Quartz
Quartz (SiO2 - Silicon Dioxide)
Mineral
Category
Organic Materia (Not A Rock Or Mineral)
Browse organic materia (not a rock or mineral) specimens identified by the Rock Identifier community.
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
Sandstone
Clastic sedimentary rock (primarily SiO2)
sedimentary
Blue Sapphire
Corundum (Al2O3) with traces of Iron and Titanium
mineral
Basalt Pebble with Epidote/Olivine
Vitreous Basalt (SiO2 with Ca/Mg/Fe silicates)
igneous
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Greenschist (Greenstone)
Chlorite Schist / Greenschist Facies Rock
metamorphic
Sandstone (Ferruginous)
Arenite (primarily SiO2 with iron oxide staining/cementing)
sedimentary
Quartz Pebble
Quartz (Silicon Dioxide, SiO2)
mineral
Chalcedony in Host Rock
Chalcedony (SiO2)
mineral
Gold Ore
Native Gold (Au) in Matrix
mineral
Zinc Ore (Sphalerite in Matrix)
Sphalerite (Zn,Fe)S within a carbonate or silicate host rock
mineral
Greenstone / Diabase Porphyry
Porphyritic Diabase (Micro-gabbro)
Igneous
Banded Gneiss
Gneiss (High-grade Metamorphic Rock)
metamorphic
Quartz (River Pebble)
Silicon Dioxide (SiO2)
mineral
Quartz (specifically Milky or Clear Quartz)
Silicon Dioxide (SiO2)
mineral
Milky Quartz
Quartz (Silicon Dioxide, SiO2)
mineral
Carnelian Agate
Silicon Dioxide (SiO2) - Variety: Chalcedony
mineral
Quartz (Milky Quartz)
Silicon Dioxide (SiO2)
mineral
Mica Schist
Mica Schist (predominantly Muscovite or Biotite sheet silicates)
metamorphic
Polished Basalt
Basalt (Mafic volcanic rock)
Igneous
Granite
Phaneritic Felsic Igneous Rock
igneous
Granodiorite
Granodiorite (Phaneritic intrusive igneous rock containing Plagioclase, Quartz, and Biotite/Amphibole)
igneous
Amethyst
Amethyst (Silicon Dioxide with iron impurities), SiO2
mineral
Conglomerate
Conglomerate (clastic sedimentary rock)
sedimentary
Quartz (Milky/Bull Quartz)
Silicon Dioxide (SiO2)
mineral
Sandstone Beach Pebble
Clastic Sandstone (SiO2 - Quartz-dominant)
sedimentary
Basalt
Basalt (Aphanitic-fine grained mafic igneous rock)
igneous
Iron-stained Quartzite / Chert
Silicon Dioxide (SiO2) with Hematite/Limonite impurities
metamorphic
Chert (Jasper/Flint variety)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Diorite
Phaneritic Intrusive Igneous Rock (Intermediate Composition)
igneous
Granite
Granite (composed primarily of Quartz, Feldspar, and Mica)
igneous
Magnetite Orthorthotropic Rock
Magnetite (Fe3O4)
mineral
Milky Quartz
Silicon Dioxide (SiO2)
mineral
White Agate (Chalcedony)
Silicon Dioxide (SiO2)
mineral
Basalt with inclusion
Basalt (Aphanitic-Porphyritic texture)
igneous
Gneiss
High-grade foliated metamorphic rock
metamorphic
Concretion or Geode (unbroken)
Varied (depending on mineral composition and cementing agent). For quartz-lined geodes, the scientific name of the dominant mineral would be Quartz (SiO2). For calcite-lined geodes, Calcite (CaCO3). Concretions are often composed of cryptocrystalline quartz (chert), calcite, or iron oxides.
Sedimentary rock (specifically a concretion or possibly a geode)
Yellow Jasper
Jasper, a microcrystalline variety of Quartz (SiO2) with iron inclusions
sedimentary
Greenschist (Chlorite Schist)
Greenschist (Metamorphic rock dominated by chlorite, actinolite, and epidote)
metamorphic
Basalt with Quartz/Zeolite Inclusions
Porphyritic Basalt (SiO2 with Aluminosilicates)
igneous
Chalcedony
Silicon dioxide (SiO2) - Cryptocrystalline Quartz
mineral