Milky Quartz
Silicon Dioxide (SiO2)
mineral
Category
Igneous And Sedimentary
Browse igneous and sedimentary specimens identified by the Rock Identifier community.
Banded Agate (specifically Carnelian Agate)
Silicon dioxide (SiO2) - Chalcedony variety
mineral
Sandstone
Arenite (SiO2 principal)
sedimentary
Pegmatite with Schorl (Black Tourmaline) and Mica
Pegmatite (complex association of NaAlSi3O8, NaFe3Al6(BO3)3Si6O18(OH)4, and KAl2(AlSi3O10)(OH,F)2)
igneous
Granite Pegmatite with Tourmaline and Muscovite
Pegmatite (Feldspar: KAlSi3O8, Quartz: SiO2, Schorl: NaFe2+3Al6(Si6O18)(BO3)3(OH)3(OH))
igneous
Granite
Granite
Igneous
Sodalite
Sodalite - Na8(Al6Si6O24)Cl2
mineral
Basalt
Basalt
Igneous
Banded Metamorphic Rock (likely Quartzite or Serpentinite/Soapstone)
Metamorphic Rock (possibly a banded Quartzite or a foliated Serpentinite/Talc Schist based on appearance, general term for such a rock is 'Banded Metamorphic Rock' or 'Gneiss' if pronounced banding of different minerals)
Metamorphic
Banded Gneiss (Variety of Gneiss)
Gneiss (specifically, a variety exhibiting prominent banding; mineral composition can vary, but often contains quartz, feldspar, mica, and amphibole)
Metamorphic Rock
Marble
Marble (primarily Calcite, CaCO3 or Dolomite, CaMg(CO3)2)
Metamorphic Rock
Quartz on Sandstone
Silicon Dioxide (SiO2) in Lithic Sandstone
sedimentary
Sandstone
Arenite (SiO2 based)
sedimentary
Sandstone
Arenite (composed primarily of SiO2)
sedimentary
Sandstone
Arenite (SiO2 principal component)
sedimentary
Sandstone
Clastic sedimentary rock (primarily SiO2)
sedimentary
Sandstone
Clastic sedimentary rock (primarily SiO2)
sedimentary
Sandstone (likely Arkose or Quartz Sandstone)
Clastic sedimentary rock (primarily SiO2)
sedimentary
Fish Fossil in Limestone
Lycoptera (likely) in Micritic Limestone
sedimentary
Sandstone (Quartzite Pebble)
Arenite (SiO2)
sedimentary
Chert (Jasper/Flint variant)
Microcrystalline Quartz (SiO2)
sedimentary
Limonite stained Sandstone
Sedimentary rock with Goethite/Limonite (FeO(OH)·nH2O)
sedimentary
Sandstone
Arenite
sedimentary
Sandstone (likely Calcareous or Micaceous)
Clastic sedimentary rock (primarily Quartz with Cementing Agents)
sedimentary
Sandstone (Quartzose Sandstone)
Arenite (primarily SiO2)
sedimentary
Shale
Laminated Mudstone
sedimentary
Granite
Granite (a felsic intrusive igneous rock)
Igneous rock
Granite
Granite (a felsic intrusive igneous rock)
igneous
Red Jasper (possibly Agatized Jasper)
Jasper (Silicon Dioxide, SiO2 with Fe2O3 inclusions)
sedimentary
Quartz Druze on Matrix
Silicon Dioxide (SiO2)
mineral
Banded Gneiss (with possible weathered sulfide or iron staining)
Gneiss, potentially with iron oxide/hydroxide staining (e.g., limonite) or weathered sulfides
Metamorphic
Banded Gneiss
Gneiss
Metamorphic
Quartz Vein in Sedimentary Rock
Silicon Dioxide (SiO2) with host Chert or Limestone
mineral
Obsidian
Extrusive igneous volcanic glass (rich in SiO2)
igneous
Basalt
Mafic Igneous Rock (primarily Plagioclase and Pyroxene)
igneous
Basalt
Basalt (Fine-grained extrusive igneous rock)
igneous
Red Scoria (Lava Rock)
Scoria (Extrusive Igneous Rock / Mafic composition)
igneous
Basalt
Mafic Igneous Rock (primarily Plagioclase and Pyroxene)
igneous
Pink Granite
Granite (Phaneritic felsic intrusive igneous rock)
igneous
Basalt River Pebble
Basalt (fine-grained mafic igneous rock)
igneous
Granite
Phaneritic Acidic Igneous Rock (Granite Group)
igneous
Basalt
Basalt (Vitreous to Aphanitic Mafic Igneous Rock)
igneous