Man Made Material (Jewelry, Metal Alloy)

Chert

Chert (Microcrystalline Silica, SiO2)

River Quartzite Spheroid

Recrystallized Orthoquartzite (SiO2)

Gneiss (likely)

Gneiss

Schist

Mica Schist

Mica Schist

Foliated Metamorphic Rock (rich in Muscovite or Biotite)

Basalt

Extrusive mafic igneous rock

Basalt

Basalt (Aphanitic Mafic Igneous Rock)

Bornite (Peacock Ore)

Bornite (Cu5FeS4)

Chert (often called Flint when dark)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Banded Sandstone

Arenite (composed primarily of Quartz: SiO2)

Stichtite in Serpentine (Atlantisite)

Mg6Cr2CO3(OH)16·4H2O (Stichtite) within Mg3Si2O5(OH)4 (Serpentine)

Red Sandstone

Arenite (primarily Quartz SiO2 with Hematite Fe2O3 cement)

Orange Calcite

Calcium Carbonate (CaCO3)

Limonite and Goethite encrusted Chert/Ironstone

Hydrated Iron Oxide (FeO(OH)·nH2O) with cryptocrystalline Silica (SiO2)

Red Sandstone

Arenite (primarily Quartz with Hematite cement)

Ironstone with Pyrite

Ferruginous Sandstone (Fe2O3) with minor Sulfide minerals (FeS2)

Jasper with Manganese Dendrites

Silicon Dioxide (SiO2) with Oxide Mineral Inclusions

Coquina / Fossiliferous Limestone

Fossiliferous Calcarenite (Calcium carbonate, CaCO3)

Chert (with Manganese Dendrites)

Chert (Cryptocrystalline Quartz, SiO2)

Moqui Marble (Moqui Ball)

Ironstone Concretion (Goethite/Hematite cemented Sandstone)

Green Aventurine

Silicon Dioxide with Fuchsite (SiO2 + K(Al,Cr)2AlSi3O10(OH)2)

Amphibolite with Hornblende

Amphibole-rich Metamorphic Rock (Ca2(Mg,Fe)5Si8O22(OH)2)

Anthropogenic Heat Source (Electronic/Industrial Interface)

Thermal IR emission (Electronic infrastructure)

Basalt

Basalt (Mafic volcanic rock, primarily Plagioclase and Pyroxene)

Granite

Granite (Felsic Plutonic Rock)

Desert Varnish on Sandstone

Ferromanganese coating on Quartz Arenite

Blue Celestite (Celestine) Cluster

Strontium sulfate (SrSO4)

Quartzite

Metamorphosed Quartz Sandstone (primarily SiO2)

Chert (Light Grey / Flint variant)

Cryptocrystalline Quartz (SiO2)

Granite

Granite (a felsic intrusive igneous rock)

Quartzite Cobble

Metamorphosed Quartz Sandstone (primarily SiO2)

Limonite (Iron Stone Concretion)

Limonite (Hydrous Iron Oxide) - FeO(OH)·nH2O

Schist (specifically Mica Schist)

Mica Schist

Chert

Microcrystalline Quartz (SiO2)

Chert / Flint

Microcrystalline or cryptocrystalline quartz (SiO2)

Chert (Arrowhead or Projectile Point)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Limestone

Calcium Carbonate (CaCO3)

Quartzite

Quartzite (SiO2)

Conglomerate with Fossilized Shark Teeth

Clastic sedimentary rock (Conglomerate) containing Elasmobranchii remains

Vesicular Basalt (Scoria)

Basalt (Extrusive Igneous Rock)

Red Jasper

Silicon Dioxide (SiO2) with Hematite inclusions

Shale

Fissile mudrock (composed of clay-sized particles and detrital grains)