Sandstone (with Iron Staining)
Clastic sedimentary rock (primarily SiO2 with Fe2O3 staining)
sedimentary
Category
Man Made Rock (Technosol)
Browse man made rock (technosol) specimens identified by the Rock Identifier community.
Tiger's Eye
Pseudomorph of Quartz after Crocidolite (SiO2 with iron oxide inclusions)
metamorphic
Quartzite Pebble (River Rock)
Quartzite (mainly SiO2)
metamorphic
Sandstone (Quartzose Sandstone)
Clastic Terrigenous Sedimentary Rock (primarily SiO2)
sedimentary
Scoria (with likely iron oxidation)
Scoria (Basaltic Scoria)
igneous
Yellow Jasper
Silicon Dioxide (SiO2) - Impure Cryptocrystalline Quartz
sedimentary
Snowflake Obsidian
Spherulitic Volcanic Glass (primarily SiO2 with Cristobalite inclusions)
igneous
Rose Quartz
Silicon Dioxide (SiO2) with trace amounts of titanium, iron, or manganese
mineral
Jasper (Yellow/Brown variety)
Silicon Dioxide (SiO2) - Microcrystalline Quartz
sedimentary
Sandstone
Arenite
sedimentary
Granite Cobble
Plutonic Igneous Rock (Granitic)
igneous
Sandstone (clastic)
Clastic Sedimentary Rock (primarily composed of SiO2)
sedimentary
Vesicular Basalt (or Scoria)
Vesicular Basalt
igneous
Chert (Common Opal/Agate mixture)
Microcrystalline Quartz (SiO2)
sedimentary
Tiger's Eye (Rough)
Pseudomorph of Quartz after Crocidolite (SiO2)
mineral
Agate Geode / Nodular Chalcedony
Silicon Dioxide (SiO2) with impurities
mineral
Gastropod Steinkern (Internal Mold Fossil)
Gastropoda (Class); Internal mold or 'Steinkern' composed of Calcium Carbonate (CaCO3) or Sedimentary matrix
sedimentary
Jasper
Silicon dioxide (SiO2) with iron oxide inclusions
sedimentary
Jasper
Jasper (Silicon Dioxide, SiO2)
sedimentary
Basalt Scoria
Vesicular Basalt
igneous
Moss Agate
Silicon Dioxide (SiO2) with inclusions
mineral
Quartz (Milky/Common Quartz)
Silicon Dioxide (SiO2)
mineral
Quartz Geode
Silicon Dioxide (SiO2)
mineral
Quartz on Greenstone
Silicon Dioxide (SiO2) on Altered Igneous Geologic Unit
metamorphic
Sandstone
Arenite (SiO2 primarily)
sedimentary
Basalt (Polished River Stone)
Mafic Volcanic Rock (primarily Plagioclase and Pyroxene)
Igneous
Quartzite with Iron Inclusions
Metamorphic Quartzite (SiO2 with Fe2O3 trace impurities)
metamorphic
Red Sandstone
Arenite (with Iron Oxide / Hematite cementation)
sedimentary
Mudstone
Lutylite (group of fine-grained sedimentary rocks)
sedimentary
Eclogite
Eclogite (Pyrope garnet and Omphacite pyroxene)
metamorphic
Sandstone (likely Quartzose Sandstone)
Arenite (SiO2 predominantly)
sedimentary
Ocherous Sandstone (Ferruginous Sandstone)
Ferruginous Arenite (SiO2 with Fe2O3)
sedimentary
Quartz Geode
Silicon Dioxide (SiO2) within a geode
sedimentary
Sandstone
Arenite (primarily SiO2 - Silicon Dioxide)
sedimentary
Ferruginous Sandstone (with possible Epidote/Chlorite coloring)
Sandstone (SiO2 dominated with Fe2O3 staining)
sedimentary
Stream Pebble (Basalt/Greywacke)
Mafic Igneous Rock (Fine-grained)
igneous
Ferruginous Sandstone
Arenite with Iron-Oxide cement (primarily Fe2O3 • nH2O)
sedimentary
Serpentinite (Serpentine Rock)
Primarily composed of serpentine group minerals, such as antigorite, chrysotile, and lizardite. Chemical formula for serpentine minerals is (Mg,Fe)3Si2O5(OH)4.
Metamorphic
Basalt with Iron Oxidation
Mafic Igneous Rock (Basalt)
igneous
Basalt
Mafic Extrusive Igneous Rock
Igneous
Basalt (River Cobble)
Basalt (Mafic volcanic rock)
igneous
Basalt
Extrusive mafic igneous rock
igneous