Metamorphic (Man Made)

Granite (weathered pebble)

Granite (plutonic igneous rock)

Igneous

Quartz

Silicon Dioxide (SiO2)

Granitic Gneiss

Gneiss (High-grade Metamorphic Rock)

Unakite

Epidotized Granite

Quartzite

Quartzite (Primary mineral: Quartz, SiO2)

Quartz

Quartz (SiO2 - Silicon Dioxide)

Clear Quartz

Quartz (Silicon Dioxide, SiO2)

Yellow Agate

Agate (Microcrystalline Silicon Dioxide, SiO2)

Quartzite River Rock

Quartzite (SiO2)

Gneiss (likely)

Gneiss

Metamorphic

Serpentine

Serpentinite (a rock composed primarily of serpentine minerals like antigorite, chrysotile, and lizardite; general formula (Mg, Fe)3Si2O5(OH)4)

Clear Quartz (Rock Crystal)

Quartz (SiO₂)

Schist

Schist (various mineralogical compositions including mica, chlorite, talc, etc.)

Metamorphic

Quartzite Pebble (River Rock)

Quartzite (primarily SiO2)

Quartzite

Quartzite (primarily SiO2)

Banded Iron Formation (BIF) / Tiger Iron

Ferruginous Chert (primarily Quartz [SiO2] and Hematite/Magnetite [Fe2O3/Fe3O4])

Red Quartzite Cobble

Quartzite (primarily SiO2)

Metamorphic Rock (specifically a rock composed of minerals)

Ruby in Zoisite

Ruby (Corundum, Al2O3) in Zoisite (Calcium aluminum silicate hydroxide, Ca2Al3(SiO4)3(OH)) with some Hornblende

Quartzite

Quartzite (SiO2)

Hypersthene (or Enstatite/Ferrosilite)

Orthopyroxene series (Mg,Fe)SiO3 - specifically, historically hypersthene (intermediate member) now referred to as Enstatite (Mg-rich) or Ferrosilite (Fe-rich)

Quartzite

Quartzite (primarily Silicon Dioxide, SiO2)

Lapis Lazuli

Lapis Lazuli (a rock composed primarily of Lazurite (Na,Ca)₈[(S,Cl,SO₄,OH)₂|(Al₆Si₆O₂₄)], with varying amounts of Calcite, Pyrite, and Sodalite.)

Gneiss

Gneiss (pronounced 'nice')

Metamorphic Rock

Quartz

Silicon Dioxide (SiO2)

Blue Apatite

Fluorapatite (Ca5(PO4)3F)

Metamorphic or Sedimentary (with staining)

Pink Stained Rock (Likely Quartzite or Sandstone with Iron Oxide Staining)

Quartzite (metamorphic) or Sandstone (sedimentary); coloration likely due to hematite or other iron oxides.

Milky Quartz

Silicon dioxide (SiO2)

Gneiss

Gneiss (a metamorphic rock)

Metamorphic

Quartz

Quartz (SiO2 - Silicon Dioxide)

Banded Gneiss

Gneiss (High-grade Regional Metamorphic Rock)

Zoisite with Ruby (Anyolite)

Anyolite (Ca2Al3(SiO4)3(OH) + (Hb, Al, Cr)2O3)

Soapstone

Steatite (composed primarily of Talc: Mg3Si4O10(OH)2)

Quartzite pebble

Quartzite (SiO2)

Massive Quartz with Host Rock

Silicon Dioxide (SiO2)

Fluorite-Gedrite in Quartz (Schist)

Fluorite (CaF2) with Gedrite in Quartz/Feldspar Matrix

Granitic Gneiss

Gneiss (Polymetamorphic Granitic Gneiss)

Quartz

Quartz (SiO₂ - Silicon Dioxide)

Quartz

Quartz (SiO2 - Silicon Dioxide)

Quartz

Quartz (SiO₂)

Rhodonite

Rhodonite (MnSiO3)

Milky Quartz

Quartz (SiO2)