Geode
Quartz nodule / Chalcedony-lined cavity
sedimentary
Category
Not A Rock Or Mineral
Browse not a rock or mineral specimens identified by the Rock Identifier community.
Learn about Not A Rock Or Mineral in the encyclopedia
View all →
Sandstone Pebble with Mineral Encrustation
Quartz Sandstone with Calcite/Halite Crust
sedimentary
Crushed Granite and Basalt
Phaneritic Igneous Rock / Aphanitic Igneous Rock
igneous
Druzy Quartz on Limestone
Silicon Dioxide (SiO2) on Calcium Carbonate (CaCO3)
sedimentary
Sandstone
Arenite
sedimentary
Geode (Quartz / Chalcedony Geode)
SiO2 (Silicon Dioxide)
sedimentary
Quartz Geode
Silicon Dioxide (SiO2)
mineral
Sedimentary Rock (Limestone or Siltstone pebble)
Sedimentary rock fragment
sedimentary
Quartz River Pebble
Silicon Dioxide (SiO2)
mineral
Shale
Laminated Mudstone (Shale)
sedimentary
Quartz with Sericite and Cinnabar
Silicon Dioxide (SiO2) with muscovite/sericite and mercury sulfide (HgS)
mineral
Vesicular Basalt
Vesicular Basalt
igneous
Granite Pebbles
Granite (composed primarily of Quartz SiO2, Feldspar (KAlSi3O8 – NaAlSi3O8 – CaAl2Si2O8), and Mica)
igneous
Pebble
Clast (specifically a granule or small pebble)
Sedimentary
Sandstone
Clastic sedimentary rock (primarily SiO2)
sedimentary
Granite
Phaneritic plutonic rock (primarily Quartz, Feldspar, and Mica)
igneous
Agate Geode
Silicon Dioxide (SiO2) - Chalcedony variety
sedimentary
Sandstone with Iron Banding
Arenite with Hematite or Limonite staining (SiO2 with Fe2O3)
sedimentary
Desert Rose
Gypsum (CaSO4·2H2O) or Barite (BaSO4)
mineral
Copper Ore (Malachite and Azurite stained rock)
Copper-bearing rock with secondary copper carbonates
mineral
Granite
Felsic intrusive igneous rock
igneous
Quartz Vein in Metamorphic Rock
Quartz-veined Schist or Gneiss
metamorphic
Serpentinite
Serpentinite (composed primarily of Serpentine group minerals (Mg,Fe,Ni,Al,Zn,Mn)2-3(Si,Al,Fe)2O5(OH)4)
metamorphic
Gravel or Crushed Stone
Fragmented Aggregate Stone
sedimentary or igneous fragment
Weathered granite or granitic gneiss
Granite: quartz, feldspar, and mica; possibly gneiss if the dark minerals are banded
igneous
Quartz with Mafic/Chlorite Veins
Silicon Dioxide (SiO2) with Chlorite/Epidote cross-veining
metamorphic
Gravel and Sediment Sample
Mixed clastic sediment
sedimentary
Gravel
Unconsolidated rock fragments / detrital sediment
sedimentary
Basalt with Quartz Vein
Extrusive Igneous Rock / Volcanic Rock
igneous
Mixed Rock Collection (Pebbles and Stones)
Various geological specimens
igneous, sedimentary, and metamorphic
Desert Rose (Baryte or Selenite variant)
Barium Sulfate (BaSO4) or Gypsum (CaSO4·2H2O) with Sand inclusions
mineral
Granite
Felsic intrusive igneous rock
igneous
Veined Quartzite / Vein-filled Sedimentary Rock
Siliciclastic rock with iron oxide-filled fractures
sedimentary
Quartzite with Schist layers
Metamorphosed Quartz-rich Rock (Mixed Schist/Quartzite)
metamorphic
Granite Pebble
Intrusive Igneous Rock
igneous
Vuggy Quartz on Matrix
Crystalline Silicon Dioxide (SiO2)
mineral
Wishing Stone (Quartz Vein in Greywacke / Basalt)
Quartz vein in host rock (e.g. Meta-basalt or Greywacke)
metamorphic
Geode
Quartz / Chalcedony nodule
sedimentary
Quartz Geode
Silicon dioxide (SiO2)
sedimentary
Yellow Agate (Banded Chalcedony)
Silicon Dioxide (SiO2)
sedimentary
Generic Pebble
Lithic Fragment
sedimentary
Sandstone and Conglomerate pebbles
Sedimentary clastic rock
sedimentary