Sedimentary (Man Made)

Shale (possibly)

Shale (fine-grained clastic sedimentary rock)

Chert (Flint)

Chert (microcrystalline quartz)

Chert (or Flint)

Silicon dioxide (SiO2)

Concretion

Various mineral compositions, typically carbonate or iron oxide cemented sediment

Chert Pebble (Jasperoid/Flint)

Silicon Dioxide (SiO2) - cryptocrystalline quartz

Carnelian Agate

Carnelian (Silicon Dioxide - SiO2)

Emerald

Beryl (Be3Al2(SiO3)6) with Chromium/Vanadium impurities

Sand Dollar Fossil (Echinoidea)

Class Echinoidea (likely order Clypeasteroida), CaCO3 (Calcite)

Chert (specifically Flint or Dark Chalcedony)

Silicon Dioxide (SiO2)

Chert (Holey Stone)

Microcrystalline Quartz (SiO2)

Granitic Gneiss

Gneiss (High-grade Metamorphic Rock)

Specular Hematite (Iron Ore)

Iron(III) oxide (Fe2O3)

Sandstone

Arenite (primarily SiO2 with trace Fe2O3)

Hematite (Iron Ore)

Hematite (Fe2O3)

Chert (often called Flint when dark)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Note on Image Identification: Textile

N/A (Anthropogenic material)

Chert (variations include Flint or Jasper)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Chert (Nodule)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Red Jasper

Silicon Dioxide (SiO2) with Hematite (Fe2O3) inclusions

Quartz

Quartz (Silicon Dioxide - SiO2)

Chert (Nodular Chert)

Microcrystalline Silica (SiO2)

Red Jasper (possibly Wonderstone)

Silicon Dioxide (SiO2) with iron oxide inclusions

Carnelian (a variety of Chalcedony)

SiO2 (Silicon Dioxide) - Cryptocrystalline Quartz

Quartz (likely Rose Quartz or Milky Quartz based on color)

Quartz (SiO2 - Silicon Dioxide)

Fluorite

Calcium Fluoride (CaF2)

Red Jasper (Polished)

Silicon Dioxide (SiO2) with Hematite inclusions

Chert (Fossiliferous)

Silicon dioxide (SiO2)

Jasper Geode

Silicon Dioxide (SiO2) with impurities

Jasper Agate (specifically Brecciated Jasper)

Silicon Dioxide (SiO2) with iron oxide and clay impurities

Granite

Granite (a common rock name, not a single mineral species, composed primarily of quartz, feldspar, and mica/amphibole)

Hematite (Iron Ore)

Hematite (Fe2O3)

Carnelian Agate

Silicon Dioxide (SiO₂), a variety of Chalcedony

Red Jasper

Jasper (Silicon Dioxide with Iron Oxide inclusions), SiO2

Chert (Chalk-associated Flint)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Bloodstone Jasper (Heliotrope)

SiO2 (Silicon Dioxide) - Cryptocrystalline Quartz

Red Jasper (possibly Brecciated Jasper or Bloodstone variety)

Jasper (Silicon Dioxide, SiO2)

Banded Gneiss

Gneiss (High-grade Regional Metamorphic Rock)

Milky Quartz

Silicon dioxide (SiO2)

Quartz

Silicon Dioxide (SiO2)

White Howlite

Howlite (Calcium borosilicate hydroxide, Ca2B5SiO9(OH)5)

Shale or Argillite

Shale (sedimentary) / Argillite (metamorphic)

Sandstone

Quartz Arenite (a common type of sandstone, given the appearance), Arkose, Greywacke (depending on mineralogy)