Sedimentary And Igneous (Mixed)

Crushed Stone (Gravel/Aggregates)

Crushed rock aggregate (varied composition including Granite, Limestone, and Quartz)

Jasper and Basalt (Mixed Breccia or Chert)

Silicon Dioxide (SiO2) with Ferromagnesian silicates

Rock and Mineral Collection

Mixed Geological Specimens

Mixed Tumbled Gemstones and Minerals

Various silicate and oxide minerals

Mixed Rock Collection (Pebbles and Stones)

Various geological specimens

Mixed Rock and Mineral Collection

Multiple geological specimens

Quartz with Calcite

Silicon Dioxide and Calcium Carbonate (SiO2 + CaCO3)

Mixed Rock Collection

Polylithic Geological Specimen Mix

Granite or Granitic Gneiss

Granitoid / Gneiss

Tumbled Mixed Gemstones and Rocks

Various mineral species including quartz (SiO2) and silicate minerals

Mixed Mineral Collection

Multi-mineral Assemblage (Quartz, Jasper, Obsidian, Pyrite, etc.)

Dalmation Stone

Peralkaline Rock (mixed silicate minerals)

Gravel (Crushed Stone Aggregates)

Mixed Siliciclastic / Carbonate Aggregate

Quartz-rich rock fragment

Unidentified quartz–feldspar-rich rock; exact lithology cannot be determined from the image

Mixed Tumbled Rocks and Minerals Collection

Mixed Minerals and Rocks (Quartz, Feldspar, Jasper, Agate, Lapis Lazuli, Sodalite, Rose Quartz, Fluorite, etc.)

Quartz and Mixed Minerals

Silicon Dioxide (SiO2)

Granitic Gravel and Soil

Regolith / Alluvial sediment

Mixed Tumbled Gemstones

Various silicate and oxide minerals

Rounded granitic pebble (likely granite or granodiorite)

Granite–granodiorite; chiefly quartz, feldspar, and mica/amphibole

Tumbled clear quartz

Quartz (SiO₂)

Gravel / Crushed Stone

Aggregate (mixed mineral rock fragments)

Mossy Rock

Mixed lithology rock with Bryophyta (moss)

Milky quartz

Quartz (silicon dioxide, SiO₂)

Beaded Gemstone Bracelet

Composite Mineral Assemblage

Mixed tumbled rock and mineral collection

Varied specimens, including probable quartz varieties, jasper, agate, fluorite, rose quartz, amethyst, pyrite, calcite, and others

Mixed Mineral and Crystal Assortment

Various silicate and oxide minerals

Faceted Gemstones (Mixed)

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

Exposed aggregate concrete (stone-chip surface)

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

Granite or granitic gneiss pebble

Quartz–feldspar–mica aggregate; likely granite, possibly foliated gneiss

Mixed river stones; foreground likely sandstone

Quartz-rich sandstone, with associated rounded quartzite/chert and other cobbles

Educational Geologic Collection

Mixed Mineral and Rock Collection (Various compositions)

General Gravel (River Rock/River Stones)

Mixed Lithic Sediments (Conglomerate Clasts)

Pyrite

Iron Sulfide (FeS2)

Mixed River Pebbles

Clastic Sedimentary Alluvial Deposit / Polymictic Conglomerate Clasts

River Pebbles and Quartz

Mixed Igneous, Sedimentary, and Metamorphic Rocks (Silicon Dioxide SiO2 dominant)

Rounded quartz-rich river pebbles

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

Beach Pebbles and Shells

Mixed Lithology Sedimentary Clasts and Biogenic Carbonate

Dalmatian Stone (commonly called Dalmatian Jasper)

Peralkaline Rock (mixed Feldspar, Quartz, and Arfvedsonite)

Fluorite Bracelet

Calcium Fluoride (CaF2)

Mixed Rock and Mineral Collection

Various geological specimens

Asphalt aggregate

Human-made bituminous asphalt containing crushed silicate rock aggregate

Pyrite

Iron Sulfide (FeS2)