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

Iron-stained breccia or weathered ironstone

Ferruginous breccia; predominantly quartz/chert fragments cemented by iron oxides (goethite and hematite)

Quartz-rich rock, possibly quartzite

Quartzite (provisional identification; predominantly quartz, SiO₂)

Weathered quartz-bearing rock, possibly mica schist or pegmatite

Quartz (SiO₂) with probable mica and feldspar; exact rock identification is uncertain from the photograph

Conglomerate

Conglomerate

Conglomerate

Conglomerate (lithified rudite)

Conglomerate

Conglomeratic Sandstone / Polymictic Conglomerate

Quartz-rich rock fragment, possibly milky quartz with iron staining

Quartz (SiO₂), potentially vein quartz or quartz-bearing pegmatite

Likely weathered chert or siliceous limestone fragment

Microcrystalline quartz (SiO₂), possibly with calcite (CaCO₃)

Quartz-bearing rock, possibly pegmatite

Likely quartz and feldspar with dark mica or other accessory minerals; exact rock type is uncertain from the image

Iron-stained quartz-bearing rock, possibly quartzite or hydrothermal quartz breccia

Quartz (SiO₂) with iron-oxide/hydroxide coatings, likely limonite/goethite; exact host rock uncertain

Quartz Vein in Sandstone

Sandstone with Hydrothermal Quartz (SiO2)

Quartz pebble

Silicon dioxide (SiO2)

Quartz-rich rock fragment, likely milky quartz with iron staining

Quartz (SiO₂), possibly in a quartz-rich vein rock

Quartz Pebble

Silicon Dioxide (SiO2)

Likely quartz-bearing rock or mineral fragment

Indeterminate; possibly quartz (SiO₂) with iron-oxide staining and darker matrix

Quartz-rich hydrothermal vein rock

Milky quartz with iron-oxide staining, possibly quartzite or silicified host rock (SiO₂)

Likely garnet-bearing mica schist

Mica schist, possibly containing garnet (garnet–mica schist)

Weathered limestone or calcitic cave deposit

Calcite (CaCO₃), likely porous limestone/travertine

Milky quartz

Quartz (silicon dioxide, SiO₂)

Rounded gray river pebble, likely basalt or fine-grained volcanic rock

Probable basalt (fine-grained plagioclase–pyroxene rock); exact identification requires testing

Milky quartz-rich rock, possibly quartzite

Quartz (SiO₂), likely in a quartzite or quartz-vein matrix

Polished brecciated jasper

Jasper, an opaque microcrystalline variety of quartz (SiO₂), with iron-oxide and possibly manganese-rich inclusions

Weathered quartz-rich rock, likely quartzite

Quartzite (mostly SiO₂), possibly quartz-rich sandstone or milky quartz vein material

Quartz-rich river pebble, possibly weathered quartzite

Quartzite; predominantly crystalline SiO₂, though exact identification is uncertain from the photograph

Quartz-rich hydrothermal vein rock, possibly quartzite

Mostly SiO₂ (quartz), with probable iron oxides and minor sulfides

Conglomerate

Polymictic conglomerate; rounded clasts cemented in a fine-grained matrix

Quartz vein in a light-colored host rock

Quartz (SiO₂), possibly in quartz-rich vein rock

Likely weathered iron-rich rock

Probable basalt or limonite/goethite-stained mafic rock; exact identification requires testing

Rounded quartz-rich pebble, possibly milky quartz or quartzite

Quartz (SiO₂), potentially quartzite if recrystallized rock

Brecciated Limestone or Marble Pebble

Breccia / Calcite (CaCO3)

Weathered quartz-rich rock, possibly quartzite or quartz vein material

Quartz-dominant aggregate; chiefly SiO₂, with likely iron-oxide staining and minor feldspar or mica

Rough amber-colored quartz or calcite fragment

Likely quartz (SiO₂) or calcite (CaCO₃); exact identification requires testing

Pale blue-gray quartz-rich pebble (tentative)

Quartz, SiO₂, possibly chalcedony or a weathered metamorphic fragment

Iron-stained quartz-rich rock (probable quartzite or silicified breccia)

Quartz-dominant aggregate, chiefly SiO₂, with iron oxides/hydroxides

Unidentified weathered rock, possibly quartz-bearing granite or rhyolite

Indeterminate; likely quartz–feldspar-rich silicate rock

Iron-stained quartz-rich rock, possibly gold-bearing quartz

Quartz (SiO₂) with iron-oxide staining; possible limonite/goethite matrix

Quartz Pebble

Silicon Dioxide (SiO2)

Milky quartz fragment

Quartz, silicon dioxide (SiO₂)

Chalcedony (possibly agate or common quartz)

Microcrystalline quartz, SiO₂

Breciated Chert

Brecciated Chert (Microcrystalline Quartz, SiO2)

Quartz-rich rock, possibly milky quartz in a weathered host

Quartz (SiO₂); the specimen may be a quartz vein fragment, but the image is insufficient for a precise identification

Weathered quartz-rich stone, possibly chalcedony or calcite

Likely microcrystalline quartz (SiO₂) or calcite (CaCO₃); exact identification requires testing