Chert (specifically Gray Chert) rock specimen

Chert (specifically Gray Chert)

Silicon Dioxide (SiO2)

sedimentary

Sandstone (likely Graywacke or Arkose variant) rock specimen

Sandstone (likely Graywacke or Arkose variant)

Clastic Sedimentary Rock (SiO2 based)

sedimentary

Granite rock specimen

Granite

Granite (Felsic intrusive igneous rock)

igneous

Basalt rock specimen

Basalt

Basalt (principally Plagioclase and Pyroxene)

igneous

Geode (Chert or Quartz Nodule) rock specimen

Geode (Chert or Quartz Nodule)

Silicon Dioxide (SiO2)

sedimentary

Ironstone Concretion rock specimen

Ironstone Concretion

Limonitic/Hematitic Concretion

sedimentary

Sandstone (likely Ferruginous) rock specimen

Sandstone (likely Ferruginous)

Sandstone (SiO2 with iron oxides)

sedimentary

Jasper rock specimen

Jasper

Jasper (Silicon Dioxide, SiO2)

sedimentary

Chert (Jasper variety) rock specimen

Chert (Jasper variety)

Microcrystalline Quartz (SiO2)

sedimentary

Ferruginous Quartz on Ironstone rock specimen

Ferruginous Quartz on Ironstone

Silicon Dioxide (SiO2) with Hematite (Fe2O3)

metamorphic

Iron Ore (Hematite/Magnetite mixture) rock specimen

Iron Ore (Hematite/Magnetite mixture)

Ferrous Oxide (Fe2O3 / Fe3O4)

sedimentary

Basalt with Granite Inclusions (Xenoliths) rock specimen

Basalt with Granite Inclusions (Xenoliths)

Mafic igneous rock (Basalt) with Sialic minerals

igneous

Granodiorite rock specimen

Granodiorite

Granodiorite (intermediate intrusive igneous rock)

igneous

Biotite (Black Mica) rock specimen

Biotite (Black Mica)

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

mineral

Jasper rock specimen

Jasper

Silicon Dioxide (SiO2)

sedimentary

Rough Agate/Chert Nodules rock specimen

Rough Agate/Chert Nodules

Cryptocrystalline Quartz (SiO2)

sedimentary

Amethyst rock specimen

Amethyst

Amethyst (Silicon Dioxide, SiO2 with Iron impurities)

mineral

Yellow Calcite rock specimen

Yellow Calcite

Calcium Carbonate (CaCO3)

mineral

Yellow Calcite rock specimen

Yellow Calcite

Calcium Carbonate (CaCO3)

mineral

Pink Granite rock specimen

Pink Granite

Phaneritic Plutonic Igneous Rock (high K-feldspar)

igneous

Mica Schist rock specimen

Mica Schist

Mica Schist (predominantly Muscovite or Biotite sheet silicates)

metamorphic

Sandstone (likely Arkosic or Lithic Sandstone) rock specimen

Sandstone (likely Arkosic or Lithic Sandstone)

Arenite (SiO2 based with mineral inclusions)

sedimentary

Jasper rock specimen

Jasper

Silicon dioxide (SiO2)

sedimentary

Limestone rock specimen

Limestone

Calcareous sedimentary rock (CaCO3)

sedimentary

Gneiss (specifically Banded Gneiss) rock specimen

Gneiss (specifically Banded Gneiss)

Gneiss

metamorphic

Pink Quartzite rock specimen

Pink Quartzite

Quartzite (primarily SiO2 with iron oxide impurities)

metamorphic

Conglomerate with Quartzite Pebbles rock specimen

Conglomerate with Quartzite Pebbles

Clastic sedimentary rock (Conglomerate)

sedimentary

Yellow Jasper rock specimen

Yellow Jasper

Jasper (Silicon Dioxide with Iron Oxide impurities, SiO2)

sedimentary

Chert (and Jasper/Flint variety) rock specimen

Chert (and Jasper/Flint variety)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

sedimentary

Chert (Jasper/Agate variety) rock specimen

Chert (Jasper/Agate variety)

Microcrystalline Quartz (SiO2)

sedimentary

Quartzite rock specimen

Quartzite

Quartzite (primarily SiO2)

metamorphic

Quartz (Milky Quartz) rock specimen

Quartz (Milky Quartz)

Silicon Dioxide (SiO2)

mineral

Emerald in Matrix rock specimen

Emerald in Matrix

Beryllium Aluminum Silicate (Be3Al2Si6O18) with Chromium/Vanadium impurities

mineral

Sodalite rock specimen

Sodalite

Sodalite (Na8Al6Si6O24Cl2)

mineral

Amethyst (Tumbled Stone) rock specimen

Amethyst (Tumbled Stone)

Amethyst (Silicon Dioxide with Iron impurities, SiO2)

mineral

Chalcedony (Grey/White Agate) rock specimen

Chalcedony (Grey/White Agate)

Silicon Dioxide (SiO₂)

mineral

Grey Agate rock specimen

Grey Agate

Silicon Dioxide (SiO2) - Variety of Chalcedony

mineral

Agate (Moss or Dendritic Agate) rock specimen

Agate (Moss or Dendritic Agate)

Chalcedony (Silicon Dioxide, SiO2)

mineral

Chrysocolla and Azurite in Matrix rock specimen

Chrysocolla and Azurite in Matrix

Hydrated copper phyllosilicate (Chrysocolla - Cu2H2Si2O5(OH)4) and Copper carbonate (Azurite - Cu3(CO3)2(OH)2)

mineral

Blue Chalcedony rock specimen

Blue Chalcedony

Silicon Dioxide (SiO2)

mineral

Blue Chalcedony rock specimen

Blue Chalcedony

Silicon Dioxide (SiO2) - Microcrystalline Quartz

mineral

Lapis Lazuli rock specimen

Lapis Lazuli

Lapis lazuli (a rock primarily composed of Lazurite: (Na,Ca)8(AlSiO4)6(S,Cl,SO4,OH)2)

metamorphic