Geode with Quartz and possibly Jasper/Hematite
Quartz (SiO2) and Chalcedony (cryptocrystalline SiO2), possibly stained by iron oxides
Mineral/Sedimentary Geode
Category
Rock
Browse rock specimens identified by the Rock Identifier community.
Granite and Basalt Specimen
Plutonic and Volcanic Igneous Rocks
igneous
Granite
Felsic intrusive igneous rock
igneous
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Chert (Flint flake / debitage)
Microcrystalline / Cryptocrystalline Quartz (SiO2)
sedimentary
Vein Quartz in Basalt
Silicate-veined volcanic rock
igneous
Latite
Latite porphyry
igneous
Granite Cobble
Phaneritic Felsic Igneous Rock
igneous
Granite
Felsic intrusive igneous rock
igneous
Granite
Felsic intrusive igneous rock
igneous
Calcite (or Travertine / Limestone)
Calcium Carbonate (CaCO3)
sedimentary
Diorite
Intermediate plutonic igneous rock
igneous
Granite
Granite (composed primarily of Quartz SiO2, Potassium Feldspar KAlSi3O8, and Plagioclase)
igneous
Banded Iron Formation (Fragment)
Banded Iron Formation (BIF)
sedimentary
Quartzite
Metamorphic Quartzite (SiO2)
metamorphic
Sandstone
Clastic sedimentary rock (Quartz arenite or arkose)
sedimentary
Basalt
Basalt (Mafic volcanic rock)
igneous
Granodiorite (Weathered)
Granodiorite
igneous
Likely quartz-rich granite or granitic pegmatite
Granite, composed chiefly of quartz (SiO₂), feldspar, and mica; identification from the image is approximate
igneous
Weathered granitic cobble
Granitoid, likely granite or granodiorite
igneous
Weathered granite or granitic gneiss
Granite; predominantly quartz, feldspar, and mica (exact identification is uncertain from the image)
igneous
Granite-like igneous rock
Likely medium-grained granite or granodiorite; quartz–feldspar–mica aggregate
igneous
Iron-stained milky quartz vein
Quartz (SiO₂), with reddish iron-oxide staining, likely hematite or goethite
mineral
Granite
Granite, a coarse-grained felsic intrusive igneous rock composed chiefly of quartz, feldspar, and mica or amphibole
igneous
Rounded dark cobble in gravel
Likely mafic volcanic rock, such as basalt or diabase; exact identification is uncertain from the image
igneous
Granite
Granite
igneous
Basalt
Extrusive igneous rock
igneous
Basalt with inclusion
Basalt (Aphanitic-Porphyritic texture)
igneous
Basalt with Scoria
Amygdaloidal Basalt / Vesicular Basalt
igneous
Druzy Quartz on Chert/Chalcedony
Silicon Dioxide (SiO2)
mineral
Asphalt Chunk (with aggregate)
Bituminous concrete / Anthropogenic conglomerate
sedimentary (anthropogenic/man-made conglomerate)
Basalt (River Rock)
Basalt
igneous
Vesicular Basalt (Scoria)
Basalt with vesicular texture
igneous
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Granite
Felsic intrusive igneous rock
igneous
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Quartzite
Metamorphic Quartzite (SiO2)
metamorphic
Granite or Granitic Gneiss River Rock
Granite
igneous
Granite
Felsic intrusive igneous rock
igneous
Granite
Intrusive igneous rock composed mostly of quartz, alkali feldspar, and plagioclase
igneous
Granite
Felsic intrusive igneous rock
igneous