Sedimentary (Man Made Conglomerate)

Iron-rich sandstone or weathered ironstone cobble

Ferruginous sandstone; primarily quartz (SiO₂) cemented or stained by iron oxides such as hematite and goethite

Polymict breccia

Lithic breccia; clast-rich, iron-stained breccia

Brecciated quartz-rich rock, possibly silicified breccia

Silica-rich breccia; chiefly microcrystalline quartz (SiO₂), with possible calcite and iron-oxide staining

Sandstone Concretion

Sedimentary concretion

Quartz Pebble (Quartzite Pebble)

Silicon Dioxide (SiO2)

Mixed River Pebbles

Clastic Sedimentary Alluvial Deposit / Polymictic Conglomerate Clasts

Ferruginous Sandstone (with Pyrite/Gold associations)

Ferruginous Arenite (SiO2 + Fe2O3)

Weathered conglomeratic or breccia cobble

Lithified polymictic conglomerate/breccia, likely iron-stained siliciclastic rock

Rounded sandstone pebble

Sandstone, commonly quartz–feldspar-rich arenite

Bumblebee Jasper

Calcite with Arsenic and Sulfur inclusions

Unidentified brown rock fragment

Indeterminate from image; likely a weathered iron-rich lithic fragment

Fossiliferous limestone

Bioclastic limestone (calcite-rich carbonate rock)

Breccia

Clastic Breccia

Conglomeratic gravel / polymictic breccia

Polymictic rudite, likely anthropogenic or beach/stream gravel; composition varies

Jewelry Chain with Blue and Clear Gemstones (Likely Cubic Zirconia)

Cubic Zirconia (ZrO₂), Silver or White Gold/Platinum Alloy

Tiger Iron

Tiger Iron (composite of Tiger's Eye, Red Jasper, and Hematite)

Chert (likely flint)

Microcrystalline quartz, SiO₂

Quartz Pebble

Silicon Dioxide (SiO2)

Conglomeratic or porphyritic basalt cobble

Likely vesicular basalt with weathered feldspar/mafic inclusions; exact identification requires testing

Fossiliferous conglomeratic sandstone

Clastic sedimentary rock, likely quartz–feldspar sandstone with lithic granules and shell/bioclastic fragments

Turquoise

Hydrated phosphate of copper and aluminum, CuAl6(PO4)4(OH)8·4H2O

Conglomeratic sandstone or breccia specimen

Quartz-rich clastic sedimentary rock; likely sandstone with pebble-sized quartz, feldspar, and lithic clasts

Quartz-rich polymict conglomerate (possibly hydrothermal breccia)

Clast-supported polymict conglomerate dominated by quartz; includes chalcedony/quartz and dark lithic clasts

Garnet-bearing Schist / Conglomerate Specimen

Metamorphic rock with almandine garnet porphyroblasts

Rounded quartz-rich pebble

Likely milky quartz or quartzite; SiO₂

Breccia

Breccia (Clastic Sedimentary Rock)

Breccia

Breccia (Sedimentary Clastic Rock)

Man-made Green Quartz (Lab-grown or Treated)

Silicon Dioxide (SiO2) with artificial coloration

Quartz Pebble

Silicon Dioxide (SiO2)

Chert breccia

Sedimentary Breccia (Microcrystalline Quartz)

Fossil Shark Tooth

Lamniform (Mackerel Shark) fossil tooth, likely Otodus or Cretalamna

Quartz-rich breccia or conglomerate

Siliciclastic breccia/conglomerate, likely containing quartz and iron-oxide-stained rock fragments

Grey Chalcedony

Silicon Dioxide (SiO2)

Polymict breccia

Volcanic breccia (clast-rich pyroclastic rock), compositionally likely andesitic to basaltic

Sandstone (Pebble/Conglomerate fragment)

Sandstone (clastic sedimentary rock)

Rounded yellow sandstone pebble

Quartz-rich sandstone, likely ferruginous or calcareous sandstone

Mixed gravelly conglomeratic road aggregate

Polymictic clast-supported conglomerate or fill; composition varies, commonly quartz, feldspar, basalt, and weathered rock fragments

Goldstone (blue/black aventurine glass)

Man-made aventurine glass; silica glass containing metallic copper or other glittering inclusions

Small clear crystal, possibly quartz or glass-like gemstone

Uncertain; likely quartz (SiO₂), but the image is insufficient to exclude man-made glass or cubic zirconia

Tiger Shark Fossil Tooth

Galeocerdo cuvier (fossilized)

Quartzite

Quartzite (primarily SiO2)

Quartz-rich conglomeratic sandstone

Lithic arkose/conglomerate, dominated by quartz and feldspar grains