River Stone (composed of Siltstone/Basalt mixture)
Siltstone or microcrystalline Basalt pebble
sedimentary
Category
Not A Rock
Browse not a rock specimens identified by the Rock Identifier community.
Learn about Not A Rock in the encyclopedia
View all →
Jasper
Silicon dioxide (SiO2)
sedimentary
Milky Quartz Pebble
Crystalline Quartz (SiO2)
mineral
Ferruginous Sandstone
Arenite with Hematite/Limonite cement
sedimentary
Quartz Geode
Silicon Dioxide (SiO2)
sedimentary
Milky Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Coquina or Coral Fossil
Biogenic Limestone (Calcite/Aragonite)
sedimentary
Agate (Chalcedony)
Silicon Dioxide (SiO2)
mineral
Chert (Jasper variation)
Silicon Dioxide (SiO2)
sedimentary
Slag
Anthropogenic Vitreous Silica/Iron oxides
mineral-like byproduct
Red Jasper
Silicon dioxide (SiO2) with iron inclusions
sedimentary
Unakite Granite
Epidotized Granite
metamorphic
Jasper with Quartz inclusions
Silicon Dioxide (SiO2) with impurities
sedimentary
Sandstone
Arenite (primarily SiO2)
sedimentary
Mixed Tumbled Gemstones and River Rocks
Mixed Decorative Stones (predominantly Silicon Dioxide - SiO2 variants)
Mixed (Igneous, Sedimentary, Metamorphic, and Minerals)
Rose Quartz
Silicon Dioxide (SiO2)
mineral
Jasper with Quartz Veining
Silicon Dioxide (SiO2) - Opaque cryptocrystalline variety of Quartz
sedimentary
Quartzite Cobble
Meta-quartzite (90%+ SiO2)
metamorphic
Milky Quartz with Iron Staining
Quartz (Silicon Dioxide, SiO2)
mineral
Sandstone (with Lichen)
Arenite (composed primarily of SiO2)
sedimentary
River Pebbles and Quartz
Mixed Igneous, Sedimentary, and Metamorphic Rocks (Silicon Dioxide SiO2 dominant)
mixed
Quartzite Pebble (River Rock)
Quartzite (mainly SiO2)
metamorphic
Red Jasper
Silicon Dioxide (SiO2)
sedimentary
Tiger's Eye
Pseudomorph of Quartz after Crocidolite (SiO2 with iron oxide inclusions)
metamorphic
Scoria (with likely iron oxidation)
Scoria (Basaltic Scoria)
igneous
Sandstone (Quartzose Sandstone)
Clastic Terrigenous Sedimentary Rock (primarily SiO2)
sedimentary
Sandstone (with Iron Staining)
Clastic sedimentary rock (SiO2 with Fe2O3 impurities)
sedimentary
Sandstone
Arenite (SiO2 primarily)
sedimentary
Sandstone (with Iron Staining)
Clastic sedimentary rock (primarily SiO2 with Fe2O3 staining)
sedimentary
Sandstone
Arenite (composed primarily of SiO2)
sedimentary
Sandstone (Weathered)
Arenite (primarily SiO2)
sedimentary
Sandstone
Arenite
sedimentary
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
Sandstone (Quartz-rich)
Arenite (composed mainly of SiO2)
sedimentary
Quartz Vein in Host Rock (Gabbro or Basalt)
Silicon Dioxide (SiO2) with Mafic Silicates
metamorphic/igneous
Jasper (Yellow/Brown variety)
Silicon Dioxide (SiO2) - Microcrystalline Quartz
sedimentary
Sandstone
Arenite (SiO2 primarily)
sedimentary
Granite Cobble
Plutonic Igneous Rock (Granitic)
igneous
Sandstone (likely Arkose or Quartz Sandstone)
Arenite (SiO2 + varied clasts)
sedimentary
Sandstone (Quartzose)
Arenite (primarily SiO2)
sedimentary