Sandstone
Arenite (mainly SiO2 with varying cements)
sedimentary
Category
Synthetic Polymer (Synthetic Material)
Browse synthetic polymer (synthetic material) specimens identified by the Rock Identifier community.
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Sandstone
Arenite (SiO2 principal)
sedimentary
Sandstone
Arenite (SiO2 based)
sedimentary
Sandstone (with Chert/Quartzite)
Arenite (SiO2 primarily)
sedimentary
Sandstone
Arenite (primarily SiO2)
sedimentary
Quartzite Pebble
Quartzite (SiO2)
metamorphic
Ammonite Fossil
Ammonoidea (primarily composed of Calcite, CaCO3)
sedimentary
Sandstone
Arenite (primarily SiO2)
sedimentary
Glacial Erratic (Sandstone/Quartzite)
Glacial Erratic specimen (likely Orthoquartzite or Feldspathic Sandstone)
sedimentary or metamorphic
Sandstone (Quartzite-rich)
Clastic sedimentary rock (primarily SiO2)
sedimentary
Marble
Recrystallized Calcite (CaCO3)
metamorphic
Fire Opal (in Matrix)
Hydrated Silica (SiO2·nH2O)
mineral
Sandstone (lithic wacke/conglomerate mix)
Clastic Sedimentary Rock (SiO2 with lithic fragments)
sedimentary
Red Sandstone
Arenite (Ferruginous Sandstone)
sedimentary
Sandstone with Manganese Dendrites
Arenite (mostly SiO2) with Manganese Oxide inclusions (MnO2)
sedimentary
Siltstone Pebble
Siltstone
sedimentary
Marble (polished)
Recrystallized Calcite (CaCO3)
metamorphic
Olivine in Basalt
Peridotite / Forsterite ((Mg,Fe)2SiO4)
igneous
Sandstone (likely Quartz Sandstone)
Arenite (composed primarily of SiO2)
sedimentary
Sandstone (likely Fossiliferous)
Arenite / Fossiliferous Sandstone (SiO2 composition)
sedimentary
Geode with Quartz/Chalcedony
Silicon Dioxide (SiO2)
sedimentary
Amazonite
Microcline (KAlSi3O8) with trace lead (Pb)
mineral
Sunstone
(Ca,Na)(Al,Si)4O8 (Oligoclase or Andesine)
mineral
Sandstone
Clastic sedimentary rock (primarily SiO2)
sedimentary
Limestone (Cliff Formation)
Limestone (predominantly CaCO3 as calcite)
Sedimentary
Jasper
Silicon dioxide (SiO2)
sedimentary
Polished quartz-rich pebble, possibly jasper or quartzite
Quartzite or chalcedony-bearing jasper; predominantly SiO₂
metamorphic
Pink-and-white quartz-rich rock, likely rose quartz or quartzite
Quartz (SiO₂), possibly rose-quartz-bearing quartzite; minor iron-oxide staining
metamorphic
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Petrified Wood
Silicified Wood (SiO2)
fossil
Diamond
C (Carbon)
gemstone
Black Granite (Basalt or Gabbro)
Mafic Igneous Rock (primarily Plagioclase and Pyroxene)
igneous
Rose Quartz
SiO2 (Silicon Dioxide)
mineral
Drupa or Druzy Quartz on Geode Fragment
Crystalline Silicon Dioxide (SiO2)
mineral
Sandstone (with manganese staining)
Clastic sedimentary rock (primarily SiO2)
sedimentary
Sandstone (with potential Arkose/Lithic characteristics)
Arenite (Sedimentary rock composed of sand-sized grains)
sedimentary
Chert (Common Opal variant)
Microcrystalline Quartz (SiO2)
sedimentary
Diamond (or Diamond Simulant)
Carbon (C)
gemstone
Diamond
Native Carbon (C)
gemstone
Fossilized Shark Tooth (Anterior/Lateral)
Otodus megalodon or Carcharodon carcharias (fossilized)
fossil
Diamond
Carbon (C)
gemstone
Petrified Wood
Silicified Wood (primarily SiO2)
fossil