Granite with Quartz inclusion
Granite (Mainly SiO2, KAlSi3O8, NaAlSi3O8)
igneous
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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Sapphire
Corundum (Al2O3)
mineral
Red Quartzite (likely Purple/Red variety)
Quartzite (SiO2)
metamorphic
Weathered gray-green pebble
Indeterminate; possibly altered basalt, serpentinite, or a greenish metamorphic rock
mineral
Copper-Bearing Sulfide Ore (likely Chalcopyrite or Bornite)
Chalcopyrite (CuFeS2) or Bornite (Cu5FeS4) in host rock
mineral
Milky Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Quartz Crystal Cluster
Silicon Dioxide (SiO2)
mineral
Quartz Pebble (with Iron Inclusions)
Silicon Dioxide (SiO2)
mineral
Feldspar (specifically Orthoclase or Plagioclase)
Potassium Aluminum Silicate (KAlSi3O8) or Sodium/Calcium Aluminum Silicate
mineral
Milky Quartz
Crystalline Silicon Dioxide (SiO2)
mineral
Brick fragment (Man-made material)
N/A (Fired clay)
man-made
Granitic gneiss (weathered, rounded cobble)
Foliated granitoid; primarily quartz, feldspar, and mica (composition commonly approximates granite)
metamorphic
Basalt with Secondary Mineralization (Likely Zeolites or Calcite)
Aphanitic mafic volcanic rock with secondary mineral inclusions (e.g., CaAl2Si3O10·3H2O for Scolecite)
igneous
Blue Chalcedony and Picture Jasper Beads
Blue Chalcedony (SiO2), Picture Jasper (SiO2)
Mineral
Feldspar (Orthoclase/Microcline)
Potassium Feldspar (KAlSi3O8)
mineral
Milky quartz
Quartz (silicon dioxide, SiO₂)
mineral
Amazonite
Microcline (KAlSi3O8)
mineral
Quartzite Cobble
Metamorphic Quartzite (SiO2)
metamorphic
Fossil Shark Tooth
Elasmobranchii (Lamniformes order likely)
fossil
Pale blue-gray quartz-rich pebble (tentative)
Quartz, SiO₂, possibly chalcedony or a weathered metamorphic fragment
mineral
Quartz Pebble
Silicon Dioxide (SiO2)
Mineral
Jadeite (Nephrite-Jadeite blend)
Jadeite (NaAlSi2O6)
metamorphic
Chert (often called Flint or Jasper based on color)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Granite Pebble
Granite (composed primarily of Quartz SiO2, Feldspar KAlSi3O8, and Mica)
igneous
Graphite-rich schist (probable graphite ore)
Graphite schist; chiefly graphitic carbon (C) with quartz, mica, and possibly feldspar
metamorphic
Schorl (Black Tourmaline)
Sodium Iron Aluminum Borosilicate (NaFe3Al6(BO3)3Si6O18(OH)4)
mineral
Goldstone (Brown/Gold)
Aventurine Glass (Man-made glass with Copper inclusions)
gemstone
Coal (most likely Bituminous or Anthracite)
Bituminous Coal (Grade of Coal), Anthracite (Grade of Coal)
Sedimentary Rock
Limestone River Pebble
Sedimentary Calcium Carbonate (CaCO3)
sedimentary
Chert (Jasper)
Microcrystalline Quartz (SiO2)
sedimentary
Desert Varnish on Sandstone
Quartz Arenite with Iron-Manganese Oxide Coating
sedimentary
Quartz Vein in Gneiss/Granite
Silicon Dioxide (SiO2) in Feldspar-Quartz Gneiss host rock
metamorphic
Sandstone with Quartz Sphere
Arenite (SiO2-rich sedimentary rock) with Quartzite/Rose Quartz sphere
sedimentary
Jasper and Basalt (Mixed Breccia or Chert)
Silicon Dioxide (SiO2) with Ferromagnesian silicates
sedimentary and igneous (mixed)
Granite
Phaneritic plutonic rock (SiO2 + Al2O3)
igneous
Quartz-rich metamorphic rock, likely quartzite
Quartzite; predominantly quartz (SiO₂) with iron-oxide staining and minor feldspar/mica
metamorphic
Clear Quartz (beads in a bracelet)
Quartz (SiO2)
Mineral
Chert (Field Stone/Pebble)
Microcrystalline or cryptocrystalline Quartz (SiO2)
sedimentary
Granite Cobble
Granitoid (composed mainly of Quartz, Feldspar, and Mica)
igneous
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Basalt (Porphyritic)
Basalt (Mafic Extrusive Igneous Rock)
igneous
Banded Agate
Silicon Dioxide (SiO2) - Microcrystalline Quartz
sedimentary