Metamorphic, Likely Sedimentary With Quartz Veins

Weathered gray metamorphic rock, likely schist or slate

Foliated silicate rock; possibly mica schist or phyllite

Tumbled orange jasper/quartzite pebble

Jasper, microcrystalline quartz (SiO₂), likely iron-oxide colored

Small quartz fragment

Quartz (silicon dioxide, SiO₂), possibly milky quartz

Tumbled quartz-rich pebble

Microcrystalline quartz (SiO₂), possibly milky quartz or chalcedony

Dark metamorphic cobble, likely slate or phyllite

Foliated metamorphic rock, probably carbonaceous slate/phyllite; exact identification requires testing

Rounded river cobbles, likely weathered sandstone/mudstone and quartz-rich rock

Uncertain from photograph; probable lithologies include quartz sandstone, siltstone/mudstone, and locally altered volcanic or metamorphic clasts

Tumbled quartz (likely milky/rose quartz)

Quartz, silicon dioxide (SiO₂)

Quartz crystal fragment

Quartz (silicon dioxide, SiO₂)

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

Quartz (SiO₂), likely in a quartzite or quartz-vein matrix with iron oxides

Tumbled quartz (likely rose or milky quartz)

Quartz, silicon dioxide (SiO₂)

Likely amphibolite

Amphibolite, composed mainly of hornblende and plagioclase feldspar

Tumbled white quartz (likely milky quartz)

Quartz, silicon dioxide (SiO₂)

Raw quartz crystal

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

Mixed mineral and rock specimen collection

Assorted silicates, carbonates, oxides, and sulfides; individual species cannot be reliably identified from this image

Tumbled quartz-rich pebble

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

Tumbled quartz pebble (probable)

Quartz, silicon dioxide (SiO₂)

Tumbled quartz (likely milky or rose quartz)

Quartz, silicon dioxide (SiO₂)

Milky quartz fragment

Quartz (silicon dioxide, SiO₂)

Greenish translucent glassy mineral specimen, possibly fluorite or quartz

Likely fluorite (CaF₂) or green quartz (SiO₂); exact identification requires hardness and cleavage tests

Tumbled milky quartz

Quartz (silicon dioxide, SiO₂)

Milky quartz

Quartz (silicon dioxide, SiO₂), likely a massive vein-quartz specimen

Quartz crystal (likely clear quartz)

Quartz, silicon dioxide (SiO₂)

Likely graywacke or fine-grained metamorphic rock

Quartz–feldspar–mica-rich lithic sandstone (tentative; image alone is insufficient for exact identification)

Clear Quartz

Silicon Dioxide (SiO2)

Milky quartz (likely)

Quartz, silicon dioxide (SiO₂)

Mixed Rock and Mineral Collection

Mixed Assemblage (includes Quartz, Jasper, Feldspar, and Turquoise-colored stones)

Quartz (Milky/Gravel variety)

Silicon Dioxide (SiO2)

Pyrite-bearing schist or quartzite

Micaceous quartz-rich metamorphic rock with pyrite (FeS₂)

Weathered quartz-rich rock, possibly quartzite or vein quartz

Quartzite (mostly SiO₂), but exact identification is uncertain from the image

Banded metamorphic river cobble, likely gneiss or metasedimentary rock

Quartz–feldspar–mica gneiss or quartzite with cross-cutting quartz veins

Yellow Quartz

Silicon Dioxide (SiO2)

Milky Quartz

Silicon Dioxide (SiO2)

Pyrite-bearing quartz specimen

Pyrite (FeS₂) with quartz (SiO₂), possibly minor mica or chalcopyrite

Small quartz-rich pebble, possibly milky quartz

Quartz (silicon dioxide, SiO₂)

Yellow-orange quartz/chalcedony pebble (possibly citrine-bearing)

Quartz, SiO₂; likely microcrystalline chalcedony with iron staining

Milky quartz vein rock

Quartz, silicon dioxide (SiO₂), likely massive vein quartz with iron-oxide staining

Banded slate or phyllite

Fine-grained foliated metasedimentary rock; likely slate with light-colored quartz veins

Weathered quartz-rich rock, likely milky quartz or quartzite

Quartz (SiO₂), possibly quartzite with iron-oxide staining

Tumbled milky quartz

Quartz (silicon dioxide, SiO₂)

Quartz-veined metamorphic rock, likely schist or gneiss

Quartz–feldspar–mica rock; exact identification requires testing

Likely weathered quartz-rich rock fragment

Uncertain; possibly quartz-bearing granitic or metamorphic material (SiO₂-dominant)

Quartz Pebble

Silicon Dioxide (SiO2)