All rocks & minerals

Rose quartz-bearing pegmatite

Quartz (SiO₂) with pink feldspar, likely potassium feldspar; exact identification is limited by the image

Milky quartz with iron staining

Quartz (SiO₂), likely massive milky quartz with iron-oxide inclusions or surface staining

Biotite-rich granite (mica granite)

Coarse-grained granitoid, chiefly quartz, feldspar, and biotite mica

Diamond ring

Diamond (crystalline carbon, C) set in a metal ring; the small stones appear diamond-like but cannot be confirmed from the image.

Banded amphibolite

Amphibolite, chiefly hornblende and plagioclase, with light-colored quartz- or feldspar-rich bands

Diamond ring

Diamond (crystalline carbon, C) set in a metal band; the small stones may be diamonds or simulants.

Petrified wood

Silicified fossil wood; commonly quartz (SiO₂) replacing wood tissue

Red jasper

Jasper, an opaque microcrystalline variety of quartz (SiO₂), colored mainly by iron oxides

Malachite-bearing matrix specimen

Malachite, Cu₂CO₃(OH)₂, with likely quartz and iron-stained host rock

K-feldspar-rich granite (possibly pink pegmatitic granite)

Granite, chiefly quartz (SiO₂), potassium feldspar (KAlSi₃O₈), and plagioclase, with possible mica

Banded gneiss

Foliated quartz–feldspar gneiss, likely granitic gneiss

Iron-stained milky quartz

Quartz (SiO₂), with reddish-brown iron-oxide staining, likely hematite and/or goethite

Greenstone (likely chlorite-rich metamorphic rock)

Chlorite schist/greenstone; possible actinolite- or epidote-bearing assemblage

Rose quartz-bearing rock

Quartz (SiO₂), likely massive rose quartz with iron-oxide staining

Serpentinite (probable)

Serpentinite, a rock composed chiefly of serpentine-group minerals such as antigorite, lizardite, or chrysotile

Likely foliated metamorphic rock (schist or phyllite)

Undetermined from the image; possibly mica-rich schist or phyllite

Vesicular basalt (scoria-like volcanic rock)

Basalt, composed mainly of plagioclase feldspar and pyroxene, commonly with olivine

Likely mica-rich schist

Mica schist, probably muscovite- or biotite-bearing; exact minerals cannot be confirmed from the photo

Likely biotite-rich schist

Mica schist, probably biotite–quartz–feldspar schist

Gneiss

Quartz–feldspar–mica gneiss

Granite

Granite, a coarse-grained felsic intrusive igneous rock composed mainly of quartz, feldspar, and mica

Mica-rich schist

Muscovite–biotite schist, with quartz and feldspar

Blue obsidian-like volcanic glass

Volcanic glass, chiefly silica-rich amorphous material (composition uncertain)

Jasper / Chert Pebble

Microcrystalline Quartz (SiO2)

Ironstone Concretion / Limonite Nodule

Limonite / Goethite-cemented Concretion (FeO(OH)·nH2O)

Heart-shaped ironstone pebble

Ironstone concretion, likely goethite/hematite cemented sandstone or siltstone

Likely pyrite-bearing rock

Pyrite (FeS₂) in a dark host rock; exact identification is uncertain from the image

Quartz-rich rock, possibly milky quartz

Quartz (SiO₂); the photo may show a quartz-rich rock, but its texture is not clear enough to determine a specific rock name.

Likely quartz-rich sandstone

Quartz arenite (tentative; exact identification is not possible from the image alone)

Weathered iron-rich rock, possibly ironstone

Ironstone; likely limonite/goethite-rich material, identification provisional from the photo

Likely jasper pebble

Jasper, an opaque microcrystalline variety of quartz (SiO₂), colored by iron oxides

Likely weathered copper-bearing rock

Indeterminate from the photo; possibly malachite-bearing rock (Cu₂CO₃(OH)₂)

Banded sandstone

Iron-oxide-stained quartz sandstone

Likely ironstone or iron-rich rock fragment

Iron-oxide-rich sedimentary material, chiefly hematite (α-Fe₂O₃) and/or goethite (FeO(OH)); exact identification is not possible from the image

Small ironstone pebble (likely limonite/goethite-rich concretion)

Goethite, α-FeO(OH), with possible limonite and quartz or clay impurities

Iron-stained quartz fragment

Quartz (SiO₂), likely colored by iron-oxide staining

Likely galena (lead sulfide)

Galena, PbS

Likely galena (lead sulfide)

Galena, PbS

Likely mica-rich schist

Mica schist, composed mainly of muscovite and/or biotite with quartz; exact identification is uncertain from the photo.

Mica-rich schist (possibly phyllite)

Mica schist, chiefly muscovite and/or biotite with quartz; exact identification requires testing

Small quartz crystal (likely milky quartz)

Quartz, silicon dioxide (SiO₂)

Milky quartz

Quartz (silicon dioxide, SiO₂)