Sedimentary Rock (Possibly Conglomerate Or Breccia With A Quartz Vein)

Milky quartz

Quartz (silicon dioxide, SiO₂)

Limestone with Fossil Imprints

Biogenic Limestone (Calcium Carbonate, CaCO3)

Granite (with Quartz Vein and Biotite)

Granite (Plutonic Igneous Rock)

Quartz-veined Siltstone

Siltstone with Quartz (SiO2) veins

Banded Gneiss (with possible weathered sulfide or iron staining)

Gneiss, potentially with iron oxide/hydroxide staining (e.g., limonite) or weathered sulfides

Jasper Conglomerate (Puddingstone)

Jasper Conglomerate (SiO2 matrix with quartz/jasper clasts)

Chert (flint-like chalcedony)

Microcrystalline quartz, SiO₂

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

Weathered granite or granitic gneiss

Granite: quartz, feldspar, and mica; possibly weakly foliated gneiss

Quartz River Pebble (Iron-Stained)

Silicon Dioxide (SiO2) with Limonite/Hematite inclusions

Quartz (Iron-Stained)

Silicon Dioxide (SiO2)

Banded River Pebble (Gneiss or Quartz-Veined Basalt)

Polished River Siltstone or Quartzite Gneiss

Jasper

Microcrystalline Quartz (SiO2)

Granite (likely weathered quartz-bearing granite)

Granite; primarily quartz, feldspar, and mica/amphibole

Quartz (Iron-stained)

Silicon Dioxide (SiO2)

Ferruginous Quartz

Silicon Dioxide with Iron Oxide Inclusions (SiO2)

Green Quartz (Prasiolite/Adventurine)

Silicon Dioxide with inclusions (SiO2)

Red Jasper

Silicon Dioxide (SiO2) with Hematite inclusions

Iron-rich brown stone, possibly weathered chert or ironstone

Undetermined; likely iron-oxide-bearing silica-rich rock (chert/ironstone)

Vesicular basalt (likely weathered lava rock)

Basalt; fine-grained mafic volcanic rock composed chiefly of plagioclase, pyroxene, and commonly olivine

Quartz

Silicon Dioxide (SiO2)

Milky Quartz

Silicon Dioxide (SiO2)

Rounded gray metamorphic cobble, likely quartzite or gneiss

Quartz-rich metamorphic rock; possibly quartzite (mostly SiO₂) or banded gneiss

Emerald (or possibly Green Glass / Slag)

Beryl (Be3Al2(SiO3)6)

Weathered chert or silicified limestone nodule

Microcrystalline quartz (SiO₂), possibly replacing limestone; exact identification requires testing

Granite

Felsic intrusive igneous rock (Granite)

Quartzite

Quartzite (SiO2)

Quartzite (Milky Quartz pebble)

Silicon Dioxide (SiO2)

Clear quartz sphere or polished quartz cabochon (tentative)

Quartz, silicon dioxide (SiO₂); appearance may also be consistent with ordinary glass, which cannot be ruled out from the image alone

Quartz (possibly milky quartz or quartz with inclusions)

SiO2 (Silicon Dioxide)

Banded Slate or Siltstone with Quartz/Calcite Veins

Protolith-derived Siltstone or Slate (varies based on degree of metamorphism)

Quartz Pebble

Silicon Dioxide (SiO2)

Quartzite (or Quartz Rich Conglomerate)

Quartzite (SiO2 silicon dioxide)

Jasper and Quartz conglomerate

Silicon Dioxide (SiO2) with iron oxide impurities

Quartz Vein in Host Rock (Gabbro or Basalt)

Silicon Dioxide (SiO2) with Mafic Silicates

Metallic sulfide ore, likely pyrite-bearing rock

Pyrite (FeS₂), possibly with marcasite or other sulfides

Mica-rich metamorphic rock, likely schist

Biotite–muscovite schist, possibly garnet-bearing

Quartz Crystal

Quartz (SiO₂)

Tumbled citrine or iron-stained quartz

Quartz (SiO₂), likely iron-oxide-stained or natural citrine

Basalt with Quartz Veining

Amygdaloidal Basalt (predominately SiO2 and (Na,Ca)(Si,Al)4O8)

Gneiss (with Quartz Vein / Pegmatite Banding)

Metamorphic Gneiss

Likely quartz-rich mineral fragment

Quartz (SiO₂), possibly iron-stained or included quartz