Chert (Flint) Nodule
Cryptocrystalline Quartz (SiO2)
sedimentary
Category
Sedimentary (Chemically Precipitated Mineral)
Browse sedimentary (chemically precipitated mineral) specimens identified by the Rock Identifier community.
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Chert (Flint variety)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Chert (Grey Chert)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Banded Agate (specifically Carnelian Agate slice)
Chalcedony (cryptocrystalline variety of Quartz), SiO2
mineral
Glauconite
Glauconite (K,Na)(Fe3+,Al,Mg)2(Si,Al)4O10(OH)2
mineral
River Pebble (Likely Chert or Fine-Grained Sandstone/Quartzite)
Siliciclastic clast (likely Chert or Quartzarenite/Quartzite pebble)
Sedimentary
Chert / River Jasper
Microcrystalline Quartz (SiO2)
sedimentary
Milky Quartz
Quartz (Silicon Dioxide - SiO2)
mineral
Azurite Geode
Azurite (Cu3(CO3)2(OH)2)
mineral
Gold (in Opaque Matrix/Jewelry)
Native Gold (Au)
mineral
Azurite and Malachite on Matrix
Cu3(CO3)2(OH)2 (Azurite) and Cu2CO3(OH)2 (Malachite)
mineral
Green Aura Quartz
Silicon Dioxide (SiO2) bonded with metallic vapors (typically Gold, Chromium, or Titanium)
mineral
Quartz (River Pebble)
Silicon Dioxide (SiO2)
mineral
Marble
Recrystallized Calcite (CaCO3)
metamorphic
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Orange Calcite (Banded Honey Calcite)
Calcium Carbonate (CaCO3)
mineral
Chert (often called Flint)
Chert (Microcrystalline or Cryptocrystalline Quartz, SiO2)
sedimentary
Chert (Pebble)
Microcrystalline Quartz (SiO2)
sedimentary
Chert (Flint variety)
Silicon Dioxide (SiO2)
sedimentary
Chert (Iron-stained)
Microcrystalline Quartz (SiO2)
sedimentary
Native Sulfur
Sulfur (S8)
mineral
Likely iron-rich chert or jasper
Microcrystalline quartz (SiO₂), variably stained by iron oxides/hydroxides
sedimentary
Slate
Slate (Metamorphic Rock)
metamorphic
Halite (Rock Salt)
Halite; NaCl (Sodium Chloride)
Mineral
Chert / Green Jasper
Silicon Dioxide (SiO2)
sedimentary
Quartz
Quartz (SiO₂)
Mineral
Calcareous Tufa / Limestone Fragment
Calcium Carbonate (CaCO3)
sedimentary
Chert (Gray Chalcedony)
Microcrystalline Quartz (SiO2)
sedimentary
Quartz Pebble (Iron-stained)
Silicon Dioxide (SiO2)
mineral
Weathered iron-rich rock, possibly laterite or limonite-bearing sandstone
Laterite/limonite-rich material; commonly dominated by goethite (FeO(OH)) and hydrated iron oxides
sedimentary
Ferruginous Quartz
Silicon Dioxide with Iron Oxide inclusions (SiO2 + Fe2O3)
mineral
Red Sandstone
Clastic sedimentary rock (primarily Quartz and Feldspar with Iron Oxide cement)
sedimentary
Chert (Green Chert or Jasper)
Microcrystalline Quartz (SiO2)
sedimentary
Banded Jasper (Chert)
Silicon Dioxide (SiO2) - variety of Chalcedony
Sedimentary Rock
Agate in Rhyolite
Silicon Dioxide (Quartz/Chalcedony) in Volcanic Rock matrix
igneous
Chert (Green variety)
Microcrystalline Quartz (SiO2)
sedimentary
Halite
Halite (Sodium Chloride, NaCl)
mineral
Quartz Druze on Matrix
Silicon Dioxide (SiO2)
mineral
Chert (Jasper/Flint variety)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Chert (variously known as Flint)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Concrete
Anthropogenic Sedimentary Rock (Hydrated Calcium Silicate)
sedimentary (anthropogenic / man-made)