Multiple

Fancy Jasper (Butterfly Carving)

Silicon Dioxide (SiO2) with iron and manganese inclusions

Ocean Jasper

Silicon Dioxide (SiO2) with various inclusions

Bivalve Fossil (Shell-bearing Sedimentary Rock)

Class Bivalvia (Phylum Mollusca) within a Calcarenite/Sandstone matrix

Mixed rock and mineral collection

Mixed lithologies; likely quartz, feldspar, basalt, granite, chert, sandstone, and metamorphic rocks

Botryoidal Chalcedony (Desert Rose Agate)

Silicon Dioxide (SiO2)

Knightia Fossil in Limestone

Knightia eocaena in micritic limestone

Fossiliferous Limestone with Crinoid Stem Impression

Calcium Carbonate (CaCO3) matrix with Crinoidea fossil

Banded metamorphic river cobble, likely gneiss or metasedimentary rock

Quartz–feldspar–mica gneiss or quartzite with cross-cutting quartz veins

Quartz-bearing feldspathic rock, likely weathered granite or pegmatite

Granite/pegmatite; chiefly quartz (SiO₂) and feldspar, with possible mica

Jasper with Quartz Vein

Microcrystalline Quartz (SiO2)

Quartz-veined Sandstone Pebble

Quartzite-veined Arenite

Lapis Lazuli

Lapis Lazuli (Complex silicate rock containing Lazurite: (Na,Ca)8(AlSiO4)6(S,Cl,SO4,OH)2)

Quartzite Pebble

Quartzite (SiO2)

Lapis Lazuli

Lazurite (primary mineral component), (Na,Ca)8(AlSiO4)6(S,SO4,Cl)1-2

Quartzite Cobble

Metamorphosed Quartz Sandstone (primarily SiO2)

Ventifact

Eolian Ventifact (often composed of basalt, chert, or quartzite)

Quartzite Pebble

Quartzite (primarily SiO2)

Desert Rose (Baryte/Gypsum Rosette)

Baryte (BaSO4) or Gypsum (CaSO4·2H2O)

Aragonite Star Cluster (Cross-section)

Aragonite (Calcium Carbonate, CaCO3)

Quartzite Cobble

Quartzite (principally SiO2)

Quartzite River Rock

Metamorphic Rock (Quartzite)

Quartzite (River Cobble)

Quartzite (Metamorphosed Quartz Sandstone, SiO2)

Chert / River Pebble

Microcrystalline Silica (SiO2)

Milky Quartz Pebble

Quartz (Silicon Dioxide, SiO2)

White-and-dark marble or agate-style gemstone bead bracelet

Likely calcite-rich marble (CaCO₃) mixed with dark gray stone beads; exact material is uncertain from the photo

Banded gneiss (possibly migmatitic gneiss)

Quartz–feldspar–mica gneiss; composition commonly includes quartz, feldspar, biotite/hornblende, and accessory dark minerals

Vein-bearing sandstone or quartzite cobble

Quartz-rich sandstone with white quartz veins; possibly metamorphosed to quartzite

River Pebble (Gneiss/Schist mix)

Metamorphic rock aggregate

Quartzite Cobble

Quartzite (primarily SiO2)

Riverstone Quartzite (Water-worn Siltstone/Quartzite)

Metamorphosed Quartz-rich Arenite (SiO2)

Jasper and Agate Mix

Silicon dioxide (SiO2) - Microcrystalline Quartz

Quartz Crystal Cluster (Pipe-like or Candle Quartz Growth)

Silicon Dioxide (SiO2)

Chert / Jasper

Sedimentary Cryptocrystalline Quartz (SiO2)

Unakite

Epidotized Granite

Yellow Quartzite (Onyx Pebble)

Silicon Dioxide (SiO2) - Quartzite

Agate Geode

Cryptocrystalline Quartz (SiO2)

Satin Spar (Gypsum)

Hydrous Calcium Sulfate (CaSO4·2H2O)

Eye Agate

Chalcedony (Silicon Dioxide, SiO2)

Chert (Hag Stone / Hole Stone)

Chert (Cryptocrystalline variety of Quartz, SiO2)

Fossilized Turritella Gastropod (Internal Mold)

Turritella (Fossil Gastropod Crust)

Crinoid Stem Fossil

Class Crinoidea (Phylum Echinodermata), primarily Calcium Carbonate (CaCO3)

Unidentified dark, flat specimen

Indeterminate; image resolution is insufficient for mineral identification