Metamorphic Or Sedimentary (With Staining)

Iron-stained quartz-rich rock, likely weathered quartzite

Quartzite (predominantly quartz, SiO₂), with iron-oxide staining

Quartzite (with Iron Staining)

Metamorphosed Quartz Sandstone (SiO2)

Orange Quartzite (or Quartz River Pebble)

Silicon Dioxide (SiO2) - Quartzite

Fossil shell or shell fragment

Likely a calcareous bivalve or gastropod fragment; precise identification requires locality and microscopy

Ferruginous Quartz

Silicon Dioxide with Iron Oxide (SiO2 + Fe2O3)

Weathered, iron-stained quartz-rich rock

Likely quartzite or massive quartz (SiO₂), possibly with limonite/goethite staining

Quartzite (Yellow/Iron-Stained)

Quartzite (SiO2 with Iron Oxide impurities)

Shale (with Iron Staining)

Argillaceous mudstone / Shale

Iron-stained quartz-rich rock, possibly weathered schist

Uncertain; likely quartz–mica schist with limonite/goethite staining

Quartzite with Hematite staining

Metamorphosed Quartz Sandstone (SiO2)

Quartzite

Quartzite (mainly SiO2)

Rounded quartz-rich pebble

Microcrystalline quartz (SiO₂), possibly chalcedony or milky quartz

Iron-stained quartz pebble (probable quartzite)

Quartz (SiO₂), possibly quartzite with hematite/goethite staining

Quartzite pebble

Quartzite

Quartzite with Hematite staining

Metamorphic Quartz (SiO2) with Ferric Oxides

Sandstone (Ferruginous)

Arenite with Iron Oxide (Limonite/Hematite) coating

Quartzite (River Cobble)

Metamorphic Quartzite (SiO2)

Quartzite

Metamorphic Sandstone (SiO2)

Quartz with Oxides

Silicon Dioxide (SiO2)

Quartzite with Iron Staining

Quartzite (SiO2)

Polished brecciated jasper

Jasper (microcrystalline quartz, SiO₂), likely brecciated and iron-oxide stained

Weathered brown stone, possibly chert or iron-stained limestone

Uncertain; likely microcrystalline quartz (SiO₂) chert or calcitic limestone (CaCO₃)

Red sandstone

Iron-oxide-cemented quartz-rich sandstone (ferruginous sandstone)

Ferruginous Sandstone

Sandstone (SiO2 with Fe2O3 cement)

Sandstone (with Iron Oxide)

Quartz Arenite / Ferruginous Sandstone (SiO2 with Fe2O3)

Sandstone with Iron Oxide Staining

Arenite with Limonite/Hematite alteration

Iron-stained quartzite or silicified breccia

Quartz-rich rock dominated by microcrystalline quartz (SiO₂), with iron oxides/hydroxides such as hematite and goethite

Quartzite (Ferruginous Quartz)

Silicon Dioxide (SiO2) with Iron Oxide inclusions

Quartzite (or Iron-Stained Quartz)

Silicon Dioxide (SiO2)

Iron-stained Quartzite

Quartzite with Limonite/Hematite staining (SiO2 with FeO(OH)·nH2O)

Yellow Quartzite (Iron-Stained Quartzite)

Quartzite (SiO2 with Fe2O3 trace impurities)

Chert (Jasper)

Microcrystalline Quartz (SiO2)

Red Jasper

Jasper (variety of Chert/Chalcedony, formula SiO2)

Likely iron-oxide–stained quartz or quartzite pebble

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

Rounded pebble, likely quartzite

Quartzite (dominantly recrystallized quartz, SiO₂); identification is uncertain from the image alone

Quartzite Pebble

Metamorphic Quartzite (SiO2)

Chert (Flint)

Microcrystalline Quartz (SiO2)

Quartzite (Iron-stained River Rock)

Metamorphic Rock consisting primarily of Quartz (SiO2)

Quartzite Cobble

Metamorphic Quartzite (SiO2)

Quartzite Pebble

Metamorphic Quartzite

Quartz (with Iron staining)

Silicon Dioxide (SiO2)

Red jasper (likely brecciated or iron-stained jasper)

Jasper, microcrystalline quartz (SiO₂), colored chiefly by iron oxides