Banded Pebble (Metamorphic Slate or Gneiss with Quartz Veining)
Metamorphic Rock with Quartz/Calcite Veins
metamorphic
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.
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Rhodonite-bearing metamorphic rock
Manganese-rich metamorphic rock, chiefly rhodonite (MnSiO₃), with quartz and manganese oxides
metamorphic
Quartzite (River Pebble)
Metamorphosed Quartz Sandstone (SiO2)
metamorphic
Sandstone (Quartz Sandstone)
Arenite (primarily SiO2)
sedimentary
Painted River Rock
Polished fluvial clast with acrylic/synthetic pigment coating
Sedimentary or Metamorphic (base substrate)
Vesicular Basalt (River Pebble)
Basalt (Mafic volcanic rock)
igneous
Orthoclase (Potassium Feldspar)
KAlSi3O8 (Potassium Aluminum Silicate)
mineral
Anthracite Coal
Anthracite (Carbon-based metamorphic rock, 86-97% C)
metamorphic
Anthracite Coal
Anthracite (Carbon-based sedimentary rock typically classified as metamorphic)
metamorphic
Quartzite Pebble (River Rock)
Quartzite (SiO2)
metamorphic
Rough Emerald/Green Beryl
Beryl (Be3Al2(SiO3)6) with trace amounts of Chromium or Vanadium
mineral
Amazonite (likely mixed with other feldspars/minerals)
Amazonite is a variety of Microcline, which is a tectosilicate mineral, formula KAISi3O8. The mixed beads could include other feldspars or quartz.
Mineral
Rough Garnet (Almandine)
Almandine Garnet (Fe3Al2(SiO4)3)
mineral
Ruby (varietal of Corundum)
Corundum (Al2O3:Cr)
gemstone
Black Tourmaline (Schorl)
Schorl (NaFe2+3Al6(Si6O18)(BO3)3(OH)3OH)
mineral
Quartzite Pebble (with Iron Staining)
Quartzite (SiO2)
metamorphic
Basalt with Magnetite
Crystalline Basalt (Primarily Plagioclase and Pyroxene) with Magnetite (Fe3O4)
igneous
Slickenside
Tectonic Fault Scarp Surface
metamorphic
Quartzite (River Stone)
Quartzite (composed primarily of Silicon Dioxide, SiO2)
metamorphic
Porphyritic Basalt
Porphyritic Mafic Volcanic Rock
igneous
Rounded gray river cobble
Likely basalt or fine-grained mafic volcanic rock; exact identification requires testing
igneous
Quartzite (or Chert/Flint gravel)
Quartzite (SiO2 with iron oxide inclusions)
metamorphic
Crushed Stone (Likely Granite or Diabase)
Intrusive Igneous Rock (Granitoid/Gabbroid)
igneous
Quartzite River Cobble
Quartzite (primarily SiO2)
metamorphic
Amazonite
Microcline Feldspar (KAlSi3O8)
mineral
Emerald in Matrix
Beryl (Be3Al2Si6O18) with Chromium/Vanadium impurities
mineral
Iron-rich quartzite or ferruginous metamorphic rock
Quartzite, predominantly SiO₂, stained by iron oxides (hematite/goethite)
metamorphic
Quartzite Pebble
Metamorphosed Quartz Sandstone (SiO2)
metamorphic
Garnet-bearing Schist
Almandine Garnet (Fe3Al2(SiO4)3) in Mica Schist
metamorphic
Orange Quartzite / Quartz River Siltstone
Quartzite (SiO2)
metamorphic
Riverstone (likely Gray Slate or Siltstone)
Metamorphosed fine-grained sedimentary rock (Argillite/Slate)
metamorphic
Vesicular Basalt with Calcification
Vesicular Basalt (Aphanitic extrusive igneous rock)
igneous
Jasper-bearing Quartzite River Cobble
Tectonized Quartzite with Iron-Oxide (Hematite/Limonite) Veining
metamorphic
Engraved polished dark stone (likely slate or basalt)
Probable fine-grained slate (microcrystalline phyllosilicates), possibly basalt; exact identification requires testing
metamorphic
Greenstone
Metabasalt (composed of chlorite, epidote, and actinolite)
metamorphic
Quartzite
Quartzite (primarily SiO2)
metamorphic
Quartzite River Rock (with iron staining)
Metamorphosed Sandstone (SiO2)
metamorphic
Ruby
Corundum (Al2O3) with Chromium traces
mineral
Greenschist
Greenschist facies metamorphic rock
metamorphic
Industrial Slag
Anthropogenic Vitreous Slag
igneous
Milky Quartz with Mica and Pyrite
Quartz (SiO2) with Muscovite (KAl2(AlSi3O10)(OH)2) and Pyrite (FeS2)
mineral
Granite
Phaneritic intrusive igneous rock
igneous