Carnelian Agate
Silicon Dioxide (SiO2) with iron oxide impurities
mineral
Category
Man Made (Synthetic Rock)
Browse man made (synthetic rock) specimens identified by the Rock Identifier community.
Sandstone
Arenite (composed primarily of SiO2)
sedimentary
Graveler (Fictional Interpretation)
Mons calcarius anthropomorphus
igneous
Carnelian Agate
Silicon Dioxide (SiO2) - variety of Chalcedony
mineral
Gneiss
Gneiss
metamorphic
Pink Granite / Gneiss
Felsic Plutonic Rock (Granite) with Gneissic banding
igneous / metamorphic
Sandstone (Greywacke/Siltstone variant)
Clastic Sedimentary Rock (composed primarily of Quartz SiO2 and Feldspar)
sedimentary
Brachiopod Fossil (Spiriferid)
Phylum Brachiopoda, Order Spiriferida (CaCO3 - Calcium Carbonate)
sedimentary (fossilized organic remains)
Pink Granite
Phaneritic Felsic Igneous Rock (composed primarily of K-Feldspar, Quartz, and Mica)
igneous
Milky Quartz (among River Rock)
Quartz (Silicon Dioxide, SiO2)
Mineral
Jasper (with Agate/Chalcedony inclusions)
Silicon Dioxide (SiO2)
sedimentary
Tree Agate
Silicon Dioxide (SiO2) - Dendritic Agate/Chalcedony
sedimentary
Rose Quartz
Silicon Dioxide (SiO2) with trace amounts of titanium, iron, or manganese
mineral
Granite
Plutonic felsic igneous rock
igneous
Jasper
Silicon dioxide / Chalcedony (SiO2)
Sedimentary
Jasper
Silicon dioxide (SiO2)
sedimentary
River Stone (likely Quartzite or Chert)
Recrystallized Silicon Dioxide (SiO2)
metamorphic
Tiger's Eye
SiO2 (Silicon Dioxide with inclusions of Goethite/Limonite)
Metamorphic
Jasper (Red/Yellow)
Silicon Dioxide (SiO2) with impurities
sedimentary
Tiger's Eye (likely Hawk's Eye variant)
Pseudomorph of Quartz after Crocidolite (SiO2)
metamorphic
Chert (Jasper/Chalcedony variety)
Microcrystalline Quartz (SiO2)
sedimentary
Rose Quartz
Silicon Dioxide (SiO2) with trace amounts of Titanium, Iron, or Manganese
mineral
Tiger's Eye
Pseudomorph of Quartz after Crocidolite (SiO2 with inclusions of Iron Oxide)
metamorphic
Yellow Jasper
Jasper (Silicon Dioxide, SiO2)
sedimentary
Red Jasper
Silicon Dioxide (SiO2) with Iron Oxide (Fe2O3) inclusions
sedimentary
Gneiss (specifically a Banded Gneiss cobble)
Gneiss (composed mainly of Quartz, Feldspar, and Biotite/Amphibole)
metamorphic
Jasper
Jasper (Silicon Dioxide, SiO2 plus iron oxide impurities)
sedimentary
Devil's Toenail
Gryphaea (extinct genus of foam oysters, typically composed of Calcite CaCO3)
sedimentary
Moss Agate
Silicon Dioxide (SiO2) with inclusions of Manganese or Iron oxide
mineral
Riverstone (Quartzite or Siltstone cobble)
Quartzite (primarily SiO2)
metamorphic
Clear Quartz (Rock Crystal)
Quartz (Silicon Dioxide, SiO2)
mineral
River Chalcedony / Agate
Chalcedony (Silicon Dioxide, SiO2)
mineral
Basalt (River Pebble)
Basalt (dominated by Plagioclase Feldspar and Pyroxene)
igneous
Ferruginous Sandstone
Arenite with Hematite/Limonite cement
sedimentary
Conglomerate
Conglomerate (clastic sedimentary rock)
sedimentary
Diabase (Dolerite) Cobble
Diabase / Dolerite
igneous
Turquoise
Hydrated phosphate of copper and aluminium, CuAl6(PO4)4(OH)8·4H2O
mineral
Sandstone
Arenite (SiO2 based with mineral cement)
sedimentary
Sandstone (Ferruginous)
Arenite (Fe-rich)
sedimentary
Vesicular Basalt (Lava Rock)
Aphanitic Mafic Igneous Rock
igneous
Porphyritic Basalt (Leopard Rock)
Porphyritic Mafic Volcanic Rock
igneous
Scoria (Red Lava Rock)
Scoria (Vesicular basaltic rock)
Igneous