Mixed (Predominantly Sedimentary And Igneous)

Mixed Quartz and River Pebbles (Stone Collection)

Mixed assortment containing mainly Silicon Dioxide (SiO2)

Granodiorite

Granodiorite (phaneritic intrusive igneous rock)

Polished agate or jasper cabochon

Cryptocrystalline quartz, SiO₂, possibly iron-rich jasper inclusions

Mixed polished/tumbled stones; likely blue calcite, red carnelian, and gray/blue quartz or agate

Probable calcite (CaCO₃), chalcedony/quartz (SiO₂), and iron-colored chalcedony

Biotite-rich schist (likely mica schist)

Mica schist; predominantly quartz, biotite mica, and feldspar

Mixed Tumbled Stones Collection

Mixed Silicates and Carbonates (Quartz, Amorphous Silica, Carbonates)

Pyrite (on Quartz/Host Rock)

Iron Sulfide (FeS₂)

Amethyst

Silicon dioxide (SiO2) with iron impurities

Tumbled blue sodalite beads

Sodalite, Na₈(Al₆Si₆O₂₄)Cl₂, likely with white albite or calcite veining

Mixed Mineral and Fossil Collection

Multi-specimen assemblage (SiO2, CaCO3, FeS2, etc.)

Blue-green tumbled stone, possibly chrysocolla-bearing material

Uncertain from image; likely chrysocolla (hydrated copper silicate, variably written Cu₂H₂Si₂O₅(OH)₄·nH₂O), possibly mixed with quartz or other copper minerals

Polished carnelian agate

Microcrystalline quartz (SiO₂), chalcedony with iron-oxide coloration

Carnelian

Carnelian (Silicon Dioxide - SiO2)

Unakite

Epidotized Granite

Vein-filled Sedimentary Rock

Silicified sedimentary rock with quartz/calcite vein

K-Feldspar (Potassium Feldspar)

Potassium Feldspar (Microcline or Orthoclase), KAlSi3O8

Gneiss

Metamorphic Gneiss (High-grade regional metamorphism)

Flint (Chert Flake / Drill Tool)

SiO2 (Microcrystalline Quartz)

Granite

Felsic Intrusive Igneous Rock

Milky quartz rough chips

Quartz (silicon dioxide, SiO₂)

Likely anthracite coal fragments

Anthracite; predominantly carbon (C), with minor mineral ash

Coarse-grained granite

Granite; predominantly quartz, potassium feldspar, plagioclase, and biotite/hornblende

Sandstone (with Iron Staining)

Arenite (SiO2 predominantly)

Sandstone

Arenite (predominantly SiO2)

Sandstone

Sandstone (SiO2 rich)

Sandstone

Sedimentary Clastic Rock

Sandstone (Weathered / Crushed)

Quartz Sandstone

Quartz-rich granite or granitic pegmatite

Granite; predominantly quartz (SiO₂), feldspar, and possibly mica

Tumbled jasper or chalcedony pebble

Microcrystalline quartz (SiO₂), likely jasper/chalcedony with iron-oxide staining

Caribbean Calcite

Aragonite and Calcite (CaCO3)

Moonstone (specifically Rainbow Moonstone / White Labradorite)

White Labradorite (Feldspar Group: (Na,Ca)(Al,Si)4O8)

Almandine Garnet

Almandine (Fe3Al2(SiO4)3)

Rounded pebble, likely mixed lithology

Lithology uncertain; possibly a fine-grained metamorphic or volcanic rock with a quartz-rich/pink feldspar vein or inclusion

Mixed beach-stone collection, primarily quartz-rich pebbles and possible fossils

Likely quartz (SiO₂), quartzite, chert, and carbonate rock; exact identification is uncertain from the image

Mixed weathered field rocks, likely sandstone and shale/slate

Indeterminate clastic rocks; possible quartz-rich sandstone with laminated shale or slate

Mixed River Pebbles and Rock Collection

Polymictic lithic conglomerate, sandstone, and quartz pebbles

Breccia

Lithic breccia (angular rock fragments cemented in a finer matrix)

Sandstone (likely Quartzose Sandstone)

Arenite (SiO2 predominantly)

Granite Pebble

Intrusive Igneous Rock

Granite

Intrusive Igneous Rock

Colorless faceted gemstone (likely cubic zirconia)

Cubic zirconia, zirconium dioxide (ZrO₂); possibly synthetic quartz or glass imitation

Tektite (Indochinite)

Tektite (Natural silica glass)