Rock (Likely Sedimentary)

Green-and-white quartz-rich rock, likely chrysoprase or serpentine-bearing stone

Uncertain; possible chrysoprase (microcrystalline quartz, SiO₂) or serpentinite (magnesium silicate minerals)

Basalt with Feldspar phenocrysts

Aphanitic to Porphyritic Mafic Volcanic Rock

Banded calcite (travertine-like carbonate)

Calcite, CaCO₃; likely banded limestone or cave travertine

Iron-rich jasper / hematite-bearing breccia

Ferruginous jasper, chiefly microcrystalline SiO₂ with hematite/goethite (Fe₂O₃/FeO(OH)) and possible limonite

Likely weathered granite or granitic pegmatite

Granite; mainly quartz (SiO₂), feldspar, and mica, with possible iron-oxide staining

White chalcedony or quartz-rich pebble

Microcrystalline quartz (SiO₂), possibly with minor calcite or feldspar

Polished ocean jasper (orbicular jasper)

Microcrystalline quartz/chalcedony (SiO₂) with iron oxides and assorted alteration minerals

Tumbled citrine or iron-stained quartz

Quartz (SiO₂), likely iron-oxide-stained or natural citrine

Pegmatitic granite

Granite, quartz–feldspar–mica assemblage

Scoria (Lava Rock) and Granite

Vesicular Basalt (Scoria) and Monzogranite

Concrete fragment with Aggregate

Anthropogenic Concrete with Calcarious and Siliceous Aggregate

Granite

Felsic intrusive igneous rock (Granite)

Granite Pebble

Granite (Phaneritic Quartz-Feldspar Rock)

Sandstone (Quartzose)

Arenite (primarily SiO2)

Fossiliferous Limestone

Fossiliferous Limestone (containing bioclasts)

Colorless faceted gemstone (most likely synthetic cubic zirconia)

Cubic zirconia, ZrO₂ (likely synthetic); natural alternatives include quartz or diamond

Sandstone

Arenite (SiO2 primarily)

Sandstone (Quartz Sandstone)

Arenite (SiO2 based)

Chert (and Jasper/Flint variety)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Weathered brown stone, likely basalt or iron-stained volcanic rock

Indeterminate; possibly vesicular basalt (mafic silicate rock)

Granite

Granite (composed primarily of Quartz, Feldspar, and Mica)

Pegmatitic quartz–feldspar rock with dark mica

Granitic pegmatite; quartz (SiO₂), feldspar, and biotite mica

Vesicular basalt (likely scoria)

Basaltic volcanic rock; chiefly plagioclase, pyroxene, and olivine, with possible volcanic glass

Tumbled Agate (Carnelian/Sard)

Silicon Dioxide (SiO2)

Basalt

Mafic Volcanic Rock (composed of plagioclase, pyroxene, and olivine)

Red Jasper (beads)

Silicon Dioxide (SiO2) with iron inclusions

Quartzite (River Pebble)

Metamorphosed Quartz Sandstone (SiO2)

Beach sand with a dark pebble

Unconsolidated siliciclastic sediment, chiefly quartz and feldspar; dark pebble likely basalt or volcanic rock

Green Chalcedony (Green Agate)

Silicon Dioxide (SiO2)

N/A (This is a digital image of a bar graph)

Digital Data Visualization (Bar Chart)

Chert (Jasper/Flint variety)

Microcrystalline Quartz (SiO2)

Tumbled epidote or epidote-rich stone

Epidote, Ca₂(Al,Fe)₃(SiO₄)₃(OH); possibly a green jasper or prehnite-epidote aggregate

Quartzite

Quartzite

Metal Chain (Likely Steel or a Steel Alloy)

Steel (primarily iron and carbon); specific alloy unknown

Granite (Weathered/Oxidized)

Phaneritic Felsic Igneous Rock (composed of Quartz, Orthoclase Feldspar, and Mica)

Pink Granite Pebbles

Phaneritic Felsic Intrusive Rock (Granite)

Mica Schist

Mica Schist (Complex Silicate Rock)

Chert (Siliceous Siltstone/Quartzite)

Silicon dioxide (SiO2)

Chert (Jasper variety)

Silicon Dioxide (SiO2)

Quartz (likely milky/gray variety)

Quartz (SiO₂)

Basalt with Quartz/Calcite Vein

Basalt (Mafic Volcanic Rock with secondary mineralization)

Tumbled dark stone, likely basalt

Basalt; chiefly plagioclase feldspar, pyroxene, and minor olivine or iron oxides