Geode (Quartz / Chalcedony Geode)
SiO2 (Silicon Dioxide)
sedimentary
Category
Rock
Browse rock specimens identified by the Rock Identifier community.
Quartzite Pebble (River Rock)
Metamorphic Quartzite (SiO2)
metamorphic
Quartzite Pebble
Quartzite (mostly SiO2)
metamorphic
Quartz Geode
Silicon Dioxide (SiO2)
mineral
Sandstone
Arenite
Sedimentary
Red Jasper (Beach Pebble)
SiO2 (Microcrystalline Quartz with Hematite inclusions)
sedimentary
Sandstone
Clastic sedimentary rock (primarily SiO2)
sedimentary
Pebble (likely a type of sandstone or quartzite pebble)
Clastic Sediment (specifically, a rudite-sized clast). If the pebble is composed of a specific rock type, its scientific name would be that rock type (e.g., 'Quartzite pebble', 'Granite pebble', 'Chert pebble'). Given its appearance, it is likely a metamorphic quartzite pebble or a hard sandstone pebble.
Sedimentary rock
Vesicular Basalt (Lava Rock)
Vesicular Basalt
igneous
Agate Geode
Silicon Dioxide (SiO2) - Chalcedony variety
sedimentary
Shale / Mudstone
Laminated Mudrock (Siliciclastic Sedimentary Rock)
sedimentary
Serpentinite
Serpentinite (Mg, Fe, Ni, Al, Zn, Mn)2-3(Si, Al, Fe)2O5(OH)4
metamorphic
Vesicular Basalt (or Scoria)
Vesicular Basalt
igneous
Basalt
Basalt
igneous
Gneiss
High-grade regional metamorphic rock (Foliated)
metamorphic
Granite
Granite (Phaneritic intrusive igneous rock)
igneous
Basalt
Basalt
igneous
Shale (Beach-worn)
Laminated Pelite (primarily clay minerals and quartz)
sedimentary
Quartz Geode (likely within Limestone or Dolomite matrix)
Quartz (SiO₂)
Mineral within a Sedimentary Rock
Unidentified Rock Fragment
Unknown
Rock
Gravel or Crushed Stone
Fragmented Aggregate Stone
sedimentary or igneous fragment
Quartzite (Yellow/Orange variety)
Quartzite (primarily SiO2)
metamorphic
Basalt with Weathering Rind
Basalt (Mafic Volcanic Rock)
igneous
Desert Rose (Gypsum Rose)
Calcium Sulfate Dihydrate (CaSO4·2H2O)
mineral
Painted River Rock
Painted Quartzite or Smooth Siltstone
sedimentary
Basalt
Mafic extrusive igneous rock
igneous
Clear Quartz (Cut/Faceted Gemstone)
Silicon Dioxide (SiO2)
gemstone
Basalt with Alteration Crust
Basalt (SiO2 range 45-52%)
igneous
Leopard Skin Jasper
Orbicular Jasper (Silicon Dioxide, SiO2)
sedimentary
Basalt
Mafic Igneous Rock (composed primarily of plagioclase feldspar and pyroxene)
Igneous
Basalt
Basalt (Mafic volcanic rock)
igneous
Basalt River Cobble
Basalt (Mafic volcanic rock)
igneous
Basalt Cobble
Aphanitic Mafic Igneous Rock (Basalt)
igneous
Milky Quartz with Chlorite Schist Inclusions
Quartz (SiO2) with Chlorite Group silicates (typically (Mg,Fe)3(Si,Al)4O10(OH)2)
metamorphic
Granite
Phaneritic Igneous Rock (primarily Quartz, Feldspar, Mica)
igneous
Unknown Tumbled Stone
Unknown (Too Blurry)
mineral
River Pebble (likely Quartzite or Siltstone)
Sedimentary Clast (SiO2 based)
sedimentary
Desert Varnish on Sandstone
Ferromanganese coating on Quartz Arenite
sedimentary
Quartz Druzy (Geode Fragment)
Silicon Dioxide (SiO2)
mineral
Granite
Granite
Igneous
Quartz Geode
Silicon Dioxide (SiO2) within a sedimentary or volcanic shell
mineral
Quartz Geode
Silicon Dioxide (SiO2)
mineral