Metamorphic, Likely Sedimentary With Quartz Veins

Quartz-veined metamorphic rock, likely mica schist

Mica schist with a milky-quartz vein; predominantly quartz, feldspar, and biotite/muscovite mica

Quartz-veined metamorphic rock, likely schist or phyllite

Quartz-bearing mica schist/phyllite; exact identification requires closer examination

Rounded quartz-rich pebble (likely vein quartz or quartzite)

Quartz, silicon dioxide (SiO₂); possibly quartzite if metamorphic

Small quartz-rich pebble or rock fragment

Quartz (silicon dioxide, SiO₂), possibly with iron-oxide staining or host-rock inclusions

Small pale mineral fragment

Indeterminate; possibly quartz or calcite

Quartz-rich river pebble, likely milky quartz

Milky quartz (SiO₂), possibly a quartzite or quartz-rich silicate pebble

Clear quartz crystals

Quartz (silicon dioxide, SiO₂)

Milky quartz-bearing rock, possibly quartzite

Quartz (SiO₂), likely in a quartzite or quartz-rich vein

Quartz Pebble

Crystalline Silicon Dioxide (SiO2)

Quartz-veined metamorphic rock, likely schist or gneiss

Micaceous quartz-feldspar rock; probable mica schist/gneiss with quartz veins

Tumbled orange-brown quartz pebble

Likely iron-stained quartz or chalcedony (SiO₂)

Clear quartz fragment

Quartz (silicon dioxide, SiO₂)

Quartz

Silicon Dioxide (SiO2)

Banded quartz-rich metamorphic rock (likely quartzite or quartz-mica schist)

Quartzite/schist composed chiefly of SiO₂ quartz with mica, feldspar, and iron-oxide or copper-colored accessory minerals

Weathered quartz-rich metamorphic rock

Likely quartzite or quartz-veined schist; primarily SiO₂ with possible mica, feldspar, and iron oxides

Quartz-rich rock, likely milky quartz vein material

Mostly quartz (SiO₂); exact rock type cannot be determined from the image alone

Quartz (Milky Variant)

Quartz (Silicon Dioxide, SiO2)

Quartz-rich rock, likely milky quartz with iron staining

Quartz (SiO₂), possibly quartzite or quartz vein material

Iron-stained quartz fragment (probable quartzite or chert)

Quartz, SiO₂; possibly iron-oxide-stained microcrystalline silica

Quartz-rich pebble

Mostly quartz (SiO₂), possibly a quartzite or vein-quartz fragment

Small white mineral fragment

Likely quartz (SiO₂), possibly calcite (CaCO₃)

Banded metamorphic rock, likely gneiss

Banded quartzofeldspathic gneiss (probable paragneiss or orthogneiss)

Banded gneiss (likely weathered paragneiss)

Gneiss; quartz–feldspar–mica ± amphibole assemblage

Milky quartz pebble

Quartz (silicon dioxide, SiO₂)

Milky quartz vein fragment

Quartz (silicon dioxide, SiO₂), massive or granular variety

Tumbled quartz-rich carbonate rock

Likely massive quartz (SiO₂), possibly calcite-bearing marble or limestone

Small quartz crystal fragment (probable)

Quartz, silicon dioxide (SiO₂)

Tumbled quartz pebble, possibly citrine or pale smoky quartz

Quartz (SiO₂), likely microcrystalline/tumbled material

Quartz (Milky or Citrine-tinted)

Silicon Dioxide (SiO2)

Quartz-rich mineral fragment

Quartz (silicon dioxide, SiO₂), possibly milky quartz

Clear quartz fragment

Quartz (silicon dioxide, SiO₂)

Milky Quartz with Iron Inclusions

Quartz (Silicon Dioxide, SiO2)

Likely pyrite-bearing rock

Pyrite (FeS₂), possibly in a quartz- or sulfide-rich matrix

Likely quartz fragment

Quartz (silicon dioxide, SiO₂), possibly milky quartz or quartz-rich rock

Quartz (Milky/Clear variety)

Silicon Dioxide (SiO2)

Quartz-rich vein rock, likely milky quartz in schist

Milky quartz (SiO₂) with probable mica schist/greenschist host rock

Small tumbled quartz-like pebble

Likely quartz (SiO₂), possibly iron-stained chalcedony or feldspar

Banded metamorphic rock, likely gneiss or banded amphibolite

Quartz–feldspar–biotite gneiss or amphibolite; exact identification requires thin-section or mineral tests

Quartz-bearing metamorphic rock, likely quartzite or hornfels

Quartz (SiO₂) in a fine-grained silicate matrix; exact rock identification requires testing

Milky quartz pebble

Quartz, silicon dioxide (SiO₂)

Quartz crystal-bearing rock

Quartz (SiO₂), likely a milky/clear quartz vein specimen

Likely slate or fine-grained metamorphic rock

Slate; predominantly microcrystalline quartz, mica, and clay minerals