Chert (specifically Flint or Jasper variant)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Category
Mineraloid (Organic)
Browse mineraloid (organic) specimens identified by the Rock Identifier community.
Chert (with Fossiliferous Silicification)
Silicon Dioxide (SiO2) - Microcrystalline Quartz
sedimentary
Gold-Bearing Quartz
Auriferous Quartz (SiO2 with native Au)
Mineral
Chert (Iron-stained)
Chert (SiO2 - Silicon Dioxide)
sedimentary
Chert (varieties include Flint and Jasper)
Microcrystalline or cryptocrystalline Quartz (SiO2)
sedimentary
Hag Stone
Perforated Sedimentary Rock (typically Limestone or Sandstone)
sedimentary
Red Quartzite Slipper Stone
Quartzite (SiO2)
metamorphic
Quartzite
Quartzite (SiO2)
metamorphic
Chert
Chert (Microcrystalline Silica, SiO2)
sedimentary
Jasper (specifically Chert/Ironstone)
Silicon Dioxide (SiO2) with Iron Oxide (Fe2O3) inclusions
sedimentary
Limestone
Calcium Carbonate (primarily CaCO3 as Calcite or Aragonite)
sedimentary
Granite
Phaneritic plutonic rock (composed of Quartz, Feldspar, and Mica/Amphibole)
igneous
Almandine Garnet in Schist
Almandine, Fe3Al2(SiO4)3
metamorphic
Chert (Gravel)
Chert (Cryptocrystalline silicon dioxide, SiO2)
sedimentary
Chert (Arrowhead Fragment)
Chert / Microcrystalline Silicon Dioxide (SiO2)
sedimentary
Quartzite with Gneissic Banding
Quartzite (primarily SiO2) with mafic mineral inclusions
metamorphic
Granite
Granite (Phaneritic intrusive igneous rock; primarily SiO2 and Al2O3)
igneous
Chert (Flint)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Quartz (Vein Quartz)
Silicon Dioxide (SiO2)
mineral
Red Jasper (Chert)
Silicon dioxide (SiO2) with iron oxide inclusions
sedimentary
Chert (Flint variety)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Chert (with small quartz inclusion)
Microcrystalline Silica (SiO2)
sedimentary
Greenschist (Chlorite Schist)
Greenschist (containing chlorite, actinolite, and epidote)
metamorphic
Chert (Flinty variety)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Gold Ore in Quartz/Schist
Auriferous Quartz and Sulfide-bearing Schist
Metamorphic/Igneous (Hydrothermal)
Granite
Phaneritic plutonic rock (primarily Quartz, Alkali Feldspar, and Plagioclase)
igneous
Quartzite pebble
Quartzite (primarily SiO2)
metamorphic
Schist (Graphite or Mica rich)
Crystalline Schist (often containing Muscovite, Biotite, or Graphite)
metamorphic
Jasper
Silicon dioxide (SiO2)
sedimentary
Gold Ore in Quartz
Auriferous Quartz (Au + SiO2)
igneous
Quartz Vein in Host Rock
Silicon Dioxide (SiO2)
mineral with metamorphic or sedimentary host
Quartzite
Quartzite (primarily SiO2)
metamorphic
Blue Calcite
Calcium Carbonate (CaCO3)
Mineral
Banded Chert
Silicon Dioxide (SiO2) - Microcrystalline Quartz
sedimentary
Quartzite
Quartzite (primarily SiO2)
metamorphic
Red Jasper
Silicon Dioxide (SiO2) with Hematite inclusions
sedimentary
Quartzite
Quartzite (SiO2)
metamorphic
Chert (with Iron Staining)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Cockle Shell (Fossil or Recent)
Class Bivalvia, Family Cardiidae (e.g., Cerastoderma edule for common cockle)
Sedimentary (Biogenic, a type of fossil)
Quartzite Pebble
Quartzite (primarily SiO2)
metamorphic
Granite
Phaneritic Felsic Igneous Rock
igneous
Chert (Tan/Brown variety)
Chert (Silicon Dioxide, SiO2)
sedimentary