Mixed

Mixed polished gemstones and minerals

Likely agate/chalcedony (SiO₂), quartz, jasper, and possibly aventurine or obsidian; exact identification requires individual testing.

Graphite

Graphite (Native Carbon, C)

Polished mixed rock, likely orbicular/epidote-bearing granite or basalt

Uncertain; probable quartz–feldspar–amphibole/epidote aggregate

Tumbled brown banded agate beads

Agate, a banded variety of microcrystalline quartz (SiO₂)

Dyed, polished stone beads (likely assorted agate or jasper)

Microcrystalline quartz, SiO₂ (chalcedony; exact stones cannot be determined from the image)

Chrysocolla with Malachite

Cu2-xAlx(H2-xSi2O5)(OH)4%CnH2O (Chrysocolla)

Sodalite

Sodalite (Na8(Al6Si6O24)Cl2)

Chrysocolla (carved)

Cu2-xAlx(H2-xSi2O5)(OH)4·n(H2O)

Pink Granite

Phaneritic Felsic Igneous Rock

Banded River Cobble with Mafic Dike

Hydrothermally altered Graywacke or Sandstone with Mafic Intrusion

Mahogany Obsidian

Volcanic Glass (SiO2 with Hematite/Magnetite inclusions)

Unakite

Unakite (altered granite)

Azurite Malachite

Azurite (Cu3(CO3)2(OH)2) and Malachite (Cu2CO3(OH)2)

Conglomerate

Conglomerate (clastic sedimentary rock)

Conglomeratic gravel / lithified alluvial deposit

Polymictic conglomerate or pebble-rich sandstone (likely weakly cemented)

Mixed Tumbled Gemstones

Various silicate and oxide minerals

Mixed gemstone specimens

Likely pink sapphire or tourmaline, red garnet, blue sapphire, precious opal, and green tourmaline/emerald; exact identities cannot be confirmed from the collage

Mixed rock collection

Labeled specimens appear to include iron-rich rock, schist, basalt, serpentinite, and shale

Mixed tumbled stones

Mixed aggregate of quartz, chalcedony, jasper, feldspar, and other common silicate minerals

Mixed Gemstones and Minerals

Mixed Silicates and Oxides (Quartz/Amethyst, Aventurine, Sodalite, Chert, Jasper)

Carnelian and Mixed Agates

Cryptocrystalline Quartz (SiO2 with Iron Oxide impurities)

Mixed River Pebbles

Clastic Sedimentary Alluvial Deposit / Polymictic Conglomerate Clasts

Tourmaline (Mixed colors)

Boron silicate mineral (Na,Ca)(Li,Mg,Al,Fe,Mn,Ti,V,Cr)3Al6(BO3)3Si6O18(OH,F)4

Mixed Crushed Stone

Aggregate (varied mineral composition)

Mixed River Pebbles

Polymictic quartz and silicate pebble aggregate

Quartz and Mixed Minerals

Silicon Dioxide (SiO2)

Mixed River Pebbles

Polylithic rock fragments

Mixed rounded gravel

Unsorted polymictic gravel; individual clasts likely include quartz, granite, gneiss, and other common rocks

Mixed Mineral Collection

Multiple Mineral Species (Silicates and Oxides)

Mixed Mineral Collection

Various Silicates and Oxides

Faceted Gemstones (Mixed)

Various (e.g., Corundum, Beryl, Quartz, or synthetic equivalents)

Mixed tumbled stones

Mixed mineral specimens; visible pieces may include quartz, feldspar, calcite, and other silicates

Mixed Gravel and Pebbles

Polylithic Alluvial Aggregate

Pegmatite fragment

Granitic pegmatite, composed mainly of quartz, feldspar, and mica

Likely gabbro or diabase

Mafic igneous rock, chiefly plagioclase feldspar and pyroxene; possible olivine and amphibole

Likely weathered granite or granitic gneiss

Granite: quartz + feldspar + mica; possibly gneiss if the faint banding is structural

Biotite-bearing mica schist (probable)

Mica schist, chiefly quartz + muscovite/biotite; composition is uncertain from the photograph

Granite Pebble (Pegmatitic Quartz-Feldspar River Rock)

Granite / Quartz-Feldspar-Mica Aggregate

Amethyst (Chevron or Banded Amethyst)

Silicon Dioxide (SiO2) with Fe3+ impurities

Red Granite

Granite (Felsic Plutonic Rock)

Quartz and Mixed Gravel

Silicon Dioxide (SiO2) with minor impurities

Mixed Gemstone Bracelet

Mixed natural minerals and rocks (e.g., Rhodonite, Malachite, Sodalite, Rose Quartz, Black Tourmaline, Quartz/Chalcedony variants)