Sedimentary (Chemically Precipitated Mineral)

Chert (Flint variety)

Microcrystalline Quartz (SiO2)

Chert (often called Flint)

Microcrystalline Quartz (SiO2)

Chert (specifically a flint nodule component)

Microcrystalline quartz (SiO2)

Chert (often called Flint)

Chert (Microcrystalline or cryptocrystalline Silica, SiO2)

Chert Arrowhead

Microcrystalline Quartz (SiO2)

Chert (specifically Red Chert or Jasper)

Microcrystalline Quartz (SiO2)

Limestone

Calcium Carbonate (CaCO3)

Chert (Flint)

Microcrystalline or cryptocrystalline Quartz (SiO2)

Chert / Flint

Chert (SiO2)

Chert (Jasper/Flint variety)

Microcrystalline Quartz (SiO2)

Chert (with Quartz Vein)

Microcrystalline silica (SiO2)

Sandstone

Sandstone (arenite is a more specific geological term for a clean sandstone, while wacke refers to a dirty sandstone with significant matrix)

Chert (variations include Flint or Jasper)

Chert (chemical sedimentary rock), Quartz (SiO2)

Limestone

Calcium Carbonate (CaCO3)

Chert (and associated Sedimentary rocks)

Microcrystalline Silica (SiO2)

Heulandite with Stilbite

Heulandite-Ca ((Ca,Na)2-3Al3(Al,Si)2Si13O36·12H2O) and Stilbite-Ca (NaCa4(Si27Al9)O72·28H2O)

Oolitic Limestone

Oolitic Carbonate (CaCO3)

Oolitic Limestone

Oolitic Limestone (Calcium Carbonate, CaCO3)

Chert (Flint)

Chert (Microcrystalline Quartz, SiO2)

Greywacke (likely)

Greywacke (a type of sandstone)

Chert (Yellow Jasper)

Microcrystalline Quartz (SiO2)

River Quartz Pebble

Quartz (Silicon Dioxide, SiO2)

Chert (often called Flint or Jasper)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Specular Hematite

Hematite (Iron Oxide, Fe2O3)

Moonstone

Orthoclase (Potassium Feldspar) - (K,Na)AlSi3O8

Azurite and Malachite on Matrix

Azurite: Cu3(CO3)2(OH)2; Malachite: Cu2CO3(OH)2

Amber (specifically Red or Cherry Amber)

Succinite (Resinite); Chemical formula: C10H16O

Blue Apatite

Apatite-(CaF), Ca5(PO4)3F (Calcium Fluorophosphate)

Agate (Dyed High-Grade Polished Slice)

Silicon dioxide (SiO2), Chalcedony crystal variety

Chert (potentially Flint or Mudstone)

Microcrystalline Quartz (SiO2)

Quartzite Pebble (River Rock)

Quartzite (primarily SiO2)

Quartzite

Quartzite (primarily SiO2)

Quartzite

Quartzite (SiO2)

Diabase (Greenstone)

Diabase (also known as Dolerite)

Diabase (Greenstone)

Diabase or Dolerite

Quartzite

Quartzite

Basalt with Quartz/Calcite Veins

Basalt (Aphanitic Mafic Volcanic Rock) with Silicon Dioxide (SiO2) or Calcium Carbonate (CaCO3) inclusions

Pyrite in Quartz

Iron Sulfide (FeS2) in Silicon Dioxide (SiO2)

Limestone with Algal/Lichen Colonization

Calcium Carbonate (CaCO3)

Quartz in Matrix (possibly Basalt or Siltstone host)

Silicon Dioxide (SiO2) in Host Rock

Ironstone Concretion (likely)

Goethite/Hematite/Limonite cemented sediment

Mahogany Obsidian

Volcanic Glass (predominantly SiO2 with Fe2O3 inclusions)