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

Small pale mineral fragment

Unidentified; possibly quartz, calcite, or feldspar

Quartz Geode (partially formed/chalcedony with iron staining)

Quartz (SiO2) with Chalcedony (cryptocrystalline quartz) and likely Iron Oxides/Hydroxides

Bandit Heart Pebble (Quartz-Veined Sedimentary Rock)

Quartz-veined siltstone or sandstone

Orange calcite fragment

Calcite (CaCO₃), likely iron-stained or orange-colored calcite

Quartz vein in Schist

Crystalline Silicon Dioxide (SiO2) in Metamorphic Host

Milky Quartz / Rose Quartz fragment

Silicon Dioxide (SiO2)

Reddish-brown rounded pebble, likely iron-stained sandstone or chert

Probable quartz-rich sandstone (SiO₂), possibly ferruginous chert; exact identification requires testing

Weathered quartz-rich pebble

Milky quartz, chiefly silicon dioxide (SiO₂), possibly with iron-oxide staining and minor feldspar

Botryoidal chalcedony (possibly agate/geode material)

Microcrystalline quartz, SiO₂; commonly chalcedony with quartz-lined cavities and iron-oxide staining

Quartz pebble

Silicon dioxide (SiO2)

Puddingstone (Gowganda)

Jasper-clast Polymictic Conglomerate (Gowganda Formation)

Banded Chert (with Quartz Vein)

Microcrystalline Silica (SiO2)

Quartz Veined Basalt

Mafic Volcanic Rock with Microcrystalline Quartz (SiO2)

Quartz-rich pegmatitic rock, possibly rose quartz with mica

Granitic pegmatite; predominantly quartz (SiO₂), with feldspar and mica

Milky Quartz

Silicon Dioxide (SiO₂)

Fossiliferous Limestone

Limestone with embedded fossil cross-section

Tumbled jasper (likely ocean or orbicular jasper)

Microcrystalline quartz (chalcedony), SiO₂, with iron oxides and dark accessory minerals

Jasper

Microcrystalline Quartz (SiO2)

Quartz (Iron-stained)

Silicon Dioxide (SiO2)

Chert (Jasper)

Silicon Dioxide (SiO2)

Quartz (White/Milky)

Silicon Dioxide (SiO2)

Quartz

Silicon Dioxide (SiO2)

Black Beach Pebble (Basalt / Slate Pebble)

Rounded Fine-Grained Clastic / Igneous Rock Pebble

Quartz Vein in Host Rock (Pebble)

Quartz (SiO2) with sandstone or siltstone matrix

Milky Quartz

Silicon Dioxide (SiO2)

Pale green calcite

Calcite (CaCO₃), likely crystalline limestone or calcite-rich material

Quartz pebble

Silicon dioxide (SiO2)

Milky quartz with iron-oxide staining and dark matrix

Quartz (SiO₂), likely with hematite/goethite and minor feldspar or mica

Quartzite River Rock (with Quartz Vein)

Quartzite (SiO2)

Chert (Flint)

Microcrystalline Quartz (SiO2)

Chalcedony (Botryoidal Agate vein)

Chalcedony (Microcrystalline Quartz) - SiO2

Milky Quartz

Silicon Dioxide (SiO2)

Common River Pebbles and Stones

Mixed natural stream gravel / siliciclastic pebbles

Mica-bearing quartz rock (likely pegmatite)

Quartz–feldspar–mica pegmatite; dark mica is probably biotite, possibly muscovite or chlorite

Rounded gray-brown river cobble

Indeterminate lithology; possibly weathered quartzite, chert, or fine-grained sandstone

Calcite (or Alabaster, if truly carved)

Calcium Carbonate (CaCO3)

Pegmatitic mica-quartz-feldspar specimen

Granitic pegmatite, chiefly quartz (SiO₂), feldspar, and muscovite/biotite mica

Puddingstone (specifically Michigan/Gowganda Puddingstone)

Quartzite Conglomerate (Gowganda Formation)

Milky Quartz with Iron Staining

Quartz (Silicon Dioxide, SiO2)

Milky Quartz Vein in Host Rock

Silicon Dioxide (SiO2)

Carved quartz skull, likely smoky quartz or gray chalcedony

Silicon dioxide (SiO₂), quartz or microcrystalline quartz

Quartz Veined Rock (Likely Graywacke or Quartzite)

Silicon Dioxide (SiO2) veins in Metasedimentary matrix