Marble

River Pebble (Greywacke or Quartzite-rich Sandstone)

Lithic Sandstone (primarily SiO2 with rock fragments)

Sandstone (with Limonite staining)

Arenite (primarily SiO2 with FeO(OH)·nH2O)

Chert / Flint

Cryptocrystalline Quartz (SiO2)

Quartz Pebble

Silicon Dioxide (SiO2)

Chert (White Chert / Flint)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Ferruginous Sandstone

Arenite with Iron-Oxide Cement (SiO2 with Fe2O3/FeO(OH))

Chert (Tan/Buff Chert)

Microcrystalline Quartz (SiO2)

Orange Calcite

Calcium Carbonate (CaCO3)

Diamond

Native Carbon (C)

Favosites (Honeycomb Coral Fossil)

Favosites sp. (Phylum Cnidaria, Order Tabulata)

Chert / Flint

Cryptocrystalline Quartz (SiO2)

Chert (Common Variety)

Cryptocrystalline Quartz (SiO2)

Chert (Flint)

Microcrystalline Quartz (SiO2)

Mookaite Jasper

Radiolarite (Silicon Dioxide, SiO2)

Sandstone (Quartzose)

Arenite (primarily SiO2)

Diamond

Carbon (C)

Chert (Commonly known as Flint)

Microcrystalline Quartz (SiO2)

Chert (Yellow Jasper variant)

Silicon Dioxide (SiO2) - Microcrystalline Quartz

Chert (Green variety)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Raw Diamond

Diamond (pure Carbon, C)

Chert (containing Flint and Chalcedony)

Microcrystalline Quartz (SiO2)

Ferruginous Chert (Jasper)

Silicon Dioxide (SiO2) with iron oxide inclusions

Chert (specifically Flint or Gray Chert)

Silicon Dioxide (Microcrystalline Quartz), SiO2

Sandstone with Calcite Vein

Clastic sedimentary rock (primarily SiO2) with Calcium Carbonate (CaCO3) infilling

Limestone

Calcium Carbonate (CaCO3)

Shale or Siltstone

Sedimentary Rock (Siliciclastic)

Chert (vuggy variety)

Microcrystalline silica (SiO2)

Orthoceras Fossil Limestone

Orthoceras (extinct genus of cephalopod); Limestone matrix (CaCO3)

Peridot

Olivine (Magnesium Iron Silicate - (Mg, Fe)2SiO4)

Chert (Jasper/Iron-stained Quartzite)

Silicon Dioxide (SiO2)

Ocherous Sandstone (Ferruginous Sandstone)

Ferruginous Arenite (SiO2 with Fe2O3)

Sandstone (Ferruginous)

Arenite (SiO2 with Iron Oxide impurities)

Chert Pebble (with Quartz Vein)

Chert (Cryptocrystalline Silica - SiO2)

Chert (Iron-stained)

Microcrystalline Quartz (SiO2)

Chert (often called Flint or Jasper)

Silicon Dioxide (SiO2)

Chert (Smooth River Pebble)

Silicon Dioxide (SiO2)

Coral Fossil (Favosites type)

Phylum Cnidaria, Class Anthozoa (often CaCO3 - Calcium Carbonate)

Jasper

Silicon Dioxide (SiO2) - Jasper (Microcrystalline Quartz)

Diamond

Carbon (C)

Chert (specifically a variety like Flint or River Jasper with Iron Oxidation)

Microcrystalline Quartz (SiO2)

Ironstone Nodule (Ironstone Concretion)

Siderite-rich Mudstone (FeCO3) or Limonite (FeO(OH)·nH2O)

Chert (Jasper/Agate variety)

Microcrystalline Quartz (SiO2)