Sandstone (likely Ferruginous)
Arenite with Iron Oxide cement
sedimentary
Category
Synthetic (Not A Natural Rock)
Browse synthetic (not a natural rock) specimens identified by the Rock Identifier community.
Learn about Synthetic (Not A Natural Rock) in the encyclopedia
View all →
Smoky Quartz
Silicon Dioxide (SiO2) with aluminum impurities
mineral
Sandstone (Weathered)
Arenite (primarily SiO2)
sedimentary
Vein Quartz in Basalt or Chert
Silica-veined dark lithic rock (Quartz veins in microcrystalline matrix)
sedimentary
Red Quartzite / River Siltstone
Quartzite (SiO2 with iron oxide inclusions)
metamorphic
Turquoise
CuAl6(PO4)4(OH)8·4H2O
mineral
Vesicular Limestone with Borings
Fossiliferous Calcarenite (Calcium Carbonate, CaCO3)
sedimentary
Sandstone with Iron Oxide Coating
Arenite (SiO2 with Fe2O3 impurities)
sedimentary
Waterworn Pebble / Quartzite
Metamorphic/Sedimentary rock fragment
sedimentary
Granite
Granite
igneous
Citrine Quartz
Citrine (Silicon Dioxide - SiO2)
Mineral
Sandstone (Pebble)
Arenite (SiO2 based)
sedimentary
Sandstone
Arenite (SiO2 primarily)
sedimentary
Pumice
Pumice (Highly vesicular volcanic glass)
igneous
Pumice
Pumice (a highly vesicular volcanic glass)
igneous
Banded Gneiss
Gneiss (High-grade regional metamorphic rock)
metamorphic
River Pebble
Siliceous rock fragment / Quartzite / Sandstone pebble
sedimentary
Bivalve Shell (Fossil or Contemporary)
Class Bivalvie (various genera and species of clams, cockles, etc.)
Sedimentary (Biogenic sediment or biological remain)
![Lapis Lazuli (Lapis Lazuli (a rock composed primarily of Lazurite (Na,Ca)₈[(S,Cl,SO₄,OH)₂|(Al₆Si₆O₂₄)], with varying amounts of Calcite, Pyrite, and Sodalite.)) — Mineral](https://media.rockidentification.com/ac5a19c1-d5b9-4c2e-8fab-285264802654-thumbnail.jpg)
Lapis Lazuli
Lapis Lazuli (a rock composed primarily of Lazurite (Na,Ca)₈[(S,Cl,SO₄,OH)₂|(Al₆Si₆O₂₄)], with varying amounts of Calcite, Pyrite, and Sodalite.)
Mineral
Quartzite
Quartzite (SiO2)
metamorphic
River Pebbles / Mudstone
Sedimentary Rock / Silty Claystone
sedimentary
Granite
Phaneritic Felsic Igneous Rock (Granite)
igneous
Conglomerate
Clastic sedimentary rock (Conglomerate)
sedimentary
Conglomerate
Clastic Sedimentary Rock (Conglomerate)
sedimentary
Conglomerate
Conglomerate (clastic sedimentary rock)
sedimentary
Banded Agate (specifically Botswana Agate or Water-line Agate)
Chalcedony (cryptocrystalline variety of Quartz), SiO2
mineral
Giallo Ornamental Granite
Phaneritic Igneous Rock (composed of Quartz, Feldspar, and Mica)
igneous
Quartz (Milky or Smoky Quartz Pebble)
Silicon Dioxide (SiO2)
mineral
Sandstone
Arenite (SiO2 principal)
sedimentary
Brown Sandstone
Arenite (primarily Quartz and Feldspar, with Iron Oxide cement)
sedimentary
Limestone with Lichen
Calcium Carbonate (CaCO3) with Endolithic/Epilithic Lichen
sedimentary
Dragon Vein Agate
Silicon Dioxide (SiO2)
mineral
Banded Slate
Slate (Metamorphosed Siltstone/Mudstone)
metamorphic
Vesicular Basalt River Rock
Vesicular Basalt
igneous
Sandstone
Arenite (SiO2 based typically)
sedimentary
River Pebble (Greywacke / Basalt Pebble)
Indeterminate Rounded Pebble (composed of quartz, feldspar, or mafic minerals)
sedimentary
Shale
Fissile mudstone (rich in clay minerals and quartz)
sedimentary
Granite Boulder
Felsic Intrusive Igneous Rock
igneous
Granite
Phaneritic Plutonic Felsic Rock
igneous
Granite
Phaneritic Plutonic Felsic Rock
igneous
Conglomerate
Conglomerate (clastic sedimentary rock)
sedimentary
Basalt River Stone
Basalt
igneous