Unknown Rock Fragment
Undetermined
igneous
Category
Not A Natural Rock
Browse not a natural rock specimens identified by the Rock Identifier community.
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Opalite (Synthetic Moonstone/Sea Opal)
Silicon Dioxide (SiO2) glass with metallic inclusions
Synthetic/Man-made Glass
Sandstone
Sedimentary Rock (Quartz Sandstone)
sedimentary
Blue Chalcedony (likely dyed Agate)
Silicon Dioxide (SiO₂)
mineral
Hag Stone (Odin Stone / Adder Stone)
Perforated Pebble (commonly Chert, Mudstone, or Limestone)
sedimentary
Slate
Foliated metamorphic rock
metamorphic
Sandstone
Arenite (Clastic Sedimentary Rock)
sedimentary
Limonite (Ironstone)
Limonite (FeO(OH)·nH2O)
mineral
Sandstone (with Rock Art)
Sandstone (Clastic Sedimentary Rock)
sedimentary
Shale (Beach-worn)
Laminated Pelite (primarily clay minerals and quartz)
sedimentary
Limonite (Yellow Ochre)
FeO(OH)·nH2O (Hydrous iron(III) oxide-hydroxide mixture)
Mineral (Iron Ore)
Limonite
Hydrous ferric oxides (FeO(OH)·nH2O)
sedimentary
Brecciated Jasper
Silicon Dioxide (SiO2) with iron oxide inclusions
sedimentary
Sandstone (with potentially high Feldspar/Arkose content)
Clastic sedimentary rock (SiO2 dominated)
sedimentary
Agate
Silicon dioxide (Chalcedony), SiO2
sedimentary
Shale fragment
Shale (clay mineral rich sedimentary rock)
sedimentary
Limonite (Iron Ore)
Limonite (Hydrous iron(III) oxide-hydroxide mixture, FeO(OH)·nH2O)
mineral
Quartzite Pebble (Stream-rounded Quartz/Quartzite Gravel)
Quartzite / Silicon Dioxide (SiO2)
metamorphic
River Cobble (Basaltic/Andesitic)
Mafic to Intermediate Volcanic Rock
igneous
Sandstone
Sedimentary Rock (Quartz Sandstone)
sedimentary
Sandstone
Sedimentary rock composed mainly of sand-sized minerals or rock grains
sedimentary
Sandstone
Arenite
sedimentary
Quartzite (Engineered Stone)
Silicon Dioxide (SiO2) based synthetic composite
metamorphic
Mahogany Obsidian
Obsidian (Volcanic Glass) with Hematite or Magnetite inclusions, SiO2 (Silicon Dioxide)
igneous
Banded Sedimentary Rock (Wishbone Stone / Banded Quartzite or Limestone)
Silicified limestone or banded sedimentary rock with mineral veins
sedimentary
Sandstone
Clastic Sedimentary Rock
sedimentary
Dyed Dragon Vein Agate
Silicon Dioxide (SiO2) with artificial pigment
mineral
Sandstone
Sandstone (Arenite)
sedimentary
Sandstone (likely Conglomerate or Gritstone)
Arenite (SiO2 based)
sedimentary
Generic Rock Fragment
Rock Fragment
sedimentary
Vesicular Basalt (Lava Rock)
Basalt
igneous
Banded Sedimentary Rock
Stratified Siliciclastic / Arenite or Siltstone with Mineral Bands
sedimentary
Quartz Pebble
Silicon Dioxide (SiO2)
sedimentary
Granite Pebble
Intrusive Igneous Rock
igneous
Fossiliferous Limestone with Crinoid Stem
Sedimentary Rock with Echinodermata fossil fragment
fossil
Agate (Water-Worn)
Cryptocrystalline quartz (SiO2)
sedimentary
Dragon Vein Agate (Dyed)
SiO2
mineral
Sandstone
Arenite (Siliclastic sedimentary rock)
sedimentary
Dyed Quartzite
Metamorphosed Quartz (SiO2) with synthetic pigment
metamorphic
Generic Rock / Pebble
Undetermined rock specimen
sedimentary
Hag Stone
Perforated Sedimentary Rock (typically Flint, Chert, or Limestone)
sedimentary
Gravel and Sand Aggregate
Unconsolidated Clastic Sediment
sedimentary