Chert (Arrowhead)
Chert (SiO2)
sedimentary
Category
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Chert (Flint/Chalcedony)
Silicon Dioxide (SiO2)
sedimentary
Chert (River Pebble)
Silicon Dioxide (SiO2)
sedimentary
Fire Opal (Common/Precious in Matrix)
Hydrated Silica (SiO2·nH2O)
mineral
Chert (and/or Siltstone River Pebble)
Silicon Dioxide (SiO2) - Microcrystalline Quartz
sedimentary
Chert (specifically Chalcedony or Flint variation)
Microcrystalline Quartz (SiO2)
sedimentary
Corundum (Sapphire/Ruby in Matrix)
Corundum (Al2O3)
mineral
Chert (or Jasper)
Microcrystalline Quartz (SiO2)
sedimentary
Lake Superior Agate
Chalcedony (SiO2 with iron impurities)
mineral
Tangerine Quartz
Silicon Dioxide (SiO2) with Hematite/Limonite coatings
mineral
Citrine Quartz
Silicon Dioxide (SiO2) with iron impurities
mineral
Shungite
Non-crystalline carbonoid (Shungite)
metamorphic
Black Obsidian
Volcanic Glass (Amorphous Silicon Dioxide, SiO2)
igneous
Agate Geode Node
Cryptocrystalline Quartz (SiO2)
mineral
Agate Geode Node
Cryptocrystalline Quartz (SiO2)
mineral
Zebra Stone (Banded Chert or Limestone)
Silicon Dioxide (SiO2) with Calcium Carbonate (CaCO3) inclusions
sedimentary
Chalcedony (Agate/Chert variety)
Silicon Dioxide (SiO2)
sedimentary
Shungite
Non-crystalline carbon (Fullerene-bearing)
mineral
Chert / Flint Nodules in Sandstone
Microcrystalline Quartz (SiO2) within Clastic Sedimentary Rock
sedimentary
Agate
Silicon Dioxide (SiO2)
mineral
Tektite (Indochinite)
Tektite (Silica-rich natural glass)
mineral
Sapphire
Corundum (Al2O3)
mineral
Sandstone Flagstone
Quartz Arenite Sandstone
sedimentary
One Pound Coin (UK)
Nickel-Brass Alloy (Cu-Zn-Ni)
mineral
Obsidian / Chert (Arrowhead Artifact)
Obsidian (volcanic glass, SiO2 with impurities)
igneous
Green Quartz / Aventurine
Silicon Dioxide (SiO2) with inclusions
Metamorphic
Quartzite (River Pebble)
Recrystallized Quartz (SiO2)
metamorphic
Clear Quartz
Quartz (Silicon Dioxide, SiO2)
mineral
Banded Chert
Microcrystalline Quartz (SiO2)
sedimentary
Quartzite Arrowhead (Archaeological Lithic)
Recrystallized Quartz (SiO2)
metamorphic
Jasper
Silicon dioxide (SiO2)
sedimentary
Orbicular Jasper
Silicon Dioxide (SiO2)
sedimentary
Blue Sapphire
Corundum (Al2O3 with trace Titanium and Iron)
mineral
Chert (Jasper variety)
Silicon dioxide (SiO2)
sedimentary
Amygdaloidal Basalt with Agate/Chalcedony Infills
Amygdaloidal Basalt (Composition: SiO2 and (Mg,Fe)2SiO4 in matrix; SiO2 in amygdule)
igneous
Synthetic Resin (Artificial Specimen)
Polyurethane or Polyester Resin
mineraloid (man-made)
Lepidodendron Fossil in Sandstone
Lepidodendron (Lycophytina, Lepidodendrales)
sedimentary
Green Chert
Microcrystalline Quartz (SiO2)
sedimentary
Note: The image provided is a fabric sock, not a geological specimen.
Polyester-Cotton Blend with Elastane
Synthetic/Natural Fiber (Non-Geological)
Citrine
Silicon Dioxide (SiO2) with Fe3+ impurities
mineral
Synthetic Resin Charm (Seal Shape)
Polymer Resin with plastic glitter / Polyethylene terephthalate glitters
Synthetic material (Not a rock or mineral)
Sedimentary Strata of the Badlands (Mudstone, Siltstone, and Sandstone)
White River Group (Brule and Chadron Formations)
sedimentary