Igneous, Sedimentary, And Metamorphic Mix

Mixed Gravel and Pebbles

Polylithic Alluvial Aggregate

Crushed Stone / Gravel (Multiple Rock Types)

Lithic fragments (undifferentiated)

Pebble Gravel Mix (Quartzite, Basalt, Chert)

Alluvial River Gravel / Aggregate Clasts

Quartz Pebble

Silicon Dioxide (SiO2)

Magnetite / Hematite mix

Magnetite (Fe3O4) and Hematite (Fe2O3)

Gravel / Crushed Stone

Aggregate (mixed mineral rock fragments)

Exposed aggregate concrete (stone-chip surface)

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

Healer's Gold (Pyrite and Magnetite in Schist)

Magnetite (Fe3O4) and Pyrite (FeS2) in Mica Schist

Sand and Gravel (Quartz-rich)

Unconsolidated fluvial/beach sediment (primarily Silica/SiO2)

Lava Stone and Chakra Beads

Basalt (with various mineral/synthetic beads)

Faceted Gemstones (Mixed)

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

Quartz Pebble

Silicon Dioxide (SiO2)

River Pebble (Gneiss/Schist mix)

Metamorphic rock aggregate

Mixed River Pebbles

Clastic Sedimentary Alluvial Deposit / Polymictic Conglomerate Clasts

Magnetite / Hematite mix (Iron Ore)

Fe3O4 (Magnetite) / Fe2O3 (Hematite)

Mixed Tumbled Rocks and Minerals Collection

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

River Cobble (Gneiss/Schist mix)

Foliated Metamorphic Rock (Gneissic/Schistose)

Mixed Rock Collection

Polylithic Geological Specimen Mix

Mixed Rock and Mineral Collection

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

River Pebbles and Quartz

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

Quartz (Raw and Water-worn)

Silicon Dioxide (SiO2)

Mixed Quartz and River Pebbles (Stone Collection)

Mixed assortment containing mainly Silicon Dioxide (SiO2)

Amethyst (Chevron or Banded Amethyst)

Silicon Dioxide (SiO2) with trace Iron (Fe)

Tumbled quartz pebble (probable)

Quartz, silicon dioxide (SiO₂)

Unakite

Epidotized Granite

River Rock (Gneiss/Schist mix)

Foliated Metamorphic Rock (Gneiss)

Mica Schist

Mica Schist (contains muscovite/biotite, quartz, plagioclase)

Rhodolite Garnet

Magnesium Aluminum Silicate; formula: (Mg,Fe)3Al2(SiO4)3

Mixed Tumbled Gemstones and River Rocks

Mixed Decorative Stones (predominantly Silicon Dioxide - SiO2 variants)

Orange Calcite (likely polished specimen)

Calcite

Yellow Quartz (Citrine/Yellow Jasper mix)

Silicon Dioxide (SiO2)

Yellow Quartzite (River Pebble)

Metamorphic Quartzite (primarily SiO2)

Serpentinite

Serpentinite, a rock composed mainly of serpentine-group minerals (approximately Mg₃Si₂O₅(OH)₄)

Pietersite

Brecciated Crocidolite in Quartz (Chalcedony)

Mica-rich metamorphic rock (likely mica schist)

Mica schist, composed mainly of muscovite and/or biotite with quartz and possibly feldspar

Greenstone (Greenschist facies)

Greenschist (composed primarily of Chlorite, Actinolite, and Epidote)

Tumbled milky quartz

Quartz (silicon dioxide, SiO₂)

Milky quartz crystal cluster

Quartz (silicon dioxide, SiO₂)

Likely milky quartz

Quartz (silicon dioxide, SiO₂)

Granitoid (Granite/Gneiss mix)

Granite or Granitic Gneiss (Silicon dioxide SiO2 with Al, K, Na silicates)

Greenstone (Prase / Nephrite / Serpentine mix)

Metamorphosed ultramafic rock / greenstone facies

Jasper, Agate, Quartz Mix (Polished Beads)

SiO₂ (Silicon Dioxide) for Quartz. Jasper and Agate are cryptocrystalline varieties of Quartz.