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

Quartz-rich breccia (likely milky quartz with iron staining)

Microcrystalline to coarse quartz, SiO₂, in a brecciated silica-rich matrix; exact identification is uncertain from the photograph

Schist with Quartz Vein

Mica Schist with Crystalline Quartz (SiO2)

Quartz-rich rock, possibly milky quartz or quartzite fragment

Quartz (SiO₂), potentially quartzite if metamorphic

Banded Gneiss Pebble

Gneiss (Metamorphic Rock)

Asphalt Concrete (Bituminous Conglomerate)

Anthropogenic Bituminous Conglomerate

Polished jasper pebble

Jasper, microcrystalline quartz (SiO₂) with iron-oxide impurities

Iron-stained quartz (likely milky quartz)

Quartz, SiO₂, with limonite/goethite iron-oxide staining

White Quartz

Silicon Dioxide (SiO2)

Likely galena-bearing metamorphic sulfide ore

Galena (PbS), possibly with pyrite and/or sphalerite in a schistose host

Quartz Vein in Metamorphic Rock

Quartz-veined Schist or Gneiss

Quartz Pebble

Silicon Dioxide (SiO2)

Likely weathered quartz-bearing rock fragment

Provisional identification: quartz-rich sandstone or microcrystalline quartz (SiO₂)

Brecciated jasper/chalcedony

Silica-rich breccia composed mainly of microcrystalline quartz (SiO₂), with iron-oxide and possibly epidote or chlorite inclusions

Quartz-rich crystalline rock, likely drusy quartz on matrix

Quartz (SiO₂), possibly intergrown with calcite or feldspar matrix

Small pale stone, likely quartzite or limestone fragment

Indeterminate; possible quartzite (mostly SiO₂) or calcitic limestone (CaCO₃)

Basalt with Quartz Vein

Basalt with silicon dioxide (SiO2) inclusion

Asphalt Chunk (with aggregate)

Bituminous concrete / Anthropogenic conglomerate

Milky Quartz Vein in Host Rock

Silicon Dioxide (SiO2)

Pea Gravel / River Gravel

Unconsolidated Clastic Sedimentary Aggregate

Tumbled quartz-rich pebble, possibly quartzite

Quartz (SiO₂), likely in a quartzite or siliceous rock matrix

River Pebble (Gravel Pebble)

Stream-rounded Rock / Siliciclastic Pebble

Weathered sandstone or conglomeratic sandstone

Clastic sedimentary rock, chiefly quartz and feldspar grains cemented by iron oxides and silica/calcite

Weathered quartz-rich rock, likely quartzite

Quartzite (mostly SiO₂), possibly ferruginous quartzite or strongly silicified sandstone

Puddingstone (Gowganda Conglomerate)

Polymictic Conglomerate (SiO2 matrix with jasper and quartz inclusions)

Unidentified small rock fragment

Likely quartz-rich material; exact identification is indeterminate from the image

Conglomerate

Conglomerate (SiO2 primary clasts with lithic matrix)

Rounded quartz-rich pebble, possibly granite or granitic gneiss

Granite/granitic rock; chiefly quartz (SiO₂), feldspar, and minor mica or mafic minerals

Light-colored quartz-rich pebble

Likely quartz (silicon dioxide, SiO₂), possibly a weathered quartzite fragment

Iron-stained quartz vein rock

Milky quartz (SiO₂) with limonite/goethite iron oxides, possibly in altered host rock

Weathered quartz-rich metamorphic rock, likely gneiss

Quartz–feldspar–mica gneiss; exact identification requires thin-section or chemical testing

Pink-and-white quartz pebble

Quartz, SiO₂, likely milky quartz with iron-stained or rose-colored zones

Quartz vein in foliated metamorphic rock

Likely quartz-bearing schist or gneiss; visible crystal is quartz (SiO₂)

Polished white chalcedony or milky quartz pebble

Chalcedony, microcrystalline quartz (SiO₂), possibly with iron-oxide staining or a minor mineral inclusion

Quartz Pebble

Silicon Dioxide (SiO2)

Quartz Pebble

Silicon Dioxide (SiO2)

Quartz-rich metamorphic rock, likely milky quartz or quartzite

Quartz (SiO₂); possibly quartzite composed predominantly of recrystallized quartz

Likely milky quartz-bearing rock

Quartz, silicon dioxide (SiO₂), possibly in a quartz-rich vein or sugary quartzite

Quartz Vein in Metamorphic Rock

Quartzite or Schist host with Quartz (SiO2) intrusion

Tumbled Clear Quartz/Rock Crystal

Silicon Dioxide (SiO2)

Wishing Rock (Quartz Vein in Host Rock)

Silicon dioxide (SiO2) vein in various host rocks

Tiger’s-eye-rich breccia or jasper

Quartz-rich silicified rock, likely containing iron oxides (SiO₂ with Fe oxides/hydroxides)

Quartzite

Quartzite (primarily SiO2)