Metamorphic Or Sedimentary (With Staining)

Sandstone (Banded)

Clastic Sedimentary Rock (primarily SiO2 with Iron Oxide staining)

Tumbled brown mineral pebble, possibly jasper or weathered quartzite

Indeterminate from the blurred image; likely microcrystalline quartz (SiO₂) if jasper, or quartzite dominated by quartz

Quartzite (Iron-stained)

Quartzite (SiO2 with iron oxides)

Polished pyrite-bearing breccia (likely hematite/jasper with pyrite)

Iron-oxide-rich jasper/hematite breccia with disseminated pyrite (FeS₂); exact identification requires testing

Limonite-stained Quartz / Quartzite

Silicon Dioxide (SiO2) with iron hydroxides (FeO(OH)·nH2O)

Ferruginous Sandstone (with Pyrite/Gold associations)

Ferruginous Arenite (SiO2 + Fe2O3)

Quartzite River Rock

Quartzite (SiO2)

Weathered granite or granitic gneiss

Granite, chiefly quartz, feldspar, and mica; exact identification is uncertain from the photograph

Reddish sandstone or iron-stained quartzite pebble

Likely ferruginous sandstone; possibly quartzite, composed mainly of quartz (SiO₂) with iron oxides

Orange Quartz (Citrine Quartz)

Silicon Dioxide (SiO2)

Smooth river pebble, likely quartz-rich sandstone or quartzite

Probable quartz arenite (sandstone) or quartzite; mainly SiO₂ with minor iron-bearing minerals

Red-brown mica schist (tentative)

Muscovite- or biotite-bearing schist; composition likely quartz + feldspar + mica, with iron-oxide staining

Mixed beach pebbles; likely quartzite, granite, and iron-stained metamorphic rock

Predominantly quartzite (SiO₂), granite (quartz–feldspar–mica), and weathered iron-rich rock

Ferruginous Sandstone (Ironstone)

Clastic Sedimentary Rock (composed of SiO2 with Fe2O3/FeO(OH) cement)

Quartz Pebble (Iron-Stained Quartz)

Silicon Dioxide (SiO2) with Hematite/Limonite inclusion

Weathered iron-rich sandstone or ferruginous siltstone

Clastic sedimentary rock, likely quartz-rich sandstone cemented by iron oxides (Fe₂O₃/Fe₃O₄)

Weathered iron-rich rock, possibly banded iron formation

Hematite–goethite-rich ironstone; possible BIF (Fe₂O₃/FeO(OH) with quartz)

Weathered iron-rich metamorphic rock, likely banded ironstone or quartzite

Ferruginous quartzite/itabirite; mainly quartz (SiO₂) with iron oxides such as hematite and goethite

Ferruginous Quartz

Quartz (Silicon Dioxide) - SiO2 with Iron Oxide inclusions

Petrified Wood

Silicified Wood (SiO2)

Bauxite (Concretionary)

Bauxite (Al(OH)3, AlO(OH))

Sandstone (with Liesegang rings or Oxidation)

Arenite (primarily Quartz SiO2 with Iron Oxide Fe2O3 staining)

Orange Calcite / Quartzite with Iron Staining

Silicon Dioxide (SiO2) or Calcium Carbonate (CaCO3) with Iron Oxide impurities

Yellow quartz pebble, likely iron-stained milky quartz

Quartz (SiO₂), colored by iron-oxide inclusions or staining

Weathered quartz-bearing rock, possibly iron-stained quartzite or granitic pegmatite

Indeterminate; likely quartz-rich silicate rock with iron-oxide staining (SiO₂-dominant)

Quartzite

Silicon Dioxide (SiO2)

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

Quartzite with Iron Oxide

Quartzite

Weathered quartz-rich rock, possibly iron-stained quartzite

Quartzite (predominantly SiO₂), tentatively; may instead be quartz vein material or chert

Quartzite with Hematite

Metamorphic Quartzite (SiO2 with Fe2O3 inclusions)

Chert (Flint / Jasper)

Silicon Dioxide (SiO2)

Quartz Pebble

Silicon Dioxide (SiO2)

Gold Ore in Quartz/Schist

Auriferous Quartz and Sulfide-bearing Schist

Jasper with Epidote (Unakite-related)

Epidotized Quartzite (composed of Quartz, Epidote, and Feldspar)

Iron-stained quartz-rich rock

Likely quartzite with iron-oxide staining; identification is provisional from the image

Quartz-rich iron-stained metamorphic rock (likely quartzite)

Quartzite; predominantly quartz (SiO₂) with iron oxides/hydroxides, possibly feldspar and mica

Polished jasper–quartzite river pebble

Silicified metasedimentary rock, chiefly microcrystalline quartz (SiO₂) with iron-oxide staining

Weathered quartz-rich rock, likely quartzite

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

Jasper

Silicon Dioxide (SiO2) with impurities

Quartzite with Iron Staining

Metamorphosed Quartz Sandstone (SiO2 with Fe2O3 trace)

Small tumbled pebble (likely quartz or feldspar)

Indeterminate; probable quartz (SiO₂) or feldspar

Quartzite River Pebble

Metamorphic Quartzite (SiO2)