Metamorphic, Likely Sedimentary With Quartz Veins

Milky quartz crystal

Quartz, silicon dioxide (SiO₂)

Quartz-rich rock, likely quartzite

Quartzite, composed predominantly of quartz (SiO₂)

Milky quartz with iron-oxide staining

Quartz (SiO₂), likely with goethite/limonite coatings

Quartz-rich vein fragment, possibly quartz with mica or calcite

Quartz (SiO₂), with probable muscovite/biotite mica and minor feldspar or calcite

Weathered iron-rich quartz vein in altered host rock

Goethite–hematite limonite with quartz and iron-oxide alteration

Rounded pebble, likely mixed lithology

Lithology uncertain; possibly a fine-grained metamorphic or volcanic rock with a quartz-rich/pink feldspar vein or inclusion

Banded calcite (likely cave deposit or vein fragment)

Calcite, CaCO₃

Weathered quartz-rich rock, likely quartzite

Quartzite (mostly microcrystalline quartz, SiO₂), possibly weathered quartz vein material

Quartz

Silicon Dioxide (SiO2)

Quartz-rich sandstone or quartzite

Quartz (SiO₂)-rich clastic rock; possibly weakly metamorphosed quartzite

Serpentinite-bearing quartz vein rock

Serpentinite (antigorite/lizardite) with milky quartz; possible chlorite or epidote alteration

Tumbled pale quartz (possibly milky quartz or calcite)

Quartz, SiO₂; visual identification is uncertain because the specimen is poorly lit and polished

Milky quartz (likely quartz vein fragment)

Quartz, silicon dioxide (SiO₂)

Gneiss

Feldspar–quartz–mica gneiss, locally amphibole-bearing

Quartz-rich breccia or quartz vein fragment

Silica, primarily quartz (SiO₂), with possible chlorite, feldspar, or iron-oxide inclusions

Banded gneiss pebble

Gneiss, likely quartz–feldspar–mica gneiss

Tumbled milky quartz

Quartz (silicon dioxide, SiO₂), commonly called white or milky quartz

Quartzite and Milky Quartz River Pebbles

Silicon Dioxide (SiO2)

Pyrite (likely), “fool’s gold”

Pyrite, FeS₂ (iron disulfide)

Milky Quartz

Quartz (Silicon Dioxide, SiO2)

Milky quartz pebble

Quartz, silicon dioxide (SiO₂)

Rounded dark metamorphic pebble

Likely mica schist or chlorite-rich greenschist; exact identification requires testing

Quartz fragment (likely milky quartz)

Quartz, silicon dioxide (SiO₂)

Iron-stained quartz-rich rock, possibly limonite-bearing quartzite

Quartz (SiO₂) with iron oxides/hydroxides, chiefly hematite and goethite

Weathered quartz-rich rock, likely chert or quartzite

Microcrystalline quartz (SiO₂), possibly with iron-oxide staining

Milky quartz-rich rock

Quartz (SiO₂), likely massive milky quartz with minor iron-stained gangue

Mica Schist with Quartz

Mica-Quartz Schist (Muscovite subclass)

Tumbled quartz-rich pebble, possibly smoky quartz or chert

Quartz (SiO₂), or microcrystalline quartz if chert

Iron-stained quartz vein rock

Quartz-rich vein material with iron oxides/hydroxides (quartz, SiO₂, stained by hematite/goethite); likely hosted in a metamorphic rock

Tumbled cream-colored stone, likely milky quartz

Quartz (SiO₂), probably massive/milky quartz

Quartz-rich metamorphic rock, likely mica schist or quartzite

Quartz (SiO₂) with probable mica, feldspar, and dark accessory minerals

Quartz-rich rock, possibly milky quartz or quartzite

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

Iron-stained milky quartz

Quartz (SiO₂), with iron-oxide staining

Likely milky quartz

Quartz (silicon dioxide, SiO₂)

White quartz pebble (likely milky quartz)

Quartz, silicon dioxide (SiO₂)

Milky quartz (possibly chalcedony)

Quartz, SiO₂; likely massive or cryptocrystalline quartz

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

Pyrite, FeS₂, intergrown with quartz and/or mica-rich matrix

White Quartz (Milky Quartz)

Silicon Dioxide (SiO2)

Quartz

Silicon Dioxide (SiO2)

White quartz-rich pebble, possibly milky quartz

Quartz (silicon dioxide, SiO₂), likely massive milky quartz

Milky quartz (likely weathered quartzite or quartz vein fragment)

Quartz, silicon dioxide (SiO₂)

Milky quartz (likely iron-stained quartz)

Quartz, silicon dioxide (SiO₂)