: Plagioclase, Pyroxene, and Olivine)
igneous
Quartzite
Quartzite (primarily SiO2)
Metamorphic
Amazonite
Amazonite (KAlSi3O8) - a variety of Microcline Feldspar
Mineral
Quartzite
Quartzite (SiO2)
metamorphic
Basalt
Basalt (Mafic volcanic rock)
igneous
Basalt
Basalt (Aphanitic-to-porphyritic mafic volcanic rock)
igneous
Coquina / Fossiliferous Limestone
Calcite-rich Bioclastic Sedimentary Rock (CaCO3)
sedimentary
Quartzite with Quartz Veining
Quartzite (primarily SiO2)
metamorphic
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Green Quartzite
Meta-quartzite with Fuchsite inclusions (K(Al,Cr)2(AlSi3O10)(OH)2 + SiO2)
metamorphic
Orange Quartzite (River Pebble)
Quartzite (SiO2 with iron oxide inclusions)
metamorphic
Quartzite (River Stone)
Quartzite
metamorphic
Pink Quartzite
Quartzite (primarily SiO2)
metamorphic
Quartzite Pebble
Metamorphosed Quartz Sandstone (SiO2)
metamorphic
Red Quartzite
Quartzite (primarily SiO2)
metamorphic
Quartzite
Quartzite (primarily SiO2)
metamorphic
Ferruginous Sandstone (River Pebble)
Clastic Sedimentary Rock (primarily SiO2 with Fe2O3 cement)
sedimentary
Quartz with Mica (Pegmatite)
Quartz (SiO2) and Muscovite (KAl2(AlSi3O10)(OH)2)
igneous
Green Quartzite
Quartzite (primarily SiO2 with chlorite inclusions)
metamorphic
Green Quartzite
Metamorphic rock primarily composed of Silicon Dioxide (SiO2) with mineral inclusions like fuchsite or chlorite
metamorphic
Serpentinite
Serpentinite (complex of Antigorite, Lizardite, and Chrysotile, Mg3Si2O5(OH)4)
metamorphic
Marble
Metamorphosed Limestone (main mineral: Calcite, CaCO3)
metamorphic
Shale or Slate with Quartz Veins
Shale (fine-grained clastic sedimentary rock) or Slate (low-grade metamorphic rock formed from shale) with Quartz (SiO2) veins
Metamorphic, likely Sedimentary with Quartz veins
Quartzite with Sandstone/Iron staining
Metamorphic Quartzite (SiO2)
metamorphic
Vesicular Basalt (River Pebble)
Vesicular Basalt
igneous
Basalt with Scoria and potential Olivine/Pyroxene inclusions
Vesicular Basalt
igneous
Green Aventurine (Quartzite)
Silicon Dioxide (SiO2) with inclusions of Fuchsite (Mica)
metamorphic
Serpentinite
Serpentinite (Mg, Fe, Ni, Al, Zn, Mn)2-3(Si, Al, Fe)2O5(OH)4
metamorphic
Diorite
Phaneritic plutonic rock (dominated by plagioclase feldspar and hornblende)
igneous
Basalt
Basalt (Mafic Extrusive)
igneous