Multiple

Tumbled turquoise cabochon

Turquoise, CuAl₆(PO₄)₄(OH)₈·4H₂O

Weathered quartz-rich rock, possibly granite or quartzite

Likely quartz–feldspar aggregate; exact identification is uncertain from the photograph

Unidentified gray mineral/rock fragment

Indeterminate from image; possibly quartz-rich material or mica-bearing schist

Polished jasper, likely ocean jasper or orbicular jasper

Jasper: microcrystalline quartz (SiO₂), commonly with chalcedony and iron-oxide inclusions

Pearl-bearing oyster shell

Nacreous shell, primarily aragonite (CaCO₃), with natural pearls (calcium-carbonate nacre)

Lapis Lazuli

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

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

Quartzite Pebble

Quartzite (SiO2)

Lapis Lazuli

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

Jasper with Quartz Vein

Microcrystalline Quartz (SiO2)

Quartz-veined Sandstone Pebble

Quartzite-veined Arenite

Quartzite Cobble

Metamorphosed Quartz Sandstone (primarily SiO2)

Ventifact

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

Quartzite Pebble

Quartzite (primarily SiO2)

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)

Fire Agate

SiO2 (Silicon Dioxide with Iron Oxide inclusions)

Agate Geode

Cryptocrystalline Quartz (SiO2)

Satin Spar (Gypsum)

Hydrous Calcium Sulfate (CaSO4·2H2O)

Orthoceras Fossil in Limestone

Orthoceras sp. in Bituminous / Organic Limestone (primarily Calcite, CaCO3)

Mixed beach-stone and tumbled-glass collection

Predominantly uncertain rocks (likely basalt, granite, and quartz-bearing stones) with anthropogenic glass; one possible banded agate or jasper

Quartzite Cobble

Quartzite (principally SiO2)

Quartzite River Rock

Metamorphic Rock (Quartzite)

Aragonite Star Cluster (Cross-section)

Aragonite (Calcium Carbonate, CaCO3)

Quartzite (River Cobble)

Quartzite (Metamorphosed Quartz Sandstone, SiO2)

Chert / River Pebble

Microcrystalline Silica (SiO2)

Amethyst ring

Amethyst, purple quartz (SiO₂), likely set with diamond or other accent stones

Likely polished dark stone or mineral specimen (unidentifiable from image)

Undetermined; possibly dark quartz-rich material, basalt, or obsidian

River Pebble (Gneiss/Schist mix)

Metamorphic rock aggregate

Quartzite Cobble

Quartzite (primarily SiO2)

Vein-bearing sandstone or quartzite cobble

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

Mixed rounded gravel and weathered rock fragments

Polymictic alluvial or glacial gravel; composition appears to include basaltic, quartz-rich, and feldspathic clasts

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

Riverstone Quartzite (Water-worn Siltstone/Quartzite)

Metamorphosed Quartz-rich Arenite (SiO2)

Unidentified dark, flat specimen

Indeterminate; image resolution is insufficient for mineral identification

Polished brecciated jasper

Jasper, an opaque microcrystalline variety of quartz (SiO₂), with iron-oxide and possibly manganese-rich inclusions

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

Silicon Dioxide (SiO2)

Jasper and Agate Mix

Silicon dioxide (SiO2) - Microcrystalline Quartz