Granodiorite Pebble
Granodiorite
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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Conglomerate
Conglomerate (clastic sedimentary rock)
sedimentary
Conglomerate
Sedimentary Conglomerate
sedimentary
Greenstone
Metabasalt / Chlorite schist
metamorphic
Fuchsite on Quartz
Muscovite (KAl2(AlSi3O10)(OH)2) with Chromium impurities
metamorphic
Quartzite Pebble
Quartzite (SiO2)
metamorphic
Hardened Gray Mudstone
Argillite / Silicified Mudstone (principally SiO2 and Al2Si2O5(OH)4)
sedimentary
Banded Iron Formation (BIF) / Gneiss
Banded Iron Formation (BIF)
metamorphic
Emerald In Matrix
Beryl (Be3Al2Si6O18 with Chromium/Vanadium impurities)
gemstone
Quartzite River Pebble
Quartzite (mostly SiO2)
metamorphic
Quartzite Cobble
Quartzite (primarily SiO2)
metamorphic
Quartzite
Quartzite (SiO2)
metamorphic
Basalt (Weathered)
Mafic Igneous Rock
igneous
Quartzite
Quartzite (SiO2 silicon dioxide)
metamorphic
Pink Sapphire
Corundum (Al2O3 with chromium and iron traces)
gemstone
Almandine Garnet & Tumbled Citrine Quartz
Fe3Al2(SiO4)3 (Garnet) and SiO2 (Quartz)
mineral
Rough Emerald
Beryl (Be3Al2Si6O18 with Chromium/Vanadium impurities)
gemstone
Quartz-rich metamorphic rock, likely quartzite
Quartzite; predominantly microcrystalline quartz (SiO₂), possibly with feldspar, mica, and iron-oxide impurities
metamorphic
Aventurine
Silicon dioxide (Quartz) with inclusions (KAl2(AlSi3O10)(OH)2)
mineral
Light-colored granite or granitic gneiss
Granite; primarily quartz (SiO₂), feldspar, and minor mica, possibly with gneissic fabric
igneous
Quartzite (River Cobble)
Recrystallized Quartz (SiO2)
metamorphic
Quartzite Pebble
Quartzite (primarily SiO2)
metamorphic
Fuchsite (Chrome Mica)
K(Al,Cr)2(AlSi3O10)(OH)2
mineral
River Cobble with Algae Patina
Weathered Chert or Quartzite pebble (SiO2 dominated)
sedimentary
Blue Sapphire
Corundum (Al2O3) with iron and titanium impurities
mineral
Orthoclase Feldspar
KAlSi3O8 (Potassium Aluminum Silicate)
mineral
Potassium Feldspar
K-Feldspar (KAlSi3O8)
mineral
Tumbled blue-gray mineral specimen
Indeterminate; possibly dumortierite quartz, sodalite, or dyed stone
mineral
Quartzite (River Pebble)
Metamorphic Quartzite (primarily SiO2)
metamorphic
Quartzite Pebbler
Quartzite (primarily SiO2)
metamorphic
Milky Quartz Pebble
Quartz (Silicon Dioxide, SiO2)
mineral
Quartzite (River Stone)
SiO2 (Silicon Dioxide)
metamorphic
Potassium Feldspar
K-Feldspar (Orthoclase/Microcline) KAlSi3O8
mineral
Smoky Quartz
Silicon Dioxide (SiO2) with aluminum impurities
mineral
Feldspar (Orthoclase)
Potassium Feldspar (KAlSi3O8)
mineral
Green Aventurine
Quartz variant (SiO2) with Fuchsite inclusions
mineral
Sandstone (likely Greywacke variant)
Arenite
sedimentary
Quartz with Schist/Mica Inclusions
Crystalline Silicon Dioxide (SiO2) with Phyllosilicates
metamorphic
Iron-stained quartzite or chert
Quartzite, predominantly SiO₂, with iron-oxide staining
metamorphic
Quartz
Silicon Dioxide (SiO2)
mineral
Milky quartz-bearing rock, possibly quartzite
Quartz (SiO₂), likely in a quartzite or quartz-rich metamorphic matrix
metamorphic
Pearl
Calcium Carbonate (CaCO3) + Conchiolin
mineral