Metamorphic Or Sedimentary (With Staining)

Green Sandstone Pebble (River/Beach Pebble)

Glauconitic Sandstone

Iron-stained quartzite or quartz-rich rock

Quartz (SiO₂), likely in a quartzite matrix with iron-oxide/hydroxide coatings (hematite/goethite)

Milky Quartz

Silicon Dioxide (SiO2)

Quartz Vein in Host Rock

Silicon Dioxide (SiO2)

Quartz–mica metamorphic rock, likely schist

Quartz–muscovite/biotite schist; predominantly SiO₂ quartz with phyllosilicate micas

Quartzite

Quartzite (SiO2)

Banded sandstone pebble

Lithic or quartz-rich sandstone; exact composition requires testing

Banded gneiss

Gneiss, likely quartz–feldspar–mica gneiss

Slate with Iron Staining

Low-grade Metamorphic Mudstone (Slate)

Tumbled quartz pebble

Quartz, silicon dioxide (SiO₂)

Iron-stained quartz-rich rock, possibly ironstone or quartz-vein material

Quartz (SiO₂) with iron oxides/hydroxides; exact host rock cannot be determined from the image

Green Adventurine

Quartz (SiO2) with Fuchsite inclusions

Quartzite Beach Pebble

Quartzite (primarily SiO2)

Small tumbled brown mineral specimen

Likely quartz variety or iron-stained feldspar; exact identification is uncertain from the image

Tumbled yellow quartz (likely citrine or iron-stained quartz)

Quartz, silicon dioxide (SiO₂), yellow coloration from iron impurities

Dendritic Siltstone

Siltstone with Manganese Dendrites (MnO2)

Weathered Sandstone Cobble

Arenite / Quartz Sandstone

Quartzite with Iron Staining

Metamorphic Quartzite (SiO2)

Iron-stained milky quartz vein

Quartz (SiO₂), with iron-oxide/hydroxide staining and minor dark inclusions

Milky Quartz with Iron Oxide Weathering

Silicon Dioxide (SiO2) with Goethite/Limonite coatings

Sandstone (Quartzose Sandstone)

Clastic Sedimentary Rock - Arenite

Weathered volcanic rock, likely basalt or andesite

Fine-grained mafic to intermediate volcanic rock; primarily plagioclase feldspar, pyroxene, and possibly olivine or iron oxides

Ferruginous Quartz

Silicon Dioxide (SiO2) with Iron Oxide inclusions

Quartzite with Iron Inclusions

Quartzite (SiO2 with Fe2O3 impurities)

Yellow Quartzite (Citrine-colored Quartz)

Silicon Dioxide (SiO2) with iron oxide inclusions

Yellow Quartzite

Quartzite (primarily SiO2)

Pink Quartzite

Metamorphosed Quartz Sandstone (SiO2 with iron oxide inclusions)

Weathered sulfide-bearing metamorphic rock (probable pyrite schist)

Quartz–mica schist with iron sulfides, chiefly pyrite (FeS₂), possibly chalcopyrite (CuFeS₂)

Tumbled brown stone, likely brown jasper or iron-rich chert

Microcrystalline quartz (SiO₂), possibly hematite/goethite-bearing

Ferruginous Quartz

Silicon Dioxide (SiO2) with Hematite/Limonite inclusions

Yellow Quartz

Silicon Dioxide (SiO2)

Quartz-rich rock, possibly iron-stained quartz or quartzite

Quartz (SiO₂), likely with iron-oxide inclusions; exact identification requires testing

Quartzite with Hematite staining

Metamorphic Quartzite (SiO2)

Yellow Quartzite (River Pebble)

Crystalline Quartz (SiO2)

Iron-stained quartzite (ferruginous quartzite)

Quartzite, chiefly SiO₂, colored by iron oxides/hydroxides such as hematite and goethite

Green Quartzite

Quartzite (primarily SiO2 with inclusions)

Iron-stained quartzite or quartz-rich metamorphic rock

Quartzite, predominantly crystalline SiO₂, with iron-oxide minerals (hematite/goethite)

Sandstone with Dendritic Inclusions

Quartzose Sandstone

Brecciated jasper with quartz veins

Silica-rich breccia; predominantly microcrystalline quartz/chalcedony (SiO₂) with iron-oxide staining

Weathered quartz-rich pebble

Likely quartz-bearing granite or granitic gneiss; exact identification requires testing

Milky Quartz with inclusions

Silicon Dioxide (SiO2)

Quartzite River Rock

Quartzite (SiO2)