Metamorphic Or Sedimentary (With Staining)

Weathered quartz-rich rock, likely feldspathic quartzite or quartz vein fragment

Quartzite dominated by quartz (SiO₂), with probable feldspar and iron-oxide staining

Iron-stained quartzite or weathered sandstone

Quartzite, predominantly quartz (SiO₂), possibly derived from sandstone; exact identification requires testing

Iron-stained quartz-rich rock, possibly quartzite or hydrothermal quartz

Quartz (SiO₂), likely with iron oxides; exact host rock uncertain from the photograph

Quartzite with Iron Inclusions

Quartzite (SiO2 with Fe2O3)

Ferruginous Quartz (Agatized/Iron-stained Quartzite)

Silicon Dioxide (SiO2) with Iron Oxide (Fe2O3) inclusions

Sandstone (with Iron Staining)

Clastic sedimentary rock (primarily SiO2 with Fe2O3 staining)

Sandstone with Iron Staining

Clastic sedimentary rock (primarily SiO2 with Fe2O3 staining)

Sandstone (with Iron Staining)

Clastic sedimentary rock (primarily SiO2 with Fe2O3 staining)

Sandstone (with Iron Staining)

Clastic sedimentary rock (primarily SiO2 with Fe2O3 staining)

Quartzite (Iron-stained)

Metamorphic Quartzite (SiO2)

Rounded iron-rich pebble

Likely ferruginous sandstone or ironstone; exact identification is uncertain from the photograph

Milky Quartz with Iron Oxide Staining

Quartz (Silicon Dioxide, SiO2)

Ferruginous Quartz (Iron-stained Quartz)

Quartz with Iron Oxide inclusions (SiO2 with Fe2O3)

Iron-stained milky quartz

Quartz (SiO₂), with iron-oxide staining

Quartzite Cobble

Quartzite (SiO2)

Quartzite (River Pebble)

Metamorphosed Quartz Sandstone (SiO2)

Yellow Quartzite (River Pebble)

Quartzite (SiO2 with iron oxide impurities)

Quartzite with Hematite staining

Quartzite (SiO2)

Quartzite

Metamorphosed Sandstone (SiO2)

Quartzite with Hematite

Silica (SiO2) with Ferric Oxide (Fe2O3) inclusions

Quartzite Pebble

Metamorphic Quartzite (primarily SiO2)

Ironstone Concretion

Siderite / Hematite-bearing Sedimentary Rock

Quartz Vein Rock

Silicon Dioxide (SiO2)

Limonite (Iron Ore)

Limonite (Hydrous iron(III) oxide-hydroxide mixture, primarily FeO(OH)·nH2O)

Quartz-rich metamorphic rock, likely quartzite or quartz vein in schist

Quartz (SiO₂) with probable mica, feldspar, and iron-oxide staining

Quartzite (River Cobble)

SiO2 (Quartz-rich Metamorphic Rock)

Banded gneiss

Gneiss, commonly quartz–feldspar–mica gneiss

Weathered quartz-rich rock, likely quartzite

Quartzite (predominantly quartz, SiO₂), possibly iron-stained quartz vein material

Possible weathered sandstone or iron-rich sedimentary rock

Indeterminate siliciclastic rock; likely quartz-rich sandstone with iron-oxide cement

Quartz Vein Rock

Silicon Dioxide (SiO2)

Milky Quartz

Silicon Dioxide (SiO2)

Tumbled quartz-rich pebble, possibly chert or quartzite

Quartz (SiO₂), likely in a fine-grained quartzite or silicified rock matrix

Sandstone (Iron-stained)

Clastic sedimentary rock (SiO2 with Fe2O3 staining)

Weathered quartz-rich rock, possibly granite or quartzite

Indeterminate; likely quartz–feldspar aggregate, such as granite, or recrystallized quartzite

Quartzite Pebble

Metamorphic Quartzite (primarily SiO2)

Sandstone with Iron Staining

Arenite (SiO2 with Fe-oxide coatings)

Quartzite Pebble

Metamorphic Quartzite (SiO2)

Quartz (Microcrystalline/Chert)

Silicon Dioxide (SiO2)

Hornblende-biotite schist (probable)

Amphibole–biotite schist; chiefly hornblende, biotite, plagioclase, and quartz

Quartz (River Cobble)

Silicon Dioxide (SiO2)

Fossil shark tooth

Likely fossilized shark tooth, possibly Carcharhinus or a related requiem shark

Quartz-rich pegmatitic rock, possibly quartzite or milky quartz with iron staining

Predominantly quartz (SiO₂), with probable feldspar and iron-oxide staining; exact classification is uncertain from the photograph