Sedimentary And Metamorphic

Jasper

Silicon Dioxide (SiO2) with impurities

Garnet

Garnet group: X3Y2(SiO4)3 (commonly Almandine-Pyrope series)

Polished pink quartzite or jasper

Quartzite, predominantly SiO₂; possibly iron-stained jasper/chalcedony

Mica-rich schist

Muscovite–biotite schist, commonly quartz-bearing

Yellow Jade or Honey Calcite

Nephrite or Jadeite variety, or crystalline Calcium Carbonate (CaCO3)

Tiger Iron

Tiger Iron (Composition: SiO2, Fe2O3, Fe3O4)

Banded Gneiss

Gneiss (High-grade Regional Metamorphic Rock)

Calcite

Calcite (CaCO3)

Quartz (in a rock matrix)

Quartz (SiO2)

White Marble

Recrystallized Calcite (CaCO3)

Tumbled red jasper with a quartz vein

Jasper (microcrystalline quartz, SiO₂), likely crossed by milky quartz

Quartzite

Quartzite (primarily SiO₂)

Gneiss (specifically Biotite Gneiss)

Gneiss (high-grade metamorphic rock primarily composed of Silicates)

Quartz Pebble

Silicon Dioxide (SiO2)

Biotite (Mica)

Biotite group (K(Mg,Fe)3AlSi3O10(F,OH)2)

Blue Agate (Dyed Chalcedony)

Silicon Dioxide (SiO2)

Quartz Pebble

Silicon Dioxide (SiO2)

Quartzite

Quartzite (primarily SiO2)

Petrified Wood

Silicified Wood (primarily Quartz / Chalcedony: SiO2)

Almandine Garnet (weathered)

Almandine (Fe3Al2(SiO4)3)

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

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

Granitic Gneiss

Gneiss (Complex silicate composition)

Anthracite Coal

Anthracite

Aventurine (Green)

Silicon Dioxide (Quartz) with inclusions typically of Fuchsite; SiO2

Gneiss

Gneiss

Quartzite River Rock

Quartzite (SiO2)

Petrified Wood

Silicified wood (Quartz, SiO2)

Gneiss

Gneiss (High-grade regional metamorphic rock)

Weathered quartz-rich rock, likely sandstone or quartzite

Quartz arenite (sandstone) or quartzite; predominantly SiO₂

Red Jasper (Banded Jasper)

Silicon Dioxide (SiO2) with Hematite impurities

Petrified Wood

Silicified Wood (SiO2)

Banded Gneiss

Gneiss (High-grade Metamorphic Rock)

Gneiss

Gneiss (quartz-feldspar-biotite gneiss)

Gneiss

Gneiss (High-grade metamorphic rock)

Quartz

Quartz (SiO₂)

Pyrite in Quartz

Iron Sulfide (FeS2) in Silicon Dioxide (SiO2)

Gneiss (specifically a granitic gneiss cobble)

Gneiss (high-grade regional metamorphic rock)

Hematite / Jasper

Iron(III) oxide (Fe2O3) in Quartz (SiO2)

Petrified Wood

Silicified Wood (primarily SiO₂ - Silicon Dioxide)

Weathered quartz-rich pebble (tentative)

Likely quartz/chalcedony, SiO₂, possibly iron-stained

Tumbled quartz (likely rose or milky quartz)

Quartz, silicon dioxide (SiO₂)

Tumbled orange calcite

Calcite (calcium carbonate, CaCO₃)