Anthropogenic Specimen (Man Made Material)

Zebra Rock / Zebra Marble

Banded Limestone-Marble Transition

Quartzite

Quartzite (SiO2)

Fluorite

Calcium Fluoride (CaF2)

Bauxite / Iron-rich Laterite

Laterite (principally Al(OH)3, Fe2O3, and SiO2)

Coquina

Biogenic Limestone (Calcitic shells)

Chert (Jasper variation)

Chert (Silicate mineral, SiO2)

Chert (Grey Flint)

Silicon Dioxide (SiO2) - Microcrystalline Quartz

Limonite (Iron Stone Concretion)

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

Ferruginous Sandstone

Sandstone, Iron-rich

Chert (Yellow Jasper variant)

Microcrystalline or cryptocrystalline Quartz (SiO2)

Chert (variations include Flint or Jasper)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Red Jasper

Silicon dioxide (SiO2) with iron oxide (Fe2O3) inclusions

Nuummite

Nuummite (Orthoamphibole rock / Anthophyllite-Gedrite blend)

Sandstone (specifically Cross-bedded Sandstone)

Arenite (composed primarily of SiO2)

Rose Quartz

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

Green Aventurine

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

Sandstone

Arenite (composed primarily of SiO2)

Scoria (Lava Rock)

Scoria (Extrusive Igneous Rock / Mafic Silicates)

Granite

Phaneritic Felsic Igneous Rock (primarily SiO2, Al2O3, K2O, Na2O)

Meteorite (Chondrite)

Stony Meteorite (Ordinary Chondrite)

Sandstone

Arenite (Sedimentary rock composed of sand-sized grains, primarily SiO2)

Quartz Pebble (Iron-Stained)

Quartz (Silicon Dioxide - SiO2)

Quartzite

Quartzite (primarily SiO2)

Chert (variations include Flint/Jasper)

Chert (SiO2)

Limestone

Calcium Carbonate (CaCO3)

Chert (varieties include Flint and Jasper)

Microcrystalline or Cryptocrystalline Silicon Dioxide (SiO2)

Obsidian

Obsidian (principally SiO2)

Chalk / Sedimentary Limestone

Calcium Carbonate (CaCO3) - Biogenic Sedimentary Rock

Petrified Wood

Silicified Wood (SiO2)

Sandstone (Ferruginous)

Arenite (with Iron Oxide cement)

Grey Chalcedony (Tumbled)

Chalcedony (SiO2)

Chert (varietal Flint)

Silicon Dioxide (SiO2)

Slate

Slate (Foliated Metamorphic Rock)

Granodiorite Pebble

Granodiorite (containing Quartz, Plagioclase Feldspar, and Biotite/Amphibole)

Greenstone

Protolith of basalt, diabase, or gabbro; often contains minerals like chlorite, actinolite, and epidote

Calcite

Calcium Carbonate (CaCO3)

Lapis Lazuli

Lapis Lazuli (Aggregate primarily of Lazurite: (Na,Ca)8(AlSiO4)6(S,SO4,Cl,1-2) with Calcite and Pyrite)

Schist

Crystalline Metamorphic Rock (Schistose)

Chert (variations include Flint/Jasper)

Chert (Silicon Dioxide, SiO2)

Pyrite

Iron Disulfide (FeS2)

Jasper

Silicon dioxide (SiO2)

Sandstone (Greywacke/Lithic Sandstone)

Arenite / Lithic Sandstone