Metamorphic Or Sedimentary (With Staining)

Quartzite

Quartzite (SiO2)

Yellow Quartz Pebble

Silicon Dioxide (SiO2)

Quartz Pebble

Quartz (Silicon Dioxide, SiO2)

Quartzite (River Stone)

Quartzite (mainly SiO2 with iron oxide staining)

Quartz-rich breccia or silicified rock

Microcrystalline quartz (SiO₂) with iron-oxide staining and darker host-rock fragments

Yellow Quartzite (or Quartz River Pebble)

Silicon Dioxide (SiO2)

Tumbled yellow-brown quartzite or jasper

Quartzite, predominantly microcrystalline quartz (SiO₂), possibly iron-stained jasper

Quartzite Pebble

Quartzite (primarily SiO2)

Quartzite Pebbles with Quartz Veining

SiO2 (Silicon Dioxide with country rock matrix)

River Pebble (Grey Quartzite / Sandstone Gravel)

Quartz-rich Sedimentary / Metamorphic River Pebble

Quartzite

Quartzite (SiO2)

Quartz Pebble

Silicon Dioxide (SiO2)

Common Quartz Pebble

Silicon dioxide (SiO2) rock fragment

Yellow-brown quartz-rich pebble (possibly iron-stained chert or quartzite)

Quartz (SiO₂), likely with iron-oxide staining; exact identification requires hardness and acid tests

Weathered metallic sulfide ore, likely pyrite-bearing rock

Pyrite (FeS₂), possibly in a quartz–iron-oxide host

Milky Quartz (Druzy Geode fragment)

Silicon Dioxide (SiO2)

Quartz-rich metamorphic rock, likely mica schist or quartzite

Quartz (SiO₂) with mica, feldspar, and possibly iron-oxide staining

Weathered quartz-rich rock, likely quartzite

Quartzite (mostly crystalline SiO₂), tentative identification

Weathered mica-rich metamorphic rock

Probable biotite schist or mica schist

White quartz-rich rock, likely milky quartz or quartzite

Quartz (SiO₂); possibly quartzite, a metamorphosed quartz sandstone

Kaolinite (Kaolin)

Kaolinite (Al2Si2O5(OH)4)

Quartz Pebble

Silicon Dioxide (SiO2)

Weathered quartz-rich rock, likely sandstone or quartzite

Quartz arenite (sandstone) or quartzite; predominantly SiO₂

Weathered quartz-rich pebble, possibly granite or granodiorite

Felsic intrusive rock; chiefly quartz, feldspar, and minor mica/amphibole

Tumbled banded quartzite or jasper

Silica-rich quartzite; likely iron-oxide-stained quartz (SiO₂)

Small rounded pebble, likely quartz-rich river stone

Indeterminate; likely quartz/chert-bearing lithic clast

Tumbled milky quartz

Quartz (silicon dioxide, SiO₂)

Weathered river pebble (likely iron-stained quartzite)

Quartz-rich quartzite; exact identification is uncertain from the photo

Yellow Quartzite River Cobble

Meta-quartzite (SiO2 with iron oxide staining)

Milky Quartz

Silicon Dioxide (SiO2)

Weathered quartz-rich rock, likely quartzite

Quartzite (mostly SiO₂), possibly quartz-rich sandstone or milky quartz vein material

Yellow Quartzite (River Pebble)

Quartzite (primarily SiO2)

Weathered quartz-rich rock, possibly chert or quartzite

Likely microcrystalline quartz (SiO₂), but exact identification is uncertain from the photograph

Clear Quartz Crystal

Silicon Dioxide (SiO2)

Rounded quartz-rich pebble, likely quartzite

Quartzite (mostly crystalline quartz, SiO₂)

Quartz Pebble

Silicon Dioxide (SiO2)

Quartz (Tumbled/Water-worn pebble)

Silicon Dioxide (SiO2)

Quartz-rich weathered rock, possibly quartzite

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

Quartz pebble

SiO2, Quartz

Quartzite

Quartzite (SiO2)

Weathered sandstone fragment

Quartz-rich sandstone, possibly ferruginous sandstone

Milky quartz

Quartz (silicon dioxide, SiO₂)