Chert (Quartz Pebble)
Silicon Dioxide (SiO2)
sedimentary
Category
Not A Rock Or Mineral (Anthropogenic Material)
Browse not a rock or mineral (anthropogenic material) specimens identified by the Rock Identifier community.
Peridot
Olivine ((Mg,Fe)2SiO4)
Mineral
Tektite (specifically Indochinite)
Tektite (Natural silica glass)
Mineraloid (Impact glass)
Granite
Phaneritic plutonic rock (dominated by Quartz, Feldspar, and Mica)
igneous
Garnet (likely Pyrope or Almandine)
Garnet Group (complex nesosilicate minerals, e.g., Pyrope Mg3Al2(SiO4)3, Almandine Fe3Al2(SiO4)3, Spessartine Mn3Al2(SiO4)3, Grossular Ca3Al2(SiO4)3, Andradite Ca3Fe2(SiO4)3, Uvarovite Ca3Cr2(SiO4)3). The vivid red color in the image strongly suggests Pyrope or Almandine.
Mineral
Basalt (River Stone)
Aphanitic Mafic Igneous Rock
igneous
Basalt
Basalt (Aphanitic Mafic Igneous Rock)
igneous
Basalt
Basalt
Igneous
Serpentine
Serpentinite (rock), Serpentine group minerals (e.g., Antigorite, Lizardite, Chrysotile)
Metamorphic rock
Chert (Jasper/Iron-stained Quartzite)
Silicon Dioxide (SiO2)
sedimentary
Limonite (Iron Ore)
Hydrated Iron(III) Oxide-Hydroxide (FeO(OH)·nH2O)
mineral
Chert
Chert (Microcrystalline Silica, SiO2)
sedimentary
Tufa
Calcareous Tufa (CaCO3)
sedimentary
Quartz (variety of colors)
SiO2 (Silicon Dioxide)
Mineral
Chert (Jasper/Flint variety)
Microcrystalline Quartz (SiO2)
sedimentary
Chert (and Flint)
Cryptocrystalline Quartz (SiO2)
sedimentary
Diamond (in Jewelry)
Carbon (C)
mineral
Chert (Nodular or Massive Variety)
Cryptocrystalline Quartz (SiO2)
sedimentary
Pebble (likely Sandstone or Granitic Pebble)
Clastic Sediment (or specific rock type, e.g., Arenite, Granitoid Pebble)
Rock (likely Sedimentary)
Limonite (Iron Ore)
Limonite (Hydrated iron(III) oxide-hydroxide, FeO(OH)·nH2O)
mineral
Chert (Jasper variety)
Silicon Dioxide (SiO2)
sedimentary
Diorite
Diorite (Intermediate intrusive igneous rock)
igneous
Limestone (specifically Fossiliferous or Crinoidal Limestone)
Calcium Carbonate (CaCO3) - Calcite Rock
sedimentary
Jasper and Yellow Chert (Tumbled)
Microcrystalline Quartz (SiO2)
sedimentary
Chert (specifically Flint or Dark Chert)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Chert / Flint Nodule
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Banded Chert (Jasper)
Silicon Dioxide (SiO2)
sedimentary
Chert (Grey-Green Flint)
Microcrystalline silicon dioxide (SiO2)
sedimentary
Slate
Slate (foliated metamorphic rock, primarily composed of quartz, illite, chlorite, and micas)
metamorphic
Sandstone (Weathered Cobble)
Clastic sedimentary rock (primarily SiO2)
sedimentary
Bituminous Coal
Organic-rich sedimentary rock (Complex hydrocarbons)
sedimentary
Chert (Yellow/Brown variety)
Chert (SiO2)
sedimentary
Serpentinite (Serpentine Rock)
Serpentinite is a rock composed of one or more serpentine group minerals, chiefly antigorite, chrysotile, and lizardite, with the general formula (Mg,Fe)3Si2O5(OH)4. Often includes other minerals like magnetite, talc, and chromite.
Metamorphic Rock
Chert (includes Flint & Jasper)
Chert (Siliceous sedimentary rock, chemical formula SiO2)
sedimentary
Quartz
Quartz (SiO₂)
Mineral
Red Jasper
Jasper (a cryptocrystalline variety of Quartz, SiO₂)
Sedimentary Rock
Diamond
Diamond (Carbon, C)
mineral
Chert (specifically Flint or Gray Chalcedony)
Microcrystalline Quartz (SiO2)
sedimentary
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Aventurine
Aventurine Quartz (SiO2 with inclusions)
Mineral
Granite (Weathered River Rock)
Plutonic Igneous Rock (primarily Quartz, Feldspar, and Mica)
igneous
Chert (Flint variety)
Chert (SiO2)
sedimentary