Man Made Material, Not A Natural Rock Or Mineral Specimen

Sandstone

Arenite (primarily SiO2)

Sea Glass (White/Clear)

Amorphous Silica (Alkali-Lime-Silica Glass), SiO2 + Na2O + CaO

Tumbled-looking granite pebble

Granite, chiefly quartz–feldspar with biotite/amphibole

Breciated Jasper

Silicon Dioxide (SiO2) with iron oxide inclusions

Luminous Stone (Glow-in-the-dark Synthetic/Man-made Stone)

Strontium Aluminate tinted glass or resin (Crystalline silicate/oxide mix)

Blue Dyed Agate

Silicon Dioxide (SiO2)

Granite Pebble

Granite; primarily composed of Quartz (SiO2), Feldspar (KAlSi3O8), and Mica

River Cobble (likely Metasedimentary)

Metasedimentary Rock / Quartz-rich Sandstone

Fossilized Bored Limestone

Limestone with Ichnofossils (Gastrochaenolites or Entobia)

Diamond

Carbon (C), Native Element

Fossilized tooth or tooth fragment

Indeterminate vertebrate tooth; likely mammalian, mineralized hydroxyapatite

Weathered iron-rich rock, possibly limonite-bearing sandstone

Limonite/goethite mixture, approximately hydrated iron oxides (FeO(OH)·nH₂O), possibly coating sandstone or ironstone

Brecciated Jasper

Brecciated Jasper (Microcrystalline Quartz / SiO2)

Flagstone

Sedimentary Sandstone / Flagstone

Tumbled blue quartzite or blue chalcedony (uncertain)

Quartz-rich rock; predominantly silicon dioxide (SiO₂)

Green Agate

Silicon Dioxide (SiO2) - Chalcedony variety

Beach Pebble (Basalt / Greywacke)

Basalt (or fine-grained Sedimentary Greywacke)

Sandstone

Arenite (Sedimentary Rock)

Sandstone (Pebble)

Sandstone (SiO2 dominated with minor feldspar/clay)

Weathered quartz-rich rock, possibly chert or quartzite fragment

Indeterminate; likely microcrystalline quartz (SiO₂), possibly with iron-oxide staining

Sandstone (River Cobble / Pebble)

Sedimentary Rock (Quartz Sandstone / Arenite)

Shale with Vein Infillings

Shale (a fine-grained clastic sedimentary rock). The veins could be Calcite (CaCO3), Quartz (SiO2), or other minerals.

Yellow Chalcedony (Agate or Citrine Quartz)

Silicon Dioxide (SiO2)

Sandstone with Liesegang Rings

Arenite with Iron Oxide Liesegang Banding

Sandstone

Sandstone (composed predominantly of Quartz, SiO2)

Crushed Granite and Quartz Gravel

Composite Igneous and Silicate Rock Aggregate

Quartz

Silicon Dioxide (SiO2)

Agate (Chalcedony)

Silicon Dioxide (SiO2)

Sandstone (likely Ferruginous)

Arenite (SiO2 with iron oxide impurities)

Unknown Organic Object (likely a berry or fruit)

Not applicable; this is not a geological specimen. If it were a cranberry, its scientific name would be Vaccinium macrocarpon; if a cherry, it would be Prunus avium or Prunus cerasus.

Sandstone

Arenite (SiO2 primarily)

Ocean Jasper

Orbicular Jasper (Silicon Dioxide with impurities), SiO2

Granite

Granite (a phaneritic intrusive igneous rock consisting mainly of quartz, alkali feldspar, and plagioclase)

Polished red banded stone, likely rhodonite

Rhodonite — manganese inosilicate, MnSiO₃; possibly rhodochrosite or dyed quartz

Sandstone (Ferruginous)

Clastic Sedimentary Rock (Litharenite)

Rounded quartz-rich pebble

Likely milky quartz (SiO₂), possibly quartzite or a quartz-rich river pebble

Blue Goldstone

Aventurine glass (Synthetic borosilicate glass with cobalt and metallic inclusions)

Sandstone (Quartzose)

Arenite (SiO2 based)

Sandstone

Arenite (SiO2 based with quartz, feldspar, or lithic fragments)

Granite Gravel (Pebble)

Intrusive Felsic Igneous Rock

Diamond (Round Brilliant Cut)

Carbon (C)

Quartz with impurities or Host Rock

SiO2 (Silicon Dioxide) with mixed silicates