Chert (variations include Flint/Novaculite)
Chert (formula: SiO2)
Category
Browse sedimentary (man made conglomerate) specimens identified by the Rock Identifier community.
Chert (variations include Flint/Novaculite)
Chert (formula: SiO2)
Chert (often called Flint for darker varieties)
Silicon Dioxide (SiO2) - Cryptocrystalline Quartz
Chert (Nodule/Pebble)
Chert (Silicon Dioxide, SiO2)
Chert (Jasper/Flint variant)
Silicon Dioxide (SiO2)
Chert (Arrowhead Fragment)
Microcrystalline Quartz (SiO2)
Chert (specifically Black Chert or Flint)
Cryptocrystalline Quartz (SiO2)
Quartz
Silicon dioxide (SiO₂)
Synthetic Convention Badge (Plastic/PVC)
Polyvinyl Chloride (PVC) / Polycarbonate
Chert (Field-collected Arrowhead-shaped Fragment)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
Fossiliferous Limestone (Coquina)
Biogenic Limestone (Calcium Carbonate, CaCO3)
Chert (specifically Zebra Chert/Flint)
Silicon Dioxide (SiO2)
Petoskey Stone
Hexagonaria percarinata (Fossilized Rugose Coral)
Crushed Limestone
Calcium Carbonate (CaCO3)
Rough Sapphire (Corundum)
Corundum (Al2O3)
Pumice
Pumice (Vitreous volcanic rock)
Diamond (Cut jewelry specimen)
Diamond (pure Carbon, C)
Ruby in Matrix
Corundum (Al2O3)
Chert Pebble/Nodule
Chert (a microcrystalline or cryptocrystalline sedimentary form of quartz, SiO2)
Blue-dyed Quartz Druzy
Silicon Dioxide (SiO2) with artificial pigment
Quartz (likely Jasper or Chert variety)
Quartz (SiO₂)
Obsidian
Volcanic Glass (70% or more SiO2)
Pumice
Pumice (Vesicular volcanic glass)
Pink Granite
Phaneritic Felsic Igneous Rock (Granite)
Pyrite
Iron Sulfide (FeS2)
Blue Lace Agate
Chalcedony (SiO2) with trace inclusions
Chert (Flint variety)
Chert (Microcrystalline or Cryptocrystalline Quartz), SiO2
Chert (specifically Yellow/Brown Chert or Flint)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
Obsidian
Volcanic glass (SiO2 - Silicon Dioxide)
Engineered Quartz Stone
Agglomerated Quartz (SiO2 + Polymer Resin)
Obsidian
Volcanic Glass (Amorphous Silicon Dioxide)
Green Banded Chert (Agate/Jasper)
Silicon Dioxide (SiO2) with trace impurities of Chlorite or Glauconite
Diamond
Diamond (pure Carbon, C)
Chert (Jasper/Flint variant)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
Pyrite
Iron Disulfide (FeS2)
US Penny
Cuprum (Copper: Cu) and Zincum (Zinc: Zn) Alloy
Porphyritic Basalt (with Amygdales)
Amygdaloidal Porphyritic Basalt
Marble
Marble (metamorphosed limestone or dolostone), primarily composed of calcite (CaCO3) or dolomite (CaMg(CO3)2)
Granite
Plutonic Igneous Rock (composed typically of SiO2, Al2O3, K2O, Na2O, CaO)
Chert (Flint variety)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
Granite
Phaneritic Igneous Rock (composed primarily of Quartz, Alkali Feldspar, and Plagioclase)
Diabase (Greenstone)
Diabase (also known as Dolerite)
Red Slag Glass (Cullet)
Amorphous Silicon Dioxide (SiO2) with metallic dopants