Anthropogenic Specimen (Man Made)

Clear Quartz (Rock Crystal)

Quartz (Silicon Dioxide, SiO2)

Quartz (Milky Quartz)

Silicon Dioxide (SiO2)

Fuchsite

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

Liesegang Banded Sandstone (Wonderstone)

Ferruginous Sandstone with Liesegang Rings

Quartzite with Iron Inclusions

Metamorphosed Sandstone (SiO2 dominated)

Dragon Blood Jasper

Epidote-rich Quartzite (SiO2 with Ca2(Al,Fe)3(SiO4)3(OH))

Yellow Jasper

Silicon Dioxide (SiO2) with Goethite/Limonite inclusions

Sandstone (Ferruginous)

Arenite (composed primarily of SiO2 with Fe2O3 cement)

Amygdaloidal Basalt with Epidote/Chlorite

Basalt (containing (Ca2(Al2Fe3+)(SiO4)(Si2O7)O(OH)))

Smoky Quartz

Smoky Quartz (Silicon Dioxide - SiO2)

Emerald

Beryl (Be₃Al₂(SiO₃)₆) with Chromium or Vanadium impurities

Pyrite and Fluorite on Quartz (Matrix Specimen)

Iron Disulfide (FeS2) and Calcium Fluoride (CaF2) with Silicon Dioxide (SiO2)

Hematite

Iron (III) Oxide, Fe2O3

Golden Healer Quartz

Silicon Dioxide (SiO2) with iron oxide inclusions

Eclogite

Eclogite (Pyrope garnet and Omphacite pyroxene)

Quartz (Iron-Stained)

Silicon Dioxide (SiO2)

Sandstone (Calcareous or Ferruginous)

Clastic sedimentary rock (SiO2 with CaCO3 or Fe2O3 cement)

Fluorite with Rhodochrosite

Fluorite (CaF2) and Rhodochrosite (MnCO3)

Yellow Agate

Agate (Microcrystalline Silicon Dioxide, SiO2)

Serpentinite (River Pebble)

Serpentinite (complex of Antigorite, Lizardite, and Chrysotile: Mg3Si2O5(OH)4)

Milky Quartz with Iron Staining

Quartz (Silicon Dioxide, SiO2)

Sandstone (Quartz Sandstone)

Clastic sedimentary rock (primarily SiO2)

Sandstone (likely Graywacke or Arkose variant)

Clastic Sedimentary Rock (Lithic Sandstone)

Smoky Quartz (Vein Quartz)

Quartz (Silicon Dioxide, SiO2)

River Cobble (Quartzite-rich Sandstone)

Clastic Sedimentary Rock (Litharenite/Quartzite transition)

Limestone (specifically Grainstone or Micrite)

Calcium Carbonate (CaCO3)

Sandstone (lithic wacke/arenite)

Clastic sedimentary rock (primarily SiO2)

Basalt (Water-worn Pebble)

Basalt (Mafic volcanic rock)

Basalt

Basalt (Mafic volcanic rock)

Chert (specifically Red Chert or Jasper)

Microcrystalline Quartz (SiO2)

Chert (Smooth River Pebble)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Howlite (Dyed to resemble Turquoise)

Calcium Borosilicate Hydroxide (Ca2B5SiO9(OH)5)

Magnetite / Iron-Rich Concretion

Magnetite (Fe3O4) or Bog Iron Limonite

Chert (and Chalcedony/Agate mixture)

Microcrystalline Quartz (SiO2)

Agate (Dyed High-Grade Polished Slice)

Silicon dioxide (SiO2), Chalcedony crystal variety

Agate

Silicon Dioxide (SiO2) - Cryptocrystalline Chalcedony

Sandstone (Water-worn Cobble)

Arenite (variable composition, primarily SiO2)

Chert (Yellow/Tan Variety)

Chert (SiO2)

Quartzite pebble

Metamorphic Quartzite (primarily SiO2)

Quartzite

Metamorphosed Quartz Sandstone (SiO2)

Sandstone (likely Greywacke or Siltstone variety)

Arenite / Siltstone (primarily SiO2)

Quartz (Common or Milky Quartz)

Silicon Dioxide (SiO2)