Mixed (Predominantly Sedimentary And Igneous)

River Rock (Glacial Cobbles)

Fluvial Alluvium (Mixed lithology including Quartzite, Basalt, and Granite)

River Pebbles (Stream-rounded rocks)

Fluvial Detritus (varied mineralogy)

Mixed River Pebbles

Clastic Sedimentary Alluvial Deposit / Polymictic Conglomerate Clasts

Crushed Stone / Gravel

Aggregate (mixed lithology)

Tiffany Stone

Fluorite-bearing Opalized Breccia

Granite

Felsic intrusive igneous rock

Mixed Mineral Collection (with Titanium Aura Quartz)

Silicon Dioxide (SiO2) with metallic coatings and various silicates

Granite (Pink/Alkali Feldspar Granite)

Plutonic Igneous Rock (Granite)

Mixed mineral and rock collection

Predominantly quartz varieties, including amethyst, plus likely calcite, feldspar, mica, and miscellaneous polished stones

Engineered Quartz Stone

Agglomerated Quartz (SiO2 + Polymer Resin)

Conglomeratic volcanic breccia

Lithic volcanic breccia, likely andesitic or basaltic

Glacial Cobbles (predominantly Granite and Gneiss)

Mixed lithologies (Quartz, Feldspar, Mica assemblage)

Mixed Rock Collection

Polylithic Geological Specimen Mix

Weathered quartzite cobble

Quartzite, predominantly crystalline SiO₂

Mixed Rock Collection (Pebbles and Stones)

Various geological specimens

River Pebbles and Cobbles

Mixed Siliciclastic Sediments (Quartzite, Chert, and Sandstone clasts)

Weathered granite pebble

Granite, predominantly quartz–feldspar–mica aggregate

Granite or Granitic Gneiss

Granitoid / Gneiss

Tumbled Mixed Gemstones and Rocks

Various mineral species including quartz (SiO2) and silicate minerals

Connemara Marble

Calcitic Marble / Serpentinite composite

Tumbled yellow-brown quartzite or jasper

Quartzite, predominantly microcrystalline quartz (SiO₂), possibly iron-stained jasper

Mixed rock and mineral specimens

Predominantly quartz-rich rocks, with a possible malachite-bearing specimen; exact identification is uncertain from the image

Mixed Tumbled Gemstones and River Rocks

Mixed Decorative Stones (predominantly Silicon Dioxide - SiO2 variants)

Amethyst (Chevron or Banded Amethyst)

Silicon Dioxide (SiO2) with Fe3+ impurities

Mixed Mineral Collection

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

Amethyst (Raw Quartz)

Silicon Dioxide (SiO2)

Rose Quartz and Pegmatite

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

Mixed Tumbled Rocks and Minerals Collection

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

Mixed stream gravel and common rock specimens

Predominantly quartz-rich granitoid, quartzite, sandstone, shale/slate, and mafic volcanic fragments; exact species cannot be determined confidently from the image

Quartz (Engineered Quartz Surface)

Silicon Dioxide (SiO2) based composite

Gravel (Crushed Stone Aggregates)

Mixed Siliciclastic / Carbonate Aggregate

Dalmation Stone

Peralkaline Rock (mixed silicate minerals)

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

Exposed aggregate concrete (stone-chip surface)

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

Mixed Rock and Mineral Collection

Various geological specimens

Pyrite

Iron Sulfide (FeS2)

Unakite

Epidotized Granite

Gravel / Crushed Stone

Aggregate (mixed mineral rock fragments)

Mossy Rock

Mixed lithology rock with Bryophyta (moss)

Fluorite Bracelet

Calcium Fluoride (CaF2)

Pyrite

Iron Sulfide (FeS2)