Mixed

Venetian Gold Granite

Phaneritic Felsic Igneous Rock (Granite)

Granite

Granite (Plutonic Igneous Rock)

Gravel and Pavement Aggregates

Unconsolidated rock fragments / detrital sediments

Unakite

Epidotized Granite

Pink Granite

Phaneritic Felsic Igneous Rock

Assorted Decorative Tumbled Stones (Quartz, Sodalite, Aventurine, Calcite)

Mixed Silicates and Carbonates (SiO2, Na8(Al6Si6O24)Cl2, CaCO3)

Dyed and polished gemstone chips

Mostly chalcedony (microcrystalline quartz, SiO₂), with probable amethyst and agate varieties

Pyrite in Quartz

FeS2 (Iron Pyrite) with SiO2 (Quartz)

Granite fragment

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

Pink Granite

Phaneritic intrusive igneous rock (Granite)

Granite

Felsic intrusive igneous rock

Lapis Lazuli

Lapis Lazuli (Rock containing lazurite, calcite, and pyrite)

Pink Granite

Phaneritic intrusive igneous rock (Granite)

Pink Granite (Gneissic Granite)

Granite (composed primarily of Quartz, K-Feldspar, and Plagioclase)

Lapis Lazuli

Lapis lazuli (complex rock composed of Lazurite, Calcite, and Pyrite)

Unakite

Unakite (Metasomatized Granodiorite)

Jasp-Agate

Cryptocrystalline Quartz (SiO2) with Iron Oxide inclusions

Rhodonite

Manganese Silicate (Mn,Fe,Mg,Ca)SiO3

Granodiorite

Granodiorite (containing Plagioclase, Quartz, K-Feldspar, and Hornblende or Biotite)

Pink Granite

Granite (rich in Potassium Feldspar/Orthoclase)

Chrysocolla in Quartz

Chrysocolla (Cu,Al)2H2Si2O5(OH)4·nH2O in Quartz (SiO2)

Weathered quartz-rich pebble, possibly quartzite or granite fragment

Quartzite (mostly SiO₂), though the specimen may contain feldspar and other silicates

Chrysocolla

Chrysocolla (Cu2–xAlx(H2–xSi2O5)(OH)4·nH2O)

Conglomerate

Conglomerate

Blue Calcite (commonly sold as Caribbean Calcite)

Calcium Carbonate (CaCO3)

Granite

Phaneritic Igneous Rock (primarily Quartz, Feldspar, and Mica)

Dalmatian Stone (Dalmatian Jasper)

Peralkaline Quartz-Feldspar Porphyry with Arfvedsonite

Chrysocolla

Chrysocolla (Cu2-xAlx(H2-xSi2O5)(OH)4 · nH2O)

Mixed Mineral Specimens

Mixed Silicates, Oxides, and Phosphates (SiO₂, Ca₅(PO₄)₃(F,Cl,OH), Na₈Al₆Si₆O₂₄Cl₂, etc.)

Weathered quartz-bearing rock fragment

Indeterminate; likely quartz-rich granite, gneiss, or pegmatitic rock

Rounded quartz-rich river pebbles

Alluvial gravel; commonly quartzite, chert, and quartz-bearing sandstone fragments

Conglomerate

Polymictic conglomerate; clast-bearing sedimentary rock cemented by silica, calcite, or iron oxides

Weathered volcanic rock fragment

Likely andesite or basaltic-andesite; exact identification requires fresh surface and testing

Exposed aggregate concrete (stone-chip surface)

Portland-cement concrete containing natural aggregate; not a natural rock

River Pebbles (including Granite and Basalt)

Mixed Igneous Rocks (Granite, Basalt)

Copper Ore

Cupriferous Rock / Mixed Mineral Matrix

Polygenetic Conglomerate (Puddingstone)

Conglomerate (SiO2 matrix with mixed clasts)

General Gravel (River Rock/River Stones)

Mixed Lithic Sediments (Conglomerate Clasts)

Quartz with impurities or Host Rock

SiO2 (Silicon Dioxide) with mixed silicates

Dalmation Stone

Peralkaline Rock (mixed silicate minerals)

Gossan (Iron Cap)

Limonitic Gossan (Fe2O3·nH2O mixed)

Gravel / Crushed Stone

Aggregate (mixed mineral rock fragments)