Anthropogenic Specimen (Man Made Material)

Red Jasper (Tumbled)

Silicon Dioxide (SiO2) with iron oxide inclusions

Limonite (Bog Iron)

Limonite (Hydrated iron(III) oxide-hydroxide) - FeO(OH)·nH2O

Chert (variations include Flint)

Chert (Silicon Dioxide, SiO2)

Rose Quartz

Silicon Dioxide (SiO2) with trace amounts of Titanium, Iron, or Manganese

Sandstone

Arenite (primarily SiO2 - Silicon Dioxide)

Pyrite

Iron Sulfide (FeS2)

Chert (variously identified as Flint)

Microcrystalline Quartz (SiO2)

Siltstone

Siltstone

Siltstone with Quartz Vein

Siltstone (primarily SiO2, Al2O3, Fe2O3)

Brachiopod Fossil in Shale

Phylum Brachiopoda (often species of Order Spiriferida or Rhynchonellida)

Orthoclase Feldspar

Orthoclase (KAlSi3O8)

Gneiss

Gneiss (Metamorphic rock of variable composition, typically SiO2 rich)

Chert (Nodule)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Chert (specifically Flint or Common Chert)

Microcrystalline Quartz (SiO2)

Chert (Flint)

Chert (Cryptocrystalline Quartz, SiO2)

Chert (Blue-Gray Chert)

Microcrystalline quartz (SiO2)

Red Chert (Jasper)

Silicon Dioxide (SiO2)

Lapis Lazuli

Lapis Lazuli (Complex silicate rock containing Lazurite (Na,Ca)8(AlSiO4)6(S,Cl,SO4,OH)2, Pyrite, and Calcite)

Red Jasper

Jasper (Silicon Dioxide with Iron Oxide inclusions - SiO2)

Quartzite Pebble

Quartzite (primarily SiO2)

Chert (Flint)

Silicon Dioxide (SiO2) - Microcrystalline Quartz

Chert (specifically Red Chert or Jasper)

Microcrystalline Quartz (SiO2)

Chert (and Chalcedony)

Microcrystalline Quartz (SiO2)

Banded Chert (or Flint)

Microcrystalline Quartz (SiO2)

Sandstone

Sandstone (various mineral compositions)

Basalt Porphyry

Porphyritic Basalt

Diorite

Diorite (Intermediate intrusive igneous rock)

Chert (and associated Sedimentary rocks)

Microcrystalline Silica (SiO2)

Laterite

Laterite (Iron and aluminum-rich residual rock)

Chert (Flint)

Microcrystalline Quartz (SiO2)

Marble

Metamorphic rock composed of Recrystallized Carbonate Minerals (chiefly CaCO3)

Chert (often colloquially called Flint)

Chert (Microcrystalline Quartz, SiO2)

Chert (Jasper/Flint variety)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Coquina / Shelly Limestone

Bioclastic Limestone (composed of CaCO3)

Quartzite Pebble

Quartzite (primarily SiO2)

Chert (often called Flint or Jasper locally)

Chert (Microcrystalline Quartz, Formula: SiO2)

Obsidian

Obsidian (Volcanic Glass), primarily SiO2 (Silicon Dioxide)

Rose Quartz

Silicon Dioxide (SiO2) with trace amounts of titanium, iron, or manganese

Red Jasper

SiO2 (Silicon Dioxide with Iron inclusions)

Malachite

Copper(II) carbonate hydroxide [Cu2CO3(OH)2]

Travertine (often colloquially called Tufa)

Chemical Sedimentary Calcium Carbonate (CaCO3)

Red Sandstone

Arenite (primarily Quartz SiO2 with Hematite Fe2O3 cement)