Metamorphic Or Sedimentary (With Staining)

Weathered quartz-rich river cobble, possibly quartzite

Quartzite (mostly microcrystalline SiO₂), tentatively identified

Yellow Quartzite (Iron-stained)

Quartzite (primarily SiO2 with Fe2O3 staining)

Quartz (Iron-stained)

Silicon Dioxide (SiO2)

Weathered quartz-rich rock, possibly quartzite

Quartzite (mostly SiO₂), with iron-oxide staining; exact identification is uncertain from the photograph

Ferruginous Quartzite (also known as Ironstone or Gossan)

Ferruginous Quartzite with Goethite/Hematite staining

Quartz Vein in Matrix

Silicon Dioxide (SiO2)

Polished brecciated jasper

Silica-rich microcrystalline quartz (SiO₂), likely brecciated jasper with iron-oxide staining

Weathered yellow-brown rock pebble

Undetermined; possibly iron-oxide-stained sandstone or mudstone

Weathered quartz-rich metamorphic rock

Likely quartzite or quartz-veined metamorphic rock, chiefly SiO₂ with iron-oxide staining

Milky quartz (massive quartz)

Quartz, silicon dioxide (SiO₂)

Milky Quartz with Iron Staining

Silicon Dioxide (SiO2)

Small tumbled quartz pebble

Quartz (silicon dioxide, SiO₂), possibly iron-stained milky quartz

Granite / Gneiss (Felsic Metamorphic or Igneous Rock)

Gneiss (or weathered Granite)

Quartzite pebble with iron staining

Quartzite, composed mainly of recrystallized quartz (SiO₂)

Iron-oxide-stained sulfide-bearing rock, possibly pyrite-bearing schist

Likely quartz–mica schist or massive sulfide rock with pyrite (FeS₂) and limonite/goethite (FeO(OH)·nH₂O)

Sandstone (Ferruginous)

Arenite (Fe2O3 dominant staining)

Weathered iron-stained quartzite or quartz vein rock

Quartz-rich rock, predominantly SiO₂, with limonite/goethite iron oxides

Rounded gray pebble, likely quartz-rich stone

Indeterminate; possibly quartzite or a weathered granitic pebble

Quartzite pebble

Quartzite (SiO2 with iron oxide staining)

Uncertain: likely hematite-stained quartzite or iron-rich metamorphic rock

Quartz-rich, iron-oxide-stained rock; exact identification requires testing

Limonite-stained Quartzite

Metamorphosed Quartz-rich Arenite (SiO2 with FeO(OH)·nH2O)

Quartzite with Iron Inclusions

Metamorphosed Quartz-Rich Sandstone (SiO2 with Fe2O3)

Weathered quartz-bearing rock, possibly gneiss or quartzite

Indeterminate; likely quartz-rich metamorphic rock containing quartz and feldspar

Quartzite (Iron-stained)

Quartzite (SiO2 with Fe-oxides)

Weathered quartz-rich cobble, likely sandstone or quartzite

Indeterminate; probable quartz arenite (sandstone) or quartzite, dominated by SiO₂

Quartzite with Iron Staining

Silicon Dioxide (SiO2) with Fe2O3 impurities

Quartzite River Rock

Metamorphic Quartzite (SiO2)

Quartzite Pebble (River Rock)

Metamorphic Quartzite (SiO2)

Quartzite Cobble

Metamorphosed Quartz Sandstone (SiO2)

Dark, coarse-grained rock fragment (possibly amphibolite or gabbro)

Undetermined; amphibolite commonly contains hornblende and plagioclase, while gabbro contains plagioclase and pyroxene

Iron-stained quartz vein in a fine-grained host rock

Quartz (SiO₂) filling a fracture in an unidentified silicate rock; orange coloration likely from iron oxides/hydroxides

Ferruginous Quartz (Iron-stained Quartzite)

Silicon Dioxide (SiO2) with Hematite/Limonite impurities

Wishing Stone (Quartz-veined Metamorphic/Sedimentary Rock)

Quartz Vein in Greywacke/Slate (SiO2 in host rock)

Iron-stained quartzite (probable jasper-bearing quartzite)

Quartzite, predominantly SiO₂, colored by iron oxides such as hematite/goethite

Quartz-bearing altered rock

Likely quartz vein in weathered schist or gneiss; quartz is SiO₂

Quartzite

Quartzite (SiO2)

Iron-rich sandstone (ferruginous sandstone)

Ferruginous sandstone, composed mainly of quartz (SiO₂) cemented by iron oxides such as hematite or goethite

Sandstone (Ferruginous / River-worn Cobble)

Sandstone (SiO2 with iron oxide impurities)

Red Sandstone

Arenite (Fe2O3 rich)

Ferruginous Quartz

Silicon Dioxide (SiO2) with Iron Oxide inclusions

Quartzite pebble

Metamorphic Quartzite (SiO2)

Weathered quartz-bearing rock, possibly sandstone or quartzite

Provisional: quartzite (mostly SiO₂); could alternatively be iron-stained quartz sandstone