Concrete Fragment
Hardened Portland Cement Composite
Anthropogenic (Man-made material mimicking sedimentary rock)
Category
This Is Not A Rock Or Mineral
Browse this is not a rock or mineral specimens identified by the Rock Identifier community.
Granite
Intrusive Phaneritic Felsic Igneous Rock
igneous
Petrified Wood
Silicified Wood (primarily SiO2)
sedimentary
Quartz Pebble (with Iron Inclusions)
Silicon Dioxide (SiO2)
mineral
Druzy Agate (Star-cut Geode Slice)
Silicon Dioxide (SiO2) - Microcrystalline and Macrocrystalline Quartz
mineral
Ocean Jasper
Orbicular Jasper (SiO2)
mineral
Rose Quartz
Silicon Dioxide (SiO2) with trace amounts of titanium, iron, or manganese
mineral
Agate (Chalcedony)
Cryptocrystalline Silica or Silicon Dioxide (SiO2)
mineral
Diorite
Plutonic Igneous Rock (Intermediate Composition)
Igneous
Granite
Granite (Phaneritic intrusive igneous rock)
igneous
Amygdaloidal Rhyolite
Amygdaloidal Rhyolite (Felsic volcanic rock)
igneous
Conglomerate
Clastic sedimentary rock (Conglomerate)
sedimentary
Sandstone (Micaceous/Feldspathic variant)
Arenite (specifically subarkose or lithic arenite)
sedimentary
Sandstone (with Liesegang rings or Oxidation)
Arenite (primarily Quartz SiO2 with Iron Oxide Fe2O3 staining)
sedimentary
Banded Gneiss
Gneiss (High-grade Regional Metamorphic Rock)
metamorphic
Greywacke (River Slikkenstone)
Greywacke (Impure Sandstone)
sedimentary
Lapis Lazuli
Lazurite-dominant rock, (Na,Ca)8(AlSiO4)6(SO4,S,Cl)2
metamorphic
Dalmatian Stone (commonly called Dalmatian Jasper)
Peralkaline Rock (mixed Feldspar, Quartz, and Arfvedsonite)
igneous
Grey River Stone (Quartz-rich Quartzite/Siltstone)
Quartzite / Meta-siltstone (primarily SiO2)
Metamorphic (low-grade)
River Stone (likely Mudstone or Siltstone)
Lutite (Clastic sedimentary rock composed of clay and silt-sized particles)
sedimentary
Basalt
Basalt
igneous
Petrified Wood
Silicified wood (primarily Silicon Dioxide - SiO2)
metamorphic
Quartz / Quartzite
Silicon Dioxide (SiO2)
metamorphic
Schist (Garnet-Mica Schist)
Garnet-Mica Schist (X-Y)3Z2(SiO4)3
metamorphic
Snowflake Obsidian
Volcanic Glass with Cristobalite inclusions
igneous
Green Aventurine
Silicon Dioxide (SiO2) with Fuchsite inclusions
metamorphic
Granite (tumbled pebble)
Granite (Plutonic Igneous Rock)
Igneous Rock
Quartz / Calcite Vein Rock
Silicon Dioxide (SiO2) or Calcium Carbonate (CaCO3)
mineral
Ruby in Zoisite
Ruby (Corundum, Al2O3) in Zoisite (Calcium aluminum silicate hydroxide, Ca2Al3(SiO4)3(OH)) with some Hornblende
Metamorphic Rock (specifically a rock composed of minerals)
Granite
Granite (Felsic Plutonic Rock)
igneous
Sandstone (Water-worn Pebble)
Clastic Sedimentary Rock (primarily SiO2)
sedimentary
Quartz (Double-Terminated)
Silicon Dioxide (SiO2)
mineral
Agate (specifically Carnelian or Honey Agate)
Silicon Dioxide (SiO2)
Mineral
Red Sandstone
Arenite (with Iron Oxide cement)
sedimentary
Basalt
Basalt (Aphanitic Mafic Igneous Rock)
igneous
Rough Dark Green Sapphire
Corundum (Al2O3)
mineral
Quartz on Host Rock
Silicon Dioxide (SiO2)
Mineral Specimen
Lunar Meteorite (Feldspathic Breccia)
Achondrite, Lunar Meteorite (Feldspathic Breccia)
igneous
Aventurine
Silicon Dioxide (SiO2) with Fuchsite inclusions
metamorphic
Sandstone (Quartzose)
Arenite (composed primarily of SiO2)
sedimentary
Unknown Rock Specimen
igneous
Orange Quartzite (River Pebble)
Quartzite (SiO2 with iron oxide inclusions)
metamorphic