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

Tumbled jasper (likely brecciated or red jasper)

Jasper, microcrystalline quartz/chalcedony (SiO₂), colored by iron oxides

Small white mineral fragment

Likely quartz (SiO₂), possibly calcite (CaCO₃)

Likely weathered quartz-rich rock fragment

Uncertain; possibly quartz-bearing granitic or metamorphic material (SiO₂-dominant)

Weathered basalt or volcanic breccia

Fine-grained mafic volcanic rock, likely basalt (plagioclase–pyroxene ± olivine), possibly brecciated

Conglomerate (Pebble Conglomerate)

Conglomerate

Quartz-bearing iron-rich rock, possibly quartzite or hydrothermal breccia

Quartz (SiO₂) with iron oxides/hydroxides, likely limonite/goethite; exact host rock is uncertain from the photograph

Quartz-rich breccia or iron-stained quartzite

Silica-rich rock dominated by quartz (SiO₂), with minor iron oxides and possible feldspar

Quartz-rich pebble

Mostly quartz (SiO₂), possibly a quartzite or vein-quartz fragment

Breciated Limestone with Calcite Veins

Sedimentary Breccia (CaCO3)

Polished brecciated jasper

Brecciated jasper; microcrystalline quartz (SiO₂) with iron-oxide pigments and angular rock fragments

Weathered quartz-rich rock, possibly quartzite or vein quartz

Quartzite (mostly SiO₂), but exact identification is uncertain from the image

Weathered quartz-rich pebble, possibly quartzite or chert

Quartz (SiO₂), possibly quartzite; exact identification is uncertain from the image

Conglomerate

Conglomerate Rock

Chert Breccia

Brecciated Chert (SiO2)

Quartz-veined Sandstone

Sedimentary rock with quartz vein (SiO2)

Quartz-bearing weathered rock, possibly quartzite or quartz vein fragment

Quartz (SiO₂), with iron-oxide staining and likely feldspathic impurities

Polished agate or jasper cabochon

Microcrystalline quartz (chalcedony), SiO₂, possibly brecciated or plume agate

Quartz-rich rock, possibly milky quartz or quartzite

Quartz (SiO₂); if quartzite, recrystallized quartz sandstone

Quartz-rich breccia or silicified breccia

Cryptocrystalline quartz/chalcedony (SiO₂) with iron oxides and dark lithic fragments; exact classification is uncertain from the photograph

Jasper-rich breccia (likely iron-stained jasper)

Silicified breccia composed mainly of microcrystalline quartz (SiO₂), with hematite/goethite and possibly iron-rich clay minerals

Iron-stained quartz-rich breccia (probable)

Hydrothermal quartz–iron oxide breccia; mainly SiO₂ quartz with iron oxides/hydroxides (hematite/goethite)

Small brown quartz-rich pebble, possibly chert or jasper

Microcrystalline quartz (SiO₂), tentative

Quartz-rich rock fragment

Microcrystalline quartz (SiO₂), possibly chalcedony or quartz-bearing breccia

Quartz-Veined Sandstone

Quartz-veined Arenite

Weathered iron-rich sandstone or conglomeratic sedimentary cobble

Ferruginous sandstone, possibly polymictic conglomerate

Weathered quartz-rich rock fragment

Likely quartz-bearing vein rock, possibly quartzite or silicified breccia; exact identification requires testing

Conglomerate

Conglomerate (Sedimentary Rock)

Polished banded pebble, likely quartz-veined chert or jasper

Microcrystalline quartz (SiO₂), possibly chert/jasper with a quartz or chalcedony vein

Conglomerate with rounded carbonate clasts

Polymictic carbonate conglomerate; clasts likely limestone or coral-derived calcite (CaCO₃)

Weathered volcanic breccia

Pyroclastic volcanic breccia, likely andesitic or basaltic

Conglomerate

Conglomerate

Jasper and Quartz Breccia

Silicified Breccia (Quartz / Chalcedony / Hematite)

Tumbled brown translucent stone, likely quartz/jasper

Microcrystalline quartz (SiO₂), possibly iron-stained chalcedony or jasper

Weathered sandstone or arkosic conglomeratic sandstone

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

Weathered quartz-rich rock, possibly quartzite or chert

Quartz (SiO₂), likely in a quartzite matrix; exact identification is uncertain from the image

Conglomerate

Clastic sedimentary rock (Polymict conglomerate with quartz/calcite matrix)

Quartz-rich breccia or quartzite with iron-oxide veining

Microcrystalline to granular SiO₂ (quartz), with hematite/goethite and minor feldspar or mica

Conglomerate with Quartzite Pebbles

Clastic sedimentary rock (Conglomerate)

Puddingstone (specifically Michigan/Gowganda Puddingstone)

Conglomerate (Jasper Conglomerate)

Brecciated jasper (likely poppy jasper or mookaite-type jasper)

Microcrystalline quartz (chalcedony), SiO₂, with iron-oxide pigments and breccia fragments

Quartz-rich breccia or iron-stained quartz

Microcrystalline to crystalline quartz (SiO₂), with probable iron-oxide staining and minor host-rock fragments

Conglomerate

Conglomerate rock