Sandstone
Arenite (SiO2 principal composition)
sedimentary
Category
Mineral Side Rock
Browse mineral side rock specimens identified by the Rock Identifier community.
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Sandstone
Arenite (SiO2 primarily)
sedimentary
Biotite (Black Mica)
Biotite - K(Mg,Fe)3AlSi3O10(F,OH)2
mineral
Granite
Felsic intrusive igneous rock
igneous
Quartz (Druzy on Matrix)
Silicon Dioxide (SiO2)
mineral
Sandstone (River Cobble)
Clastic sedimentary rock (primarily SiO2)
sedimentary
Sandstone Cobble with Iron Staining
Arenite with Limonite/Hematite staining
sedimentary
Quartz vein in weathered host rock
Quartz (SiO₂), likely in a weathered metamorphic or igneous matrix
mineral
Felsic Drill Core (likely Gneiss or Granite)
Felsic Metamorphic Rock (Gneissic profile)
metamorphic
Sandstone Pebble
Arenite (SiO2 based)
sedimentary
Sandstone
Clastic sedimentary rock (SiO2 primary)
sedimentary
Sandstone
Arenite (SiO2 principal)
sedimentary
Quartz Geode (likely within Limestone or Dolomite matrix)
Quartz (SiO₂)
Mineral within a Sedimentary Rock
Sandstone (lithic/greywacke variant)
Clastic sedimentary rock (primarily SiO2 with rock fragments)
sedimentary
Banded Sedimentary Rock (Wishbone Stone / Banded Quartzite or Limestone)
Silicified limestone or banded sedimentary rock with mineral veins
sedimentary
Pumice
Pumice (volcanic rock)
Igneous
Rounded gray river pebble, likely basalt or andesite
Fine-grained mafic to intermediate volcanic rock; commonly basalt (plagioclase ± pyroxene/olivine)
igneous
Sandstone
Sedimentary Rock (Quartz arenite/Arkose)
sedimentary
Sandstone with Manganese Staining
Quartz Arenite / Sedimentary Rock
sedimentary
Mixed river-worn rock and mineral collection
Mostly quartz/quartzite, feldspar-bearing granitoid, chert, and mafic volcanic rocks; exact species vary by pebble
igneous, sedimentary, metamorphic, mineral
Sandstone Pebble
Arenite (Sandstone)
sedimentary
Sandstone
Arenite (SiO2 primarily)
sedimentary
Quartz with Mica
Silicon Dioxide (SiO2) with Mica group inclusions
mineral
Sandstone
Sedimentary Rock (Quartz arenite)
sedimentary
Geode (Unopened)
Siliceous Geode (SiO2)
sedimentary
Sandstone
Arenite (primarily SiO2)
sedimentary
Shale
Argillaceous Sedimentary Rock
sedimentary
Quartz-veined Mudstone or Argillite
SiO2 (Quartz) in Siltstone/Mudstone matrix
sedimentary
Mixed Rock Collection (Pebbles and Stones)
Various geological specimens
igneous, sedimentary, and metamorphic
Quartz Geode with Chalcedony
Silicon Dioxide (SiO2) in Geode Form
sedimentary
Sandstone
Clastic Sedimentary Rock
sedimentary
Lapis Lazuli
(Na,Ca)8(AlSiO4)6(SO4,S,Cl)2 (Complex silicate rock)
rock
Quartz-veined Limestone
Sedimentary limestone with quartz/calcite veinlets
sedimentary
Quartz Vein in Host Rock
Silicon Dioxide (SiO2) within metamorphic/igneous matrix
igneous/metamorphic
Gravel and Pebbles
Unconsolidated rock fragments / detrital sediment
sedimentary
Agate (Common Chalcedony)
Silicon Dioxide (SiO2)
mineral
Granite
Phaneritic Felsic Igneous Rock
igneous
Sandstone
Clastic Sedimentary Rock
sedimentary
Sandstone
Arenite
sedimentary
Sandstone
Arenite (SiO2 primarily)
sedimentary
Sandstone
Arenite (SiO2 predominantly)
sedimentary
Quartz geode
Crystalline quartz, silicon dioxide (SiO₂), lining a volcanic geode
mineral