Metamorphic Or Sedimentary (With Staining)

Schist

Mica Schist

Ferruginous Quartz

Silicon Dioxide with Iron Oxide (SiO2 + Fe2O3)

Rounded orange-brown pebble (likely iron-stained quartzite)

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

Weathered sandstone or iron-stained quartzite

Quartz-rich sandstone; possibly weakly metamorphosed quartzite (SiO₂ with iron-oxide coatings)

Weathered quartz-rich rock, possibly quartzite or silicified sandstone

Quartz-dominant aggregate; likely microcrystalline quartz (SiO₂), but exact identification requires testing

Unidentified greenish-gray rock fragment

Tentatively altered basalt or basaltic volcanic rock; mineral identification requires testing

Quartzite River Cobble

Quartzite (SiO2)

Quartzite

Quartzite (SiO2)

Milky quartz vein fragment

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

Iron-rich quartz pebble

Quartz (SiO₂) with iron-oxide staining or inclusions; exact identification is uncertain from the photo

Polished brecciated jasper (likely ocean jasper or orbicular jasper)

Microcrystalline quartz/chalcedony (SiO₂) with iron-oxide and other mineral inclusions

Banded metamorphic rock, likely gneiss

Biotite–quartz–feldspar gneiss (probable); exact identification requires testing

River Stone (Quartzite/Chert)

Metamorphosed Quartz-rich Sedimentary Rock

Milky quartz pebble

Quartz (silicon dioxide, SiO₂)

Likely weathered gneiss

Banded quartz–feldspar–mica gneiss

Weathered quartz-mica schist

Quartz–muscovite/biotite schist, locally iron-oxide stained

Quartzite

Quartzite; predominantly microcrystalline quartz (SiO₂)

Tumbled quartz-rich carbonate rock

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

Quartzite

Metamorphosed Quartz Sandstone (SiO2)

Pyrite-bearing metamorphic rock (likely schist or quartzite)

Mica/quartz-rich metamorphic matrix with pyrite (FeS₂), possibly chalcopyrite (CuFeS₂)

Milky Quartz Pebble with Iron Inclusions

Silicon Dioxide (SiO2) with iron oxide impurities

Dark metamorphic rock, likely biotite schist or gneiss

Quartz–feldspar–biotite metamorphic rock; exact identification requires a fresh surface and testing

Rock crystal quartz fragment

Quartz (silicon dioxide, SiO₂)

Weathered metamorphic rock, likely schist or slate

Foliated pelitic metamorphic rock; commonly muscovite–chlorite schist or phyllite

Quartz (Citrine or Iron-Stained)

Silicon Dioxide (SiO2)

Quartz with Iron Stains

Quartz (SiO2) with iron oxide/hydroxide staining

Quartzite Pebble (River Rock)

Quartzite (mainly SiO2)

Red Jasper

Red Jasper (SiO2)

Gneiss

Felsic banded gneiss, chiefly quartz–feldspar–mica

Banded gneiss pebble

Gneiss, chiefly quartz–feldspar–mica; exact variety indeterminate from image

Rounded quartz-rich cobble, possibly quartzite

Quartzite (mostly microcrystalline quartz, SiO₂); identification tentative from the photograph

Quartz vein specimen

Quartz (SiO₂), likely drusy or massive quartz on host rock

Quartzite River Rock

Quartzite (primarily SiO2)

Possible iron-stained quartzite or sandstone fragment

Quartzite (mostly SiO₂), possibly ferruginous sandstone

Milky Quartz (or Vein Quartz)

Silicon Dioxide (SiO2)

Auriferous Quartz (Gold-bearing Quartz)

Silicon Dioxide (SiO2) with trace Gold (Au) and Iron Oxides

Quartz vein in weathered host rock

Milky quartz (SiO₂), likely in a feldspathic or carbonate-rich matrix

Yellow Quartzite or Yellow Jasper

Quartzite (primarily SiO2 with Iron oxide staining)

Tumbled quartz pebble

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

Weathered quartz-rich metamorphic pebble

Likely quartzite or quartz-mica schist; identification is uncertain from the photograph

Quartz pebble

Silicon Dioxide (SiO2)

Iron-stained quartz-rich rock (likely quartzite or quartz vein material)

Quartz (SiO₂), commonly with limonite/goethite iron oxides; possible quartzite matrix