Mixed (Predominantly Sedimentary And Igneous)

Rose Quartz and Pegmatite

Silicon Dioxide (SiO2) with trace amounts of titanium, iron, or manganese

Dalmation Stone

Peralkaline Rock (mixed silicate minerals)

Tumbled mixed mineral specimens, likely quartz-rich rocks

Predominantly quartz (SiO₂), with possible jasper, agate, feldspar, and iron-oxide minerals

Quartz (Engineered Quartz Surface)

Silicon Dioxide (SiO2) based composite

Mixed Gemstone Beaded Jewelry

Various minerals (e.g., Quartz varieties like Rose Quartz, Amethyst; Peridot; Garnet; etc.)

Mixed rock and mineral gravel

Predominantly granite/granodiorite, basaltic rocks, quartz, and possible gneiss; exact identification is uncertain from the image

Gravel / Crushed Stone

Aggregate (mixed mineral rock fragments)

Mossy Rock

Mixed lithology rock with Bryophyta (moss)

Rounded granitic pebble (likely granite or granodiorite)

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

Mixed Rock and Mineral Collection

Various geological specimens

Exposed aggregate concrete (stone-chip surface)

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

Faceted Gemstones (Mixed)

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

General Gravel (River Rock/River Stones)

Mixed Lithic Sediments (Conglomerate Clasts)

Pyrite

Iron Sulfide (FeS2)

Mixed tumbled rock and mineral collection

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

Rounded quartz-rich river pebbles

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

Mixed rounded rock and mineral gravel

Predominantly weathered basalt, quartz-rich fragments, and iron-stained silicate rocks; exact species cannot be determined reliably from the image

Unakite

Epidotized Granite

Clear Quartz Crystal

Silicon Dioxide (SiO2)

Fossil Assortment and Geological Specimens

Various (including Ammonoidea)

Tumbled Stone Collection (featuring Tiger's Eye, Rose Quartz, and Moss Agate)

Mixed Silicates and Oxides (predominantly SiO2 group minerals)

Educational Geologic Collection

Mixed Mineral and Rock Collection (Various compositions)

Sandstone

Clastic sedimentary rock, predominantly quartz (SiO₂) sand grains cemented by silica, calcite, or iron oxides

Mixed Rock and Mineral Collection

Mixed Assemblage (includes Quartz, Jasper, Feldspar, and Turquoise-colored stones)

Weathered volcanic rock fragment

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

Decorative mosaic cross containing mixed rock and glass fragments

Polychrome aggregate; likely quartz, feldspar, marble, granite, and assorted colored glass

Gravel and Sand Aggregate

Unconsolidated Clastic Sediment

Asphalt aggregate

Human-made bituminous asphalt containing crushed silicate rock aggregate

Granite or granitic gneiss pebble

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

Blue Calcite (commonly sold as Caribbean Calcite)

Calcium Carbonate (CaCO3)

Fluorite Bracelet

Calcium Fluoride (CaF2)

Mixed river stones; foreground likely sandstone

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

Raw Calcite

Calcium Carbonate (CaCO3)

Concrete or asphalt-like aggregate surface with a dark fragment

Uncertain; likely artificial concrete containing mixed lithic aggregate, not a natural rock

Pyrite

Iron Sulfide (FeS2)

Red Jasper

Silicon Dioxide with Iron Oxide inclusions (SiO2)

Migmatite

Migmatite (Mixed Rock)

Iron-stained milky quartz

Quartz (SiO₂), with iron-oxide staining

Mixed tumbled stones

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

River Pebbles and Quartz

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

Mixed Mineral and Rock Collection

Mixed geological specimens (Quartz, Amethyst, Rose Quartz, Jasper, Epidote, Chert)

Mookaite Jasper

Siliceous sedimentary rock (variety of Jasper/Chert)