Mineral Based Alloy (Anthropogenic)

Epidosite (Epidote-rich rock)

Epidosite (consisting primarily of Epidote: {Ca2}{Al2Fe3+}(Si2O7)(SiO4)O(OH))

Sandstone (Greywacke)

Arenite / Greywacke Sandstone

Sandstone nugget

Arenite (primarily Quartz SiO2)

Sandstone (Quartz-rich)

Arenite

Quartz and Mixed Gravel

Silicon Dioxide (SiO2) with minor impurities

K2 Jasper (K2 Granite)

Azurite in Granite (K(Mg,Fe)3AlSi3O10(OH,F)2 + Cu3(CO3)2(OH)2)

River Cobble (likely Basalt or Greenstone)

Mafic Igneous Rock (with possible chloritic alteration)

Basalt with Calcite Veining

Aphanitic Mafic Igneous Rock (primarily Plagioclase and Pyroxene)

Schist

Mica Schist (Metamorphic Rock)

Mica Schist

Mica Schist (predominantly Muscovite or Biotite sheet silicates)

Sandstone (Ferruginous)

Arenite with Iron Oxide cement

Basalt with Weathering Crust

Extrusive mafic volcanic rock

Aura Quartz

Titanium-coated Silicon Dioxide (SiO2)

Aura Quartz (specifically Titanium Aura Quartz)

Titanium-coated Silicon Dioxide (SiO2 + Ti Coating)

Snowflake Obsidian

Spherulitic Obsidian (Amorphous volcanic glass with Phenocrysts of Cristobalite)

Fuchsite (Chrome Mica)

K(Al,Cr)2(AlSi3O10)(OH)2

Gabbro

Gabbro (Mafic Intrusive Igneous Rock)

Lepidolite

K(Li,Al)3(Al,Si,Rb)4O10(F,OH)2

Schist

Crystalline Metamorphic Rock (Schistose)

Sedimentary Breccia

Breccia (Clastic Sedimentary Rock)

Sandstone

Arenite (primarily SiO2)

Granite

Granite

Lepidolite (in Quartz Matrix)

Lepidolite [K(Li,Al)3(Al,Si,Rb)4O10(F,OH)2]

Granite

Phaneritic Plutonic Felsic Rock (SiO2, KAlSi3O8, NaAlSi3O8)

Granite

Granite (Phaneritic Quartz-Feldspar Plutonic Rock)

Fuchsite

Chromium-rich Muscovite (K(Al,Cr)2(AlSi3O10)(OH)2)

Dragon Vein Agate

Chalcedony (cryptocrystalline Quartz), SiO2

Dalmatian Stone (commonly called Dalmatian Jasper)

Peralkaline Rock (mixed Feldspar, Quartz, and Arfvedsonite)

Greenschist

Greenschist (Chlorite-actinolite schist)

Moss Agate

SiO2 with impurities (Chalcedony)

Biotite Schist

Biotite Mica Schist (K(Mg,Fe)3AlSi3O10(OH,F)2)

Fossil Shark Tooth

Elasmobranchii (Class) fossil - possibly Odontaspididae family

Amygdaloidal Basalt

Amygdaloidal Basalt (containing secondary minerals like Quartz, Zeolites, or Calcite)

Sandstone (with potentially high Feldspar/Arkose content)

Clastic sedimentary rock (SiO2 dominated)

Amygdaloidal Basalt

Basalt with secondary mineral infilling

Snowflake Obsidian

Volcanic glass containing Cristobalite (SiO2)

Vesicular Basalt with Xenocrysts

Mafic Igneous Plutonic/Extrusive Complex

Quartz / Common Gravel

Silicon Dioxide (SiO2)

Granite Pegmatite

Phaneritic Felsic Igneous Rock (Granite)

Fossil Shark Tooth

Carcharhiniformes fossil (likely Carcharhinidae family)

Schist

Mica Schist

Citrine Quartz

SiO2 (Silicon Dioxide with Iron impurities)