Quartzite
Quartzite (SiO2)
metamorphic
Category
Mineral, Specifically A Detrital Grain
Browse mineral, specifically a detrital grain specimens identified by the Rock Identifier community.
Desert Rose
Gypsum (CaSO4·2H2O) or Baryte (BaSO4) with trapped sand grains
mineral
Red Sandstone
Arenite (primarily Quartz with Iron Oxide coating)
sedimentary
Granodiorite
Granodiorite (containing Quartz, Plagioclase Feldspar, Biotite, and Hornblende)
igneous
Olivine (Peridot)
Olivine (Mg, Fe)2SiO4
mineral
Granite Pebble
Granite (Phaneritic Quartz-Feldspar Rock)
igneous
Sandstone with Quartz Vein
Arenite with Quartz (SiO2) Infilling
sedimentary
Sandstone (Ferruginous)
Arenite with Iron Oxide cement
sedimentary
Granite (Micro-specimen)
Plutonic Igneous Rock (primarily Quartz, Feldspar, and Mica)
igneous
Greenschist (Chlorite Schist)
Greenschist (containing chlorite, actinolite, and epidote)
metamorphic
Diorite
Plutonic Igneous Rock (Intermediate Composition)
Igneous
Granite
Plutonic Igneous Rock (composed of Quartz, Alkali Feldspar, and Plagioclase)
igneous
Sandstone (likely a river or beach pebble)
Sandstone (a clastic sedimentary rock)
Sedimentary Rock
Red Sandstone
Arenite (primarily Quartz with Iron Oxide)
sedimentary
Gneiss
Gneiss (High-grade metamorphic rock)
metamorphic
Sandstone
Arenite (Siliclastic sedimentary rock, primarily SiO2)
sedimentary
Sandstone (Quartzose type)
Arenite (primarily SiO2)
sedimentary
Garnet (Almandine variety)
Almandine, Fe3Al2(SiO4)3
Mineral
Dalmatian Stone (commonly Dyed)
Dalmatian Jasper (Peralkaline igneous rock)
igneous
Quartz (Quartzite)
Silicon Dioxide (SiO2)
metamorphic
Sandstone
Arenite
sedimentary
Conglomerate
Conglomerate (Clastic Sedimentary Rock)
Sedimentary
Conglomerate
Conglomerate (SiO2 primary clasts with lithic matrix)
sedimentary
Granodiorite
Granodiorite (Quartz + Plagioclase + Alkali Feldspar + Biotite/Hornblende)
igneous
Diorite (River Pebble)
Intermediate plutonic igneous rock
igneous
Manganese-coated Sandstone
Clastic sedimentary rock with Manganese Oxide (often Pyrolusite or Psilomelane)
sedimentary
Basalt with Quartz Vein
Mafic Igneous Rock (SiO2 filling)
igneous
Diorite
Diorite (an intrusive igneous rock)
igneous
Schist
Mica Schist
metamorphic
Basalt
Mafic Igneous Rock (composed primarily of plagioclase, pyroxene, and olivine)
igneous
White Agate / Chalcedony
Silicon Dioxide (SiO2)
mineral
Eudialyte in Matrix
Na15Ca6(Fe,Mn)3Zr3(Si,Nb) (Si25O73) (OH,Cl,H2O)3
mineral
Granite
Granite (Phaneritic intrusive igneous rock)
igneous
Sandstone (Quartzose)
Arenite (primarily SiO2)
sedimentary
Granite Pebble (Salt and Pepper Granite)
Phaneritic Felsic Igneous Rock (primarily Quartz, Feldspar, and Biotite/Amphibole)
igneous
Fossilized Fish Skeleton in Matrix
Vertebrata (Class: Actinopterygii), typically found in limestone or shale matrices
sedimentary
Granodiorite Pebble
Granodiorite (containing Quartz, Plagioclase Feldspar, and Biotite/Amphibole)
igneous
Granite
Phaneritic Igneous Rock (primarily Quartz, Feldspar, and Mica)
igneous
Amygdaloidal Rhyolite
Rhyolite (felsic volcanic rock) with amygdules
igneous
Basalt (with possible quartz veinsing)
Basalt
igneous
Sandstone (Quartzose)
Arenite (primarily SiO2)
sedimentary
Dalmatian Stone (Dalmatian Jasper)
Peralkaline Quartz-Feldspar Porphyry with Arfvedsonite
igneous