Anthropogenic (Human Made) Sedimentary Like Material

Granite (Dioritic variant)

Granite (Phaneritic Igneous Rock)

Carnelian

Chalcedony (cryptocrystalline quartz), SiO2

Chert (Yellow Jasper/River Pebble)

Microcrystalline Quartz (SiO2)

Brachiopod Fossil in Shale

Phylum Brachiopoda (often species of Order Spiriferida or Rhynchonellida)

Sandstone (Banded)

Clastic Sedimentary Rock (primarily SiO2 with Iron Oxide staining)

Quartzite

Quartzite (composed primarily of SiO2)

Limestone (Grey and White specimens)

Calcium Carbonate (CaCO3)

Granite

Phaneritic Igneous Rock (composed primarily of Quartz SiO2, Alkali Feldspar, and Plagioclase)

Carnelian (Red Chalcedony)

Silicon Dioxide (SiO2)

Sandstone (likely Arkosic)

Clastic Sedimentary Rock (Sandstone)

Agatized Fossil or Chalcedony Nodule

Silicon Dioxide (SiO2) - Cryptocrystalline Quartz

Sandstone (Quartzose type)

Arenite (primarily SiO2)

Diorite (Polished Tumble)

Diorite (Intermediate intrusive igneous rock)

Limestone

Calcium Carbonate (CaCO3)

Quartz

Quartz (SiO₂)

Quartz

Quartz (SiO2)

Sandstone with trace fossil

Sandstone, possibly with Skolithos or similar trace fossil

Iron Ore (Limonite and Hematite)

Goethite/Limonite (FeO(OH)·nH2O) and Hematite (Fe2O3)

Orange Quartz with Epidote

Silicon Dioxide (SiO2) with Calcium Aluminum Iron Silicate hydroxide (Ca2(Al2,Fe)(SiO4)(Si2O7)O(OH))

Amber (Copal)

Organic gemstone, fossilized tree resin (often immature amber or copal)

Banded Chert

Cryptocrystalline Quartz (SiO2)

Red Jasper

Jasper (Silicon Dioxide with Iron Oxide inclusions), SiO2 + Fe2O3

Sandstone (likely Red/Brown Sandstone)

Arenite (SiO2 based)

Red Jasper (Opaque Chalcedony)

Silicon Dioxide (SiO2) with Hematite (Fe2O3) inclusions

Limonite

Limonite (Hydrated iron oxide mixture, FeO(OH)·nH2O)

Jasper

Silicon dioxide (SiO2) with impurities

Red Jasper

Silicon Dioxide (SiO2)

Red Jasper

SiO2 (Silicon Dioxide with Iron inclusions)

Fossil Shell (Bivalve)

Phylum Mollusca, Class Bivalvia (typically composed of Calcium Carbonate / CaCO3)

Mahogany Obsidian

Volcanic Glass with Hematite/Magnetite inclusions (SiO2 + Fe2O3)

Chert / Flint (a variety of Chert)

Chert (SiO2)

Sandstone

Clastic sedimentary rock (primarily SiO2)

Carnelian

Chalcedony (cryptocrystalline quartz), SiO2

Sandstone (Ferruginous)

Sandstone (primarily SiO2 with Iron Oxide cement)

Ammonite Fossil

Ammonoidea (primarily composed of Calcite, CaCO3)

Marble (polished)

Recrystallized Calcite (CaCO3)

Graphite-veined Quartzite

Meta-sedimentary Quartzite with Carbonaceous/Graphitic Inclusions (SiO2 + C)

Petrified Wood

Silicified Wood (primarily SiO2)

Jasper

Jasper (Silicon Dioxide, SiO2)

Sandstone (likely Arkosic or Lithic Sandstone)

Clastic Sedimentary Rock (SiO2 with assorted minerals)

Limestone

Calcium Carbonate (CaCO3)

Quartz (likely Milky Quartz or Chalcedony)

Quartz (SiO2 - Silicon Dioxide)