Sedimentary Rock (Specifically A Chemical Sedimentary Rock, Or A Chert If Considered Purely Mineral Aggregate)

Quartz (Chert/Chalcedony variety)

Silicon Dioxide (SiO2)

Weathered limestone or dolostone

Calcite-rich limestone (CaCO₃), possibly dolomite-bearing

Chert (River Pebble)

Microcrystalline or cryptocrystalline Quartz (SiO2)

Chert (Nodule)

Chert (Silica, SiO2)

Chert (Red Jasper)

Microcrystalline Quartz (SiO2)

Chert

Silicon dioxide (SiO2)

Gneiss (specifically Micaceous Gneiss)

Gneiss (High-grade Regional Metamorphic Rock)

Chert (Gravel Bit)

Microcrystalline silica (SiO2)

Chert (Jasper/Flint variety)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Chert / Quartz Pebble

Silicon Dioxide (SiO2) - Microcrystalline Quartz

Chert / Jasper

Cryptocrystalline Quartz (SiO2)

Chert

Chert (microcrystalline quartz, SiO2)

Banded Calcite (often sold as Caribbean Calcite or Pink Calcite)

Calcium Carbonate (CaCO3)

Chert / Jasper

Microcrystalline Quartz (SiO2)

Sandstone (specifically Banded Sandstone)

Clastic sedimentary rock (primarily SiO2)

Quartz Pebble

Silicon Dioxide (SiO2)

Concrete / Anthropogenic Conglomerate

Man-made composite material (Portland cement, aggregate, and water)

Small rounded pebble, likely quartz-rich river stone

Indeterminate; likely quartz/chert-bearing lithic clast

Chert / Chalcedony Nodules

Silicon Dioxide (SiO2)

Coal (specifically Bituminous or Anthracite)

Organic sedimentary rock; primarily Carbon (C) with varying H, S, O, N

Chert (Jasper influence)

Microcrystalline Quartz (SiO2)

Sandstone (Ferruginous)

Sandstone (primarily SiO2 with iron oxide Fe2O3 staining)

Chert (Flint)

Chert (SiO2)

Fragmented Sedimentary Pebble

Clastic Sedimentary Specimen

Limestone with Chert Nodules

Sedimentary Calcium Carbonate (CaCO3) with Microcrystalline Silica (SiO2) inclusions

Chert

Microcrystalline Quartz (SiO2)

Reddish quartz-rich rock, possibly jasper or chert

Microcrystalline quartz (SiO₂), likely iron-oxide-stained jasper/chert

Sandstone

Arenite (specifically Quartz Arenite)

Chert (Iron-stained)

Chert (SiO2)

Jasper Chert

Microcrystalline Quartz (SiO2) with iron oxide inclusions

Chert (specifically Jasper or Flint type)

Microcrystalline Quartz (SiO2)

Jasper / Chert (Iron-stained Quartz)

SiO2 (Silicon Dioxide with Iron Oxide inclusions)

Sandstone (with Chert/Quartzite nodules)

Clastic sedimentary rock (primarily SiO2)

Mookaite Jasper

Silicified Radiolarite (SiO2)

River Pebble (Likely Chert or Fine-Grained Sandstone/Quartzite)

Siliciclastic clast (likely Chert or Quartzarenite/Quartzite pebble)

Chert (Jasper variety)

Silicon Dioxide (SiO2)

Orange Calcite

Calcium Carbonate (CaCO3)

Concrete / Conglomerate (Man-made)

Artificial Conglomerate (Cementitious Composite)

Banded Agate (Onyx variety)

Silicon Dioxide (SiO2) - Microcrystalline Quartz

Chert (varietal: Flint Pitted Pebble)

Cryptocrystalline Quartz (SiO2)

Chalcedony (Agate/Jasper mix in host rock)

Chalcedony (cryptocrystalline Silicon Dioxide, SiO2)

Red Jasper (Chert)

Silicon dioxide (SiO2) with iron oxide inclusions