Polished Stone Pendant (Identity Unclear)
Unknown (Possibly Jasper/Agate/Quartz mixture)
mineral
Category
Sedimentary Or Metamorphic (Base Substrate)
Browse sedimentary or metamorphic (base substrate) specimens identified by the Rock Identifier community.
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Cardstock (Paper)
Cellulose (C6H10O5)n
sedimentary (man-made)
River Pebble (Likely Quartzite or Chert)
Quartzite (primarily SiO2)
metamorphic
River Stone (River Pebble)
Stream-rounded clast (likely Quartzite or Siltstone)
sedimentary
River Rock (Basalt/Greywacke pebbles)
Fluvial gravel primarily composed of Mafic Volcanic Rock (Basalt) or Lithic Sandstone (Greywacke)
igneous and sedimentary
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
River Stone (likely Quartzite or Chert)
Recrystallized Silicon Dioxide (SiO2)
metamorphic
Painted Garden Rock (likely Granite or Limestone base)
Silicon Dioxide (SiO2) / Calcium Carbonate (CaCO3) based substrate with Acrylic/Enamel pigments
igneous or sedimentary (anthropogenic modification)
Slate
Foliated metamorphic rock
metamorphic
Quartz Pebble
Silicon Dioxide (SiO2)
sedimentary
Quartz Pebble
Silicon Dioxide (SiO2)
sedimentary
Basalt with Plagioclase or Quartz Inclusion
Melanocratic Basalt with Porphyritic Inclusion
igneous
Siltstone Pebble
Siltstone (composed of siliciclastic grains)
sedimentary
River Stone (Quartzite/Siltstone)
Quartzite (primarily SiO2)
metamorphic
River Pebbles (Basalt and Graywacke/Limestone)
Mafic Volcanic Rock / Impure Sandstone
igneous and sedimentary
River Pebble (Chalcedony / Quartzite)
Silicon Dioxide (SiO2)
sedimentary
River Pebble (Quartz-rich)
Silicon Dioxide (SiO2) with various inclusions
sedimentary
Quartzite (River Siltstone variety)
Quartzite (SiO2)
metamorphic
Seashell Fragment (Aragonite/Calcite)
Calcium Carbonate (CaCO3) - Shell fragment
sedimentary
River Pebble (Greywacke / Sandstone Pebble)
Indurated Sandstone / Greywacke Pebble
sedimentary
River Pebbles (White Quartz and Basalt mix)
Mixed Clastic Sedimentary Assemblage (SiO2 and Mafic Volcanics)
sedimentary
Quartz Pebble
Silicon dioxide (SiO2)
sedimentary
River Pebble
Lithified rock fragment (variable composition)
sedimentary
River Rock
Silica-rich water-worn rock / Quartzite
sedimentary
Sapphire (Corundum variety)
Sapphire (Al₂O₃)
Mineral
River Rocks (Basalt and Sedimentary Stones)
Mafic Igneous Rock (Basalt) and Clastic Sedimentary Rock
igneous and sedimentary
Quartz Pebble
Quartz (Silicon Dioxide, SiO2)
sedimentary
Carbonate Beach Sand
Biogenic Carbonate Sediment (CaCO3)
sedimentary
Quartzite (River Pebbles)
Metamorphosed Sandstone (SiO2)
metamorphic
Basalt Pebble with Epidote/Olivine
Vitreous Basalt (SiO2 with Ca/Mg/Fe silicates)
igneous
Basalt (Water-worn Pavement Stone)
Basalt (Mafic Extrusive Igneous Rock)
igneous
River Stone (likely Siltstone or fine-grained Quartzite)
Sedimentary clastic rock containing SiO2 and iron oxides
sedimentary
River Stone (Chalcedony/Jasper variety)
Microcrystalline Quartz (SiO2)
sedimentary
Lava Rock Substrate
Scoria (Basaltic Rock)
igneous
River Pebble (Gneiss or Quartzite variant)
Course-grained Metamorphic Rock (likely SiO2 dominant)
metamorphic
River Stone (Basalt or Siltstone with banding)
Polished Basaltic or Siliciclastic River Cobble
igneous or sedimentary
River Pebble (Siltstone/Mudstone)
Clastic sedimentary rock
sedimentary
River Pebble (Basalt / Greywacke)
Stream-rounded fine-grained rock (Basalt / Metagreywacke)
sedimentary
River Pebble (Siltstone / Fine-grained Sandstone)
Sedimentary Pebble (Siliclastic)
sedimentary
Yellow Quartzite River Pebbles
Metamorphic Silicon Dioxide (SiO2) with iron oxide inclusions
metamorphic
White Buffalo Turquoise (or Howlite/Magnesite)
Calcite/Dolomite or Magnesite with Chert/Quartz inclusions
gemstone