Anthropogenic Specimen (Man Made)

Cinnabar in Quartz

Silicon Dioxide (Quartz, SiO2) with Mercury Sulfide inclusions (Cinnabar, HgS)

Basalt Arrowhead (worked stone)

Aphanitic mafic volcanic rock (Basalt)

Porphyritic Basalt

Amygdaloidal Porphyritic Basalt

Chert (River Pebble)

Microcrystalline Quartz (SiO2)

Quartzite Pebble

Quartzite (SiO2)

Quartzite

Quartzite (primarily SiO2)

Quartzite (River Pebble)

Metamorphosed Quartz-rich Sandstone (SiO2)

Banded Chert (Ironstone/Jasper)

Cryptocrystalline Quartz (SiO2) with Iron Oxides

Granite (with Muscovite Mica)

Phaneritic Felsic Igneous Rock (primarily Quartz SiO2, K-Feldspar KAlSi3O8, and Muscovite KAl2(AlSi3O10)(OH)2)

Fossil Sand Dollar (Echinoidea)

Phylum Echinodermata, Class Echinoidea (likely Dendraster or Scutella)

Iron-stained Quartz

Silicon Dioxide with Iron Oxide (SiO2 with Limonite/Hematite impurities)

Yellow Chalcedony or River Jasper

Silicon Dioxide (SiO2)

Chert (and Chalcedony)

Silicon Dioxide (SiO2)

Botryoidal Chalcedony (likely Desert Rose/Agatized Geode Crust)

Silicon Dioxide (SiO2)

Sandstone (Ferruginous)

Arenite (Fe-rich SiO2)

Carnelian

SiO2 (Chalcedony with iron oxide impurities)

Quartz / River Cobble

Silicon Dioxide (SiO2)

Chert (Chalcedony/Jasper)

Microcrystalline Quartz (SiO2)

Gold in Quartz Matrix

Native Gold (Au) with Quartz (SiO2) and Slate/Shale

Shale with Plant Fossils / Carbonaceous Shale

Laminated Mudrock (Siliciclastic)

Rough Quartz (Iron-stained)

Silicon Dioxide (SiO2)

Granite Pegmatite with Tourmaline and Muscovite

Pegmatite (Feldspar: KAlSi3O8, Quartz: SiO2, Schorl: NaFe2+3Al6(Si6O18)(BO3)3(OH)3(OH))

Fossiliferous Limestone

Calcium Carbonate (CaCO3) with Bioclastic Inclusions

Granitic Pegmatite with Biotite

Pegmatitic Granite (contains KAlSi3O8, SiO2, K(Mg,Fe)3AlSi3O10(OH)2)

Quartz Geode (River Cobble)

Silicon Dioxide (SiO2)

Chalcedony Nodule (Commonly known as Agate or Chert)

Microcrystalline Quartz (SiO2)

Bicolor Quartz Pebble

Silicon Dioxide (SiO2) with mineral inclusions

Gold Ore

Auriferous Quartz and Sulfide Mineralization in Host Rock

Quartzite with Quartz Vein

Quartzite (SiO2)

Ferruginous Chert

Microcrystalline Quartz (SiO2) with Iron Oxides

Granite (Pink/Potassium-rich)

Phaneritic Plutonic Felsic Igneous Rock (primarily SiO2 with KAlSi3O8)

Quartz Pebble

Silicon Dioxide (SiO2)

Fossiliferous Chert with Brachiopod Impression

Chert (SiO2) containing Brachiopoda fossil remains

Ruby (Corundum)

Corundum (Aluminum Oxide with Chromium), Al2O3:Cr

Green Quartzite (Aventurine variety)

Silicon Dioxide (SiO2) with inclusions of Fuchsite

Chert (Jasper variety)

Silicon Dioxide (SiO2)

Gneiss (specifically a weathered Amphibolite or Garnet Gneiss)

Gneiss (complex silicate composition)

Labradorite

(Ca, Na)(Al, Si)4O8 (Plagioclase Feldspar)

Quartzite

Quartzite (primarily SiO2)

Hematite

Iron(III) oxide (Fe2O3)

Labradorite

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

Yellow Jasper

Silicon Dioxide (SiO2) with iron hydroxides (Goethite)