Smoky Quartz and Chalcedony Geode Fragment
Silicon Dioxide (SiO2)
Category
Browse not a rock specimens identified by the Rock Identifier community.
Smoky Quartz and Chalcedony Geode Fragment
Silicon Dioxide (SiO2)
Shale or Slaty Mudstone
Argillaceous sedimentary rock
Sandstone
Arenite (SiO2 dominant)
Lapis Lazuli
Lapis Lazuli (a rock type, not a single mineral, composed primarily of lazurite, calcite, and pyrite)
Garnet Schist
Garnetiferous Micaceous Schist
Basalt
Extrusive mafic igneous rock
Chert (Jasper/Flint Pebble)
Microcrystalline quartz (SiO2)
Quartz Vein in Host Rock
Silicon Dioxide (SiO2) within metamorphic/igneous matrix
Painted River Pebble (likely Basalt or Greywacke)
Aphanitic Lithic Clast with Anthropogenic Pigment coating
Basalt Cobble
Vesicular Basalt (Mafic Extrusive)
Granodiorite
Granodiorite
Metaconglomerate
Metaconglomerate (Quartzite conglomerate)
Vesicular Basalt (Pumice-like)
Vesicular Basalt
Granodiorite
Granodiorite (containing Plagioclase, Quartz, and Biotite)
Serpentine
Serpentinite (Mg, Fe, Ni, Al, Zn, Mn)2-3(Si, Al, Fe)2O5(OH)4
Pink Granite
Phaneritic Felsic Intrusive Igneous Rock
Desert Rose (Baryte or Selenite variant)
Barium Sulfate (BaSO4) or Gypsum (CaSO4·2H2O) with Sand inclusions
River Rock / Stream Pebble
Fluvial Clast / Rounded Sedimentary Particle
Sandstone
Clastic sedimentary rock (primarily SiO2)
Yellow Quartzite (River Pebble)
Quartzite (SiO2)
Granodiorite (Gneissic texture)
Granodiorite (containing Quartz SiO2, Plagioclase Feldspar, and Biotite)
Basalt (Vesicular)
Basalt (Extrusive Volcanic Rock)
Geode with Quartz and possibly Jasper/Hematite
Quartz (SiO2) and Chalcedony (cryptocrystalline SiO2), possibly stained by iron oxides
Quartz Geode
Silicon Dioxide (SiO2)
Basalt with inclusion
Basalt (Aphanitic-Porphyritic texture)
Basalt with Scoria
Amygdaloidal Basalt / Vesicular Basalt
Druzy Quartz on Chert/Chalcedony
Silicon Dioxide (SiO2)
Quartz Geode (likely within Limestone or Dolomite matrix)
Quartz (SiO₂)
Basalt
Basalt (Mafic volcanic rock)
Amber-bearing Coal/Sedimentary Rock
Bituminous coal or carbonaceous siltstone with Fossilized Tree Resin (C10H16O)
Desert Varnish on Sandstone
Ferromanganese coating on Quartz Arenite
Gneiss
High-grade regional metamorphic rock (Foliated)
Basalt
Basalt
Shale (Beach-worn)
Laminated Pelite (primarily clay minerals and quartz)
Quartzite (Yellow/Orange variety)
Quartzite (primarily SiO2)
Pebble (likely a type of sandstone or quartzite pebble)
Clastic Sediment (specifically, a rudite-sized clast). If the pebble is composed of a specific rock type, its scientific name would be that rock type (e.g., 'Quartzite pebble', 'Granite pebble', 'Chert pebble'). Given its appearance, it is likely a metamorphic quartzite pebble or a hard sandstone pebble.
Pebble (likely Sandstone or Granitic Pebble)
Clastic Sediment (or specific rock type, e.g., Arenite, Granitoid Pebble)
Basalt
Mafic Igneous Rock (composed primarily of plagioclase feldspar and pyroxene)
Basalt
Basalt (Mafic volcanic rock)
Basalt Cobble
Aphanitic Mafic Igneous Rock (Basalt)
Druzy Quartz on Chert/Siltstone
Silicon Dioxide (SiO2) on Microcrystalline Silica/Siltstone matrix
Sandstone (Weathered Cobble)
Clastic sedimentary rock (primarily SiO2)