Mineral And Metamorphic Rock

Lapis Lazuli

Na8[Al6Si6O24]Sn (Lazurite-rich metamorphic rock)

Green Slate or Metamorphic Rock

Metamorphic rock (chlorite/actinolite-bearing)

Tumbled serpentine or serpentinite

Serpentine-group minerals, chiefly antigorite, lizardite, or chrysotile; approximate formula Mg₃Si₂O₅(OH)₄

Garnet-bearing Quartzite

Metamorphic rock containing Almandine Garnet (Fe3Al2(SiO4)3) and Quartz (SiO2)

Banded gneiss

Foliated silicate rock, typically quartz–feldspar–mica gneiss

Biotite mica

Biotite, a potassium–iron–magnesium phyllosilicate mica; approximate formula K(Mg,Fe)₃AlSi₃O₁₀(F,OH)₂

Small quartz crystal fragment (probable)

Quartz, silicon dioxide (SiO₂)

Quartz

Silicon Dioxide (SiO2)

Tumbled milky quartz

Quartz (silicon dioxide, SiO₂)

Epidosite with Quartz (Unakite-variant or Jasper)

Epidotized Metasomatite

Rounded greenstone pebble

Likely serpentinite or chlorite-rich metamorphic rock; exact identification requires testing

Polished banded gneiss

Biotite–quartz–feldspar gneiss, locally migmatitic

Banded Serpentine

Serpentine group (subgroup Lizardite or Antigorite) - Mg3Si2O5(OH)4

Milky quartz (possibly chalcedony-bearing quartz)

Quartz, silicon dioxide (SiO₂)

Epidotite (Unakite-related Epidote)

Epidote (Ca2(Al2,Fe)(SiO4)(Si2O7)O(OH))

Gneiss

Gneiss (High-grade metamorphic rock)

Quartz Pebble

Silicon Dioxide (SiO2)

Likely gneiss

Gneiss, composed chiefly of quartz, feldspar, and mica/amphibole

River Rock (Gneiss/Schist mix)

Foliated Metamorphic Rock (Gneiss)

Iron-stained quartz-rich rock, possibly quartzite or silicified breccia

Quartz (SiO₂)-dominant rock with iron-oxide minerals, chiefly hematite/goethite

Quartz with Iron Oxide Inclusions

Silicon Dioxide (SiO2)

Polished smoky quartz crystal point

Quartz (SiO₂), likely iron-colored or smoky quartz with milky inclusions

Likely quartz-rich metamorphic rock (quartzite or quartz-veined schist)

Quartzite/siliceous schist; chiefly quartz (SiO₂), with probable mica and iron-oxide staining

Greenish Feldspathic Rock / Epidote Granite (Unakite-type or Epidote-bearing rock)

Epidotized Metamorphic/Igneous Rock

Slate

Slate (Foliated Metamorphic Rock)

Tumbled quartz pebble

Quartz (SiO₂), likely milky or iron-stained quartz

Natural quartz crystal cluster / massive quartz

Quartz (silicon dioxide, SiO₂)

Quartz

Silicon Dioxide (SiO2)

Banded Agate

Cryptocrystalline variety of Quartz (SiO2)

Gneiss (Metamorphic Pebble)

Gneiss (SiO2-rich metamorphic rock)

Serpentine

Antigorite, Lizardite, or Chrysotile (Mg,Fe,Ni,Al,Zn,Mn)2-3(Si,Al,Fe)2O5(OH)4

Quartz vein in foliated metamorphic rock

Milky quartz (SiO₂) in likely schist or gneiss

Milky Quartz

Silicon Dioxide (SiO2)

Aventurine

Silicon Dioxide (SiO2) with Fuchsite inclusions

Quartzite with Pyrite Inclusions

Metamorphic Quartz-rich Rock

Orange Calcite

Calcium Carbonate (CaCO3)

Pyrite-rich Ore

Pyrite (FeS2) with secondary minerals

Rounded quartz-rich pebble

Likely granitoid-derived quartz–feldspar rock; exact identification uncertain from image

Clear quartz fragment

Quartz, silicon dioxide (SiO₂)

Biotite Schist

Biotite Schist

Tumbled honey-colored quartz (likely iron-stained quartzite)

Quartz, silicon dioxide (SiO₂); possibly quartz-rich quartzite

Milky Quartz (Quartz Vein)

Silicon Dioxide (SiO2)