Anthropogenic Specimen (Man Made Material)

Chert (specifically Flint or Jasper variant)

Microcrystalline quartz (SiO2)

Chert (Yellow Jasper variant)

Microcrystalline Quartz (SiO2)

Chert (often called Flint)

Microcrystalline or cryptocrystalline Quartz (SiO2)

Muscovite Mica

Muscovite (KAl2(AlSi3O10)(OH)2)

Crushed Limestone Aggregate

Limestone (Calcium Carbonate, CaCO3)

Quartz vein in Host Rock

Crystalline Silicon Dioxide (SiO2) in Lithic Matrix

Diamond

Diamond (pure Carbon, C)

Peridot (Olivine)

Olivine, (Mg, Fe)2SiO4

Serpentinite

Serpentinite (composed primarily of Serpentine group minerals: (Mg,Fe)3Si2O5(OH)4)

Basalt

Basalt (Mafic volcanic rock)

Fluorite

Calcium Fluoride (CaF2)

Sandstone

Arenite (primarily SiO2)

Sandstone (Wonderstone)

Arenite (composed primarily of SiO2 with Fe2O3 impurities)

Schist (with Iron Oxide)

Mica Schist

Sandstone (Quartz-rich)

Arenite (composed mainly of SiO2)

Conglomerate

Conglomerate (clastic sedimentary rock)

Sandstone (Ferruginous)

Clastic Sedimentary Rock (primarily SiO2 with Fe2O3 staining)

Rhodonite

Manganese Silicate (Mn,Fe,Mg,Ca)SiO3

Quartzite

Quartzite (primarily SiO2)

Chert (Chalky/Gray Variety)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Quartz Geode

Silicon Dioxide (SiO2) in Host Rock

Chert (specifically Red Chert / Jasper)

Silicon Dioxide (SiO2)

Chert (Brown Variety)

Microcrystalline quartz (SiO2)

Chert

Microcrystalline Quartz (SiO2)

Red Sandstone

Clastic Terrigenous Sedimentary Rock (typically Hematitic Quartz Arenite or Arkose)

Unakite

Unakitized granodiorite / Quartz-Epidote-Feldspar rock

Sandstone

Arenite (SiO2 based)

Slag Glass (Cullet Glass)

Amorphous Silica (Industrial byproduct)

Red Sandstone

Arenite (with Iron Oxide pigmentation)

Chert (Quartz Variety)

Silicon Dioxide (SiO2)

Chert (Banded)

Chert (Microcrystalline Silicon Dioxide, SiO2)

Chert (Flint)

Chert (SiO2)

Sandstone (likely Arkose)

Arenite (Feldspathic Sandstone / Arkose)

Siltstone

Siltstone (primarily SiO2, Al2O3)

Lapis Lazuli (Low Grade)

Lazurite-rich metamorphic rock ((Na,Ca)8(AlSiO4)6(SO4,S,Cl,OH)2)

Chert (Jasper/Flint variation)

Chert (SiO2)

Chert (specifically Flint or Jasper variant)

Silicon Dioxide (SiO2)

Chert (Yellow/Tan)

Microcrystalline Quartz (SiO2)

Diamond

Carbon (C)

Ironstone with Pyrite

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

Orange Quartzite (River Pebble)

Quartzite (SiO2 with iron oxide impurities)

Feldspar Granodiorite

Granodiorite (Na,Ca)(Si,Al)4O8