Man Made Material, Not A Natural Rock Or Mineral Specimen

Fossiliferous Sandstone (with Brachiopod or Bivalve mold)

Clastic Sedimentary Rock with Macrofossil Mold

Likely polished dark stone or glassy mineral bead

Indeterminate; possibly obsidian, hematite, or a dark agate

Sandstone

Sandstone (clastic sedimentary rock)

Quartz pebble

Silicon dioxide (SiO2)

Agate (specifically Botswana or Banded Agate variety)

Chalcedony (Silicon Dioxide, SiO2)

Red Sandstone

Arenite (Ferruginous Sandstone)

Blue Lace Agate

Chalcedony (SiO2) with trace inclusions

Milky quartz vein rock

Quartz, silicon dioxide (SiO₂), likely with iron-oxide staining and minor mica or sulfide minerals

Weathered sandstone or iron-stained siltstone

Quartz-rich clastic sedimentary rock, likely ferruginous sandstone

Sandstone (Quartzose Sandstone)

Clastic sedimentary rock (primarily SiO2)

Aquamarine

Beryllium Aluminum Silicate (Be3Al2Si6O18)

Slate

Slate (Metamorphic rock)

Milky Quartz with Chlorite/Amphibite Inclusions

Silicon Dioxide (SiO2) with various mineral inclusions

Sandstone (with possibly iron oxides and other minerals)

Sandstone

Sandstone (Water-worn Cobble)

Arenite (variable composition, primarily SiO2)

Raw gold nugget or gold-bearing quartz

Native gold (Au), possibly with quartz (SiO₂) and iron-oxide staining

Vesicular volcanic rock, likely scoria

Scoria; composition commonly basaltic to andesitic, rich in plagioclase and pyroxene

Polished orange agate/jasper cabochon

Microcrystalline quartz (chalcedony), SiO₂, with iron-oxide coloration; exact variety uncertain

Carved quartz (likely rose quartz and green aventurine/quartz)

Quartz, silicon dioxide (SiO₂); green material may be aventurine quartz or serpentine

Herkimer Diamond

Quartz (Silicon Dioxide) - SiO2

Smoky Quartz (with possible Garnet inclusions)

Silicon Dioxide (SiO2)

Sandstone Pebble

Sedimentary Rock (Quartzose Sandstone)

Gemstone bead necklace (likely citrine or yellow quartz)

Quartz, SiO₂; precise identification is uncertain because the beads are blurred and metal settings obscure them

Fossiliferous Mudstone / River Pebble

Sedimentary rock with trace fossil or inclusion

Sandstone (Ferruginous)

Arenite (with Iron Oxide cement)

Sandstone (likely Graywacke or Arkose variant)

Clastic Sedimentary Rock (Lithic Sandstone)

Sandstone

Sandstone (clastic sedimentary rock)

Mixed pebble collection, including likely flint, quartzite, and fossil material

Varied silicate rocks; visible specimen may include chert (microcrystalline SiO₂), quartzite, and a possible fossil

Rainbow aura quartz cluster

Quartz, silicon dioxide (SiO₂), artificially coated with a thin metallic film

Dinosaur Claw Fossil

Fossilized Theropod Claw (Vertebrate Palaeontological Specimen)

Vesicular quartz-rich rock, possibly weathered rhyolite or hydrothermal quartz

Likely quartz (SiO₂) with altered feldspar, iron oxides, and cavities; exact identification requires testing

Sandstone with Iron Staining

Arenite (SiO2 with Fe-oxide coatings)

Amethyst (Tumbled)

Purple Quartz (SiO2 with iron impurities and irradiation)

Quartz (Iron-Stained)

Silicon Dioxide (SiO2)

Sandstone (Quartzose)

Clastic sedimentary rock (primarily SiO2)

Diamond (or Cubic Zirconia simulant)

Carbon (C) or Zirconium Dioxide (ZrO2)

Sandstone

Arenite (composed primarily of SiO2)

Quartz-rich rock fragment, possibly granite or quartzite

Primarily quartz (SiO₂), with possible feldspar and iron-oxide staining

Quartz Vein in River Siltstone

Crystalline Quartz (SiO2) in Siliclastic Matrix

Chert (Chalcedony/Agate)

Microcrystalline Quartz (SiO2)

Chert (Flint)

Silicon Dioxide (SiO2)

Diamond

Carbon (C)