Metamorphic Or Sedimentary (With Staining)

Weathered quartzite

Quartzite; predominantly recrystallized quartz (SiO₂)

Orange Quartzite (River Pebble)

Quartzite (primarily SiO2)

Milky Quartz with Iron Inclusions

Silicon Dioxide (SiO2)

Weathered sandstone or iron-rich sedimentary fragment

Quartz-rich sandstone, possibly ferruginous sandstone (SiO₂-dominant)

Likely garnet-bearing schist

Mica schist, possibly garnet-bearing; exact identification requires closer examination

Weathered, quartz-rich metamorphic rock (likely schist or gneiss)

Quartz–feldspar–mica schist/gneiss, with surface lichens and iron-oxide staining

Weathered quartz-rich metamorphic rock

Likely quartzite or quartz-rich gneiss; exact identification requires a fresh surface and testing

Greenstone

Metamorphosed Mafic Igneous Rock

Limonite (Ochreous Sandstone)

Hydrous ferric oxides (FeO(OH)qnH2O)

Yellow Quartz (Citrine/Yellow Jasper mix)

Silicon Dioxide (SiO2)

Tumbled milky quartz pebble

Quartz (silicon dioxide, SiO₂)

Orange calcite fragment

Calcite (CaCO₃), likely iron-stained or orange-colored calcite

Milky Quartz with Iron Staining

Silicon Dioxide (SiO2) with Limonite/Goethite

Quartz with Iron Stains

Silicon Dioxide (SiO2) with FeOx inclusions

Tumbled yellow jasper

Microcrystalline quartz (chalcedony), SiO₂, colored by iron oxides

Ferruginous Sandstone

Arenite with Iron-Oxide cement (Fe2O3 · nH2O)

Banded calcite (likely cave deposit or vein fragment)

Calcite, CaCO₃

Quartzite with inclusions

Metamorphic Quartzite (SiO2)

Sandstone or Quartzite with algae

Unknown specific, largely SiO2 with biological growth

Hematitic Sandstone

Sandstone with Hematite inclusions (SiO2 + Fe2O3)

Sandstone with Iron Oxide Concretions

Quartzose Sandstone with Limonite/Hematite

Likely biotite-bearing metamorphic rock (schist or gneiss)

Mica schist/gneiss; chiefly quartz, feldspar, and biotite mica

Small iron-oxide-rich rock fragment (possibly ferruginous sandstone)

Ferruginous sandstone or ironstone; likely quartz grains cemented by iron oxides such as hematite/goethite

Weathered quartz-rich cobble (probable quartzite or silicified rock)

Quartzite, predominantly SiO₂; exact identification is uncertain from the photograph

Milky Quartz

Quartz (Silicon Dioxide, SiO2)

Weathered iron-stained quartzite or sandstone cobble

Quartzite (quartz, SiO₂), possibly ferruginous sandstone

Quartz-veined metamorphic cobble

Likely quartzite or quartz-rich metasedimentary rock; veins predominantly quartz (SiO₂)

Likely iron-rich sandstone or weathered hematite-bearing rock

Quartz-rich sandstone, possibly ferruginous sandstone (SiO₂ with iron oxides such as hematite/goethite)

Quartz-rich rock, likely milky quartz or quartzite

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

Weathered green metamorphic rock, possibly serpentinite or greenstone

Likely serpentinite (serpentine-group minerals) or chlorite/epidote-rich greenschist; exact identification requires testing

Likely weathered schist or gneiss fragment

Micaceous quartz-feldspar metamorphic rock; exact identification requires testing

Mica schist

Muscovite–biotite schist, composed mainly of mica and quartz

Polished jasper pebble

Jasper, microcrystalline quartz (SiO₂) with iron-oxide and clay-mineral impurities

Schist

Mica Schist (Metamorphic Rock)

Quartz pebble with iron staining

Silicon dioxide (SiO2) with iron oxide inclusions

Feldspar (with Quartz / Iron Staining)

Potassium Feldspar / Plagioclase (KAlSi3O8 - NaAlSi3O8 to CaAl2Si2O8)

Quartzite with Iron inclusions

Quartzite (SiO2 with Fe2O3 trace impurities)

Iron-stained quartz-rich rock, likely ferruginous quartzite

Quartzite (predominantly SiO₂) stained by iron oxides, likely hematite and goethite

Polished brecciated jasper

Jasper; microcrystalline quartz (SiO₂) with iron-oxide staining and dark mineral fragments

Tumbled yellow quartz-rich stone, likely yellow jasper or quartzite

Jasper/quartzite; mainly microcrystalline quartz (SiO₂), with iron-oxide staining

Yellow-orange iron-stained quartzite

Quartzite, composed predominantly of quartz (SiO₂) with iron-oxide staining

Quartzite

Quartzite (SiO2)