Anthropogenic Specimen (Man Made Material)

Milky Quartz/Clear Quartz Cluster

Silicon Dioxide (SiO2)

Sandstone (with Iron Staining)

Clastic sedimentary rock (primarily SiO2 with Fe2O3 oxides)

Peridotite (with Olivine and Pyroxene)

Ultramafic Magmatic Rock (Primary minerals: (Mg, Fe)2SiO4 and (Ca, Mg, Fe)2Si2O6)

Jasper

Silicon dioxide (SiO2)

Jasper River Stone

Silicon Dioxide with Iron Oxide impurities (SiO2 + Fe2O3)

Amber Flint (Chert)

Cryptocrystalline Quartz (Silicon Dioxide, SiO2)

Chert (Brecciated Chert)

Silicon Dioxide (SiO2)

Chert (Jasper/Flint variety)

Silicon Dioxide (SiO2)

Granite (Weathered River Rock)

Plutonic Igneous Rock (primarily Quartz, Feldspar, and Mica)

Jasper

Silicon dioxide (SiO2)

Bog Iron / Limonite Concretion

Goethite/Limonite mixture (FeO(OH)·nH2O)

Granite Cobble

Granite (Phaneritic Quartz-Feldspar-Mica intrusive rock)

Sandstone

Arenite (primarily SiO2)

Quartzite Pebble

Quartzite (SiO2)

Sandstone (Quartzose Sandstone)

Clastic sedimentary rock (SiO2 major component)

Sandstone (Ferruginous)

Arenite (primarily SiO2 with Fe2O3 cementation)

River Rock (Quartzite/Chert conglomerate)

Quartzite (SiO2)

Flowerstone

Porphyritic Basalt or Porphyritic Andesite

Pyrite in Quartz

Iron Sulfide (FeS2) in Silicon Dioxide (SiO2)

Pyrite

Iron Disulfide (FeS2)

Chert (Field Stone)

Chert (Silicon Dioxide, SiO2)

Sandstone

Clastic Sedimentary Rock (primarily Quartz, SiO2)

Chert (Common Opal/Jasper variety)

Silicon Dioxide (SiO2)

Sandstone (with potential iron-oxide staining)

Arenite (primarily SiO2)

Sandstone (with Iron concretions/staining)

Arenite (composed primarily of Quartz and Feldspar with Iron Oxide cement)

Chert / Flint

Chert (SiO2)

Sandstone (Ferruginous)

Arenite (with Hematite/Limonite cement)

Petrified Wood

Silicified Wood (SiO2)

Diamond (set in jewelry)

Diamond (Carbon, C)

Gneiss (Banded Gneiss)

Gneiss

Chrysocolla on Matrix

Hydrated copper phyllosilicate (Cu,Al)2H2Si2O5(OH)4·nH2O

Quartzite (Gold/Tan River Cobble)

Quartzite (composed primarily of crystalline SiO2)

Banded River Cobble with Mafic Dike

Hydrothermally altered Graywacke or Sandstone with Mafic Intrusion

Malachite in Matrix

Copper Carbonate Hydroxide (Cu2CO3(OH)2)

Pumice

Pumice (Vesicular volcanic glass)

Quartzite (River Cobble)

Metamorphic Quartz-rich Rock

Porphyritic Andesite

Andesite (porphyritic variety)

Chert (variously known as Flint or River Pebble)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Banded Calcite (often sold as Onyx or Mexican Onyx)

Calcite (Calcium Carbonate, CaCO3)

Synthetic Zinc/Polycarbonate Composite (Bey-specimen)

Zinc Alloy (Zamak 3) with Polycarbonate (C15H16O2)n Overlay

Tektite (Indochinite)

Tektite (High-silica natural glass, primarily SiO2 with Al2O3)

River Quartz Pebble

Quartz (Silicon Dioxide, SiO2)