Metamorphic, Likely Sedimentary With Quartz Veins

Iron-stained quartz vein in altered host rock

Quartz (SiO₂) with iron oxides/hydroxides, likely hematite and goethite; host rock uncertain from the image

Quartz-veined metamorphic rock

Likely quartz-veined schist or gneiss; exact identification requires closer examination

Milky quartz with possible feldspar

Quartz (SiO₂), possibly intergrown with feldspar

Quartz Veined Quartzite or Sandstone

Quartzite with Quartz Veins (SiO2)

Dark gneiss or banded metamorphic rock

Banded quartz–feldspar–mica gneiss; exact identification requires testing

Gneiss, likely migmatitic or granitic gneiss

Banded quartz–feldspar–mica gneiss; composition chiefly quartz, alkali/plagioclase feldspar, biotite and accessory minerals

White Quartz Beads

Silicon Dioxide (SiO2)

Mixed mineral and rock collection, including likely amethyst and assorted tumbled stones

Unidentified mixed specimens; visible purple quartz is likely amethyst (SiO₂)

Milky quartz

Quartz, silicon dioxide (SiO₂)

Milky quartz (likely quartz-rich vein fragment)

Quartz, silicon dioxide (SiO₂)

Yellow Calcite

Calcium Carbonate (CaCO3)

Milky quartz with iron-oxide staining

Quartz (SiO₂), likely massive or vein quartz

Milky quartz

Quartz (silicon dioxide, SiO₂)

Milky quartz (rough quartz-rich rock)

Quartz, silicon dioxide (SiO₂); likely massive milky quartz, possibly quartzite

Pyrite (likely)

Pyrite, FeS₂

Unidentified translucent mineral fragment, possibly quartz

Likely quartz (SiO₂), though the photograph is insufficient for confident identification

Quartz

Silicon dioxide (SiO2)

Quartz

Silicon Dioxide (SiO2)

Iron-stained quartz or quartz-rich fragment

Quartz (SiO₂), possibly with limonite/goethite staining

Clear quartz pebble

Quartz (silicon dioxide, SiO₂)

Small pale stone, possibly quartz or limestone

Indeterminate from image; likely quartz (SiO₂) or calcite-rich limestone (CaCO₃)

Metallic sulfide-bearing pebble, likely pyrite in quartz or host rock

Probable pyrite (FeS₂), possibly with chalcopyrite (CuFeS₂) in a quartz-rich matrix

Tumbled jasper pebble

Silica-rich microcrystalline quartz/chalcedony, commonly brecciated or iron-stained jasper (SiO₂)

Quartz vein in greenstone

Milky quartz (SiO₂) cutting metamorphosed mafic rock, likely greenschist or amphibolite

Milky quartz (likely)

Quartz, silicon dioxide (SiO₂)

Milky quartz (likely quartz crystal)

Quartz, silicon dioxide (SiO₂)

Iron-stained quartz-rich rock (probable quartzite or silicified breccia)

Quartz-dominant aggregate, chiefly SiO₂, with iron oxides/hydroxides

Quartz-rich rock fragment, possibly milky quartz or quartzite

Quartz (SiO₂); probable quartzite if recrystallized sandstone

Milky Quartz with Iron Inclusions

Silicon Dioxide (SiO2)

Quartz Vein in Mica Schist

Quartz (SiO2) with Muscovite/Biotite Schist

Milky quartz-bearing rock, possibly quartzite or quartz vein

Quartz (SiO₂), likely with feldspar and minor iron-oxide inclusions

Tumbled honey-colored quartz (likely iron-stained quartzite)

Quartz, silicon dioxide (SiO₂); possibly quartz-rich quartzite

Clear quartz fragment

Quartz (silicon dioxide, SiO₂)

Iron-stained quartz vein rock

Quartz-rich rock with iron-oxide/hydroxide coatings (hematite/goethite); exact host rock undetermined

Quartz-rich rock fragment, possibly milky quartz

Quartz (SiO₂), likely a small vein-quartz or quartz-bearing rock fragment

Milky Quartz

Silicon Dioxide (SiO2)

Tumbled white quartz

Quartz (silicon dioxide, SiO₂), likely milky quartz

Rounded quartz-rich pebble

Likely microcrystalline quartz (SiO₂), possibly milky quartz or a pale quartzite fragment

Pyrite-bearing rock (likely pyrite-rich schist or quartzite)

Pyrite, FeS₂, disseminated in a metamorphic host rock

Quartzite with inclusions or a banded chert

Quartzite or Chert

Rounded quartz pebble

Quartz (SiO₂), possibly milky or smoky quartz

Iron-stained quartz/quartzite fragment

Quartz (SiO₂), likely massive quartz with limonite/goethite staining