Quartz
Silicon Dioxide (SiO2)
mineral
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 →
Amygdaloidal Basalt
Amygdaloidal Basalt (with secondary mineral infilling)
igneous
Gneiss
Gneiss (Metamorphic Rock)
metamorphic
Alabaster
Gypsum (Calcium Sulfate Dihydrate, CaSO4·2H2O)
sedimentary
Quartz on Schist
Silicon Dioxide (SiO2) on Foliated Metamorphic Rock
metamorphic
Vesicular Basalt
Basalt with secondary mineral infills
igneous
Gabbro (or Basalt Pebble)
Mafic Intrusive/Extrusive Igneous Rock
igneous
Fire Opal in Host Rock
Amorphous Hydrous Silica (SiO2·nH2O)
mineral
Tiger's Eye (with Blue Tiger's Eye / Hawk's Eye)
Pseudomorph of Quartz after Crocidolite (SiO2 with inclusions)
metamorphic
Basalt Pebble
Basaltic Igneous Rock
igneous
Limonite (Iron Ore)
Limonite (FeO(OH)·nH2O)
mineral
Painted River Rock
Artificially Coated Sedimentary Rock
sedimentary
Sandstone with Magnetite and Iron Staining
Clastic Sedimentary Rock (contains Fe3O4 and Limonite/Hematite)
sedimentary
Granite
Intrusive Igneous Rock
igneous
Muscovite Mica Schist
Metamorphic Rock (Muscovite-Biotite Schist)
metamorphic
Faceted Clear Quartz
Crystalline Silicon Dioxide (SiO2)
mineral
Clear Quartz
Silicon dioxide (SiO2)
mineral
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Quartz Crystal Point
Silicon Dioxide (SiO2)
mineral
Clear Quartz (Rock Crystal)
Silicon Dioxide (SiO2)
mineral
Quartz Druzy on Matrix
Silicon Dioxide (SiO2)
mineral
Quartz Pebble
Silicon Dioxide (SiO2)
sedimentary
Granite (Specimen: Logan Rock)
Phaneritic plutonic igneous rock (mainly Quartz, Feldspar, and Mica)
igneous
River Rock (Basalt or Sandstone)
Clastic Sedimentary Rock or Extrusive Mafic Igneous Rock
igneous or sedimentary
Quartz Pebble
Silicon Dioxide (SiO2)
sedimentary
Granite Pebble
Intrusive Igneous Rock
igneous
Sandstone
Arenite
sedimentary
Sandstone (lithic/greywacke variant)
Clastic sedimentary rock (primarily SiO2 with rock fragments)
sedimentary
Sandstone
Sedimentary Rock (Quartz arenite or arkose)
sedimentary
Basalt with Amygdule
Aphanitic Mafic Volcanic Rock (Basalt) with Zeolite/Quartz Infill
igneous
Quartz Vein in Matrix
Silicon Dioxide (SiO2) within Rhyolitic or Granitic Matrix
igneous
Geode
Quartz / Chalcedony nodule with mineralized cavity
sedimentary
Granite
Intrusive Igneous Rock
igneous
Quartz (River Pebble)
Silicon Dioxide (SiO2)
mineral
Mexican Crazy Lace Agate
Silicon Dioxide (SiO2) with iron and aluminum inclusions
mineral
Fossiliferous Chert with Brachiopod Impression
Chert (SiO2) containing Brachiopoda fossil remains
sedimentary
Sandstone
Sandstone (arenite is a more specific geological term for a clean sandstone, while wacke refers to a dirty sandstone with significant matrix)
Sedimentary
Schist
Metamorphic Rock (Mica Schist)
metamorphic
Black Obsidian
Volcanic Glass (Amorphous SiO2 with trace impurities)
igneous
Uncertain small pale mineral fragment
Indeterminate; possibly calcite or a light-colored feldspar fragment
mineral
Basalt with Calcite Veins
Aphanitic mafic volcanic rock with CaCO3 inclusions
igneous
Weathered Sandstone
Quartz Arenite / Clastic Sedimentary Rock
sedimentary