Quartz-rich rock, possibly milky quartz or quartzite
Quartz (SiO₂), potentially quartzite if the grains are fused
mineral
Category
Mineral Description (Anthropogenic Material)
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Quartz and Mixed Sedimentary Rocks
Silicon Dioxide (SiO2) mixed with various clastic sedimentary lithologies
sedimentary
Likely quartz-rich metamorphic rock (quartzite or milky quartz)
Quartzite; predominantly quartz (SiO₂), possibly with feldspar and iron-oxide staining
metamorphic
Travertine
Calcium Carbonate (CaCO3)
sedimentary
Tumbled Dalmatian jasper
Quartz-rich alkali rhyolite, commonly marketed as Dalmatian jasper; chiefly quartz, feldspar, and dark amphibole/biotite inclusions
igneous
Quartz Pebble
Silicon Dioxide (SiO2)
sedimentary
Red Sandstone
Arenite with Iron Oxide (Hematite) cement
sedimentary
Tumbled smoky quartz
Quartz (SiO₂), smoky variety
mineral
Translucent agate/chalcedony
Microcrystalline quartz (SiO₂), likely chalcedony with agate-like banding
mineral
Labradorite (Polished Crystal Point)
Labradorite (a calcium-enriched feldspar mineral), (Ca, Na)(Al, Si)4O8
mineral
Unidentified gray stone
Likely quartz-rich stone; exact identification is not possible from the image
mineral
Tumbled amethyst
Quartz, silicon dioxide (SiO₂), purple variety colored mainly by iron impurities and irradiation
mineral
Chalcedony (gray-white agate)
Microcrystalline quartz, SiO₂
mineral
Dyed Crackle Quartz
Silicon Dioxide (SiO2) with artificial dye
mineral
Diamond
Diamond (C)
mineral
Diamond (Macled/Crystal fragment)
Carbon (C), isometric crystal system
mineral
Milky quartz
Quartz (silicon dioxide, SiO₂)
mineral
Greenstone with Epidote or Quartz veins
Metabasalt (Greenstone facies)
metamorphic
Diamond
Carbon (C)
mineral
Travertine (Tufa)
Chemical Limestone (CaCO3)
sedimentary
Orbicular jasper (likely ocean jasper)
Silica-rich microcrystalline quartz/chalcedony with iron-oxide and other mineral inclusions; SiO₂
mineral
Green aventurine (likely)
Quartz variety; silicon dioxide (SiO₂) with green fuchsite mica inclusions
mineral
Tumbled ruby-bearing corundum
Corundum (Al₂O₃), likely ruby variety
mineral
Sandstone
Quartzose Sandstone / Lithic Sandstone
sedimentary
Pink Granite
Granite (Felsic Plutonic Igneous Rock)
igneous
Granite Gneiss
Gneiss (High-grade Metamorphic Rock)
metamorphic
Schist
Schist (Crystalline metamorphic rock)
metamorphic
Sandstone with Manganese Oxide Patina
Clastic Sedimentary Rock (primarily SiO2)
sedimentary
Quartz Pebble
Silicon Dioxide (SiO2)
sedimentary
Petrified Wood
Silicified wood (primarily quartz, SiO2)
fossil
Petrified Wood
Silicified Wood (SiO2)
sedimentary
Petrified Wood
Silicified Wood (Per mineral content: SiO2, Quartz/Chalcedony)
fossil
Fossilized Coral
Anthozoa (Fossilized)
Sedimentary / Fossil
Sandstone (with Iron Staining)
Quartz Arenite / Ferruginous Sandstone
sedimentary
Agate (Chalcedony)
Silicon Dioxide (SiO2)
mineral
Sandstone (Ferruginous)
Arenite (primarily SiO2 with Fe2O3 staining)
sedimentary
Petrified Wood
Silicified wood (Quartz/Chalcedony replacement of cellulose)
sedimentary
Tumbled carnelian/chalcedony
Microcrystalline quartz (SiO₂), likely iron-stained chalcedony
mineral
Red jasper (likely brecciated jasper)
Microcrystalline quartz/chalcedony, SiO₂, colored mainly by iron oxides
mineral
Moss Agate (Crescent Moon Shape)
Silicon Dioxide (SiO2) with iron/manganese inclusions
mineral
Clear Quartz
Silicon Dioxide (SiO2)
mineral
Quartz (Small fragments)
Silicon Dioxide (SiO2)
mineral