Quartz (Small Fragment)
Silicon Dioxide (SiO2)
mineral
Category
Not A Rock
Browse not a rock specimens identified by the Rock Identifier community.
Learn about Not A Rock in the encyclopedia
View all →
Amethyst
Amethyst (SiO2)
mineral
Milky Quartz
Crystalline Silicon Dioxide (SiO2)
mineral
Basalt with Peridotite Xenolith
Mafic Igneous Rock with Peridotite Inclusion (Olivine-rich)
igneous
Amethyst (Geode/Druzy)
Silicon Dioxide (SiO2) with iron impurities
mineral
Shale (with Iron Oxide staining)
Fissile Mudstone (primarily Quartz and Clay minerals)
sedimentary
River/Stream Pebble
Clast / Detrital Grain / Rounded Sedimentary Particle (Compositionally variable, commonly Quartz, Feldspar, Chert, or other resistant rock fragments)
Mineral, specifically a rock fragment
Peridotite
Peridotite (composed largely of Olivine (Mg,Fe)2SiO4)
igneous
Granite
Phaneritic Igneous Rock (primarily Quartz, Feldspar, and Mica)
igneous
Granite
Phaneritic Igneous Rock (primarily Quartz, Feldspar, and Mica)
igneous
Sandstone
Arenite (SiO2 primarily)
sedimentary
Basalt
Extrusive mafic igneous rock
igneous
Granite Cobble
Phaneritic Felsic Igneous Rock
igneous
Quartz (Milky Quartz/Citrine Type)
Silicon Dioxide (SiO2)
mineral
Granitoid (Granitic Rock)
Granitoid (Quartzo-feldspathic plutonic rock)
igneous
Scoria (Volcanic Rock)
Scoria (often basaltic scoria)
Igneous
Quartzite River Rock
Quartzite (SiO2)
metamorphic
Sandstone
Clastic sedimentary rock (primarily SiO2)
sedimentary
Sandstone
Clastic sedimentary rock (primarily SiO2)
sedimentary
Sandstone
Arenite
sedimentary
Vesicular Basalt (or Scoria)
Vesicular Basalt
igneous
Granite
Granite (Felsic Plutonic Rock)
Igneous
Basalt
Basalt (Mafic volcanic rock)
igneous
Chert (Jasper)
Silicon Dioxide (SiO2)
sedimentary
Ruby in Zoisite
Ruby (Corundum, Al2O3) in Zoisite (Calcium aluminum silicate hydroxide, Ca2Al3(SiO4)3(OH)) with some Hornblende
Metamorphic Rock (specifically a rock composed of minerals)
Sandstone (Ferruginous)
Arenite (primarily SiO2 with iron oxide cement)
sedimentary
Serpentine
Serpentinite (complex of Mg, Fe, Ni, Al, Zn, Mn)Si2O5(OH)4
metamorphic
Green Aventurine
Silicon Dioxide (Quartz) with Fuchsite inclusions (SiO2 + K(Al,Cr)2(AlSi3O10)(OH)2)
metamorphic
Peach Moonstone
Orthoclase Feldspar ((K,Na)AlSi3O8) with inclusions
mineral
Carnelian
Carnelian (Cryptocrystalline Quartz, SiO2)
mineral
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Blue Chalcedony
Silicon Dioxide (SiO2) - Microcrystalline Quartz
mineral
Muscovite Mica
Muscovite (KAl2(AlSi3O10)(OH)2)
mineral
Quartz Geode
Silicon Dioxide (SiO2)
mineral
Sandstone (Ferruginous)
Arenite (composed primarily of SiO2 with Fe2O3 staining)
sedimentary
Clear Quartz (Rock Crystal)
Silicon Dioxide (SiO2)
mineral
Quartz (with probable host rock)
Silicon Dioxide (SiO2)
mineral
Banded River Rock / Gneiss (highly weathered)
Gneiss
Metamorphic rock
Stony-Iron Meteorite (likely Mesosiderite or Ordinary Chondrite)
Meteorite (Silicate-Metal Matrix)
meteorite
Unidentifiable Specimen
Undetermined
Unknown
Sandstone
Arenite (SiO2 based clastic rock)
sedimentary
Granite
Granite (Phaneritic intrusive igneous rock)
igneous