Garnet-bearing metamorphic rock, possibly garnet amphibolite or mica schist
Almandine garnet (Fe₃Al₂Si₃O₁₂) in a mafic, amphibole–feldspar-rich matrix
metamorphic
Category
Metamorphic Or Igneous
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Gneiss
Metamorphic Gneiss
metamorphic
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)
Mineral
Banded Basalt / Lave Stone or Gneiss Pebble
Igneous/Metamorphic banded pebble
igneous
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Clear Quartz
Silicon dioxide (SiO2)
mineral
Milky Quartz
Quartz (Silicon Dioxide, SiO2)
mineral
Quartz with Iron Staining
Silicon Dioxide (SiO2)
mineral
Milky Quartz
Crystalline Silicon Dioxide (SiO2)
mineral
Quartz Crystal Cluster
Silicon Dioxide (SiO2)
mineral
Greenschist
Chlorite Schist
metamorphic
Hypersthene
Hypersthene ((Mg,Fe)SiO₃)
Mineral
Greenish Metamorphic Rock (likely containing epidote or chlorite)
Metamorphic rock, possibly epidosite or greenstone
Metamorphic
Quartz
Silicon dioxide (SiO2)
mineral
Clear Quartz (Faceted)
SiO2 - Silicon Dioxide
gemstone
Faceted Clear Quartz or Diamond Simulant
Silicon Dioxide (SiO2) if Quartz or Cubic Zirconia (ZrO2) if Synthetic
gemstone
Pyrite
Iron Sulfide (FeS2)
mineral
Quartz
Silicon Dioxide (SiO2)
mineral
Quartz / Feldspar Specimen
SiO2 (Quartz) / KAlSi3O8 - NaAlSi3O8 - CaAl2Si2O8 (Feldspar Group)
mineral
Quartz (Pebble)
Silicon Dioxide (SiO2)
mineral
Black Tourmaline (Schorl)
NaFe3+3Al6(BO3)3Si6O18(OH)4
mineral
Quartz Crystal Rock
Silicon Dioxide (SiO2)
mineral
Agate
Silicon Dioxide (Chalcedony), SiO2
gemstone
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Quartz with inclusions
SiO2
mineral
Reddish-brown crystalline rock, possibly weathered granite or garnet-bearing schist
Indeterminate; likely quartz–feldspar–mica rock with iron oxides, potentially garnet-bearing
metamorphic
Corundum
Corundum (Aluminium oxide, Al2O3)
mineral
Polished gray stone, likely labradorite or gneiss
Indeterminate from image; possibly plagioclase-rich gneiss or labradorite-bearing rock
mineral
Sodalite
Na8(Al6Si6O24)Cl2
mineral
Labradorite (a variety of Feldspar)
Labradorite; (Na,Ca)(Al,Si)4O8 (a plagioclase feldspar)
igneous
Biotite mica
Biotite, a potassium-rich mica in the annite–phlogopite series; approximate formula K(Mg,Fe)₃AlSi₃O₁₀(F,OH)₂
mineral
Biotite mica (likely)
Biotite, a mica-group mineral; approximate formula K(Mg,Fe)₃AlSi₃O₁₀(F,OH)₂
mineral
Muscovite Mica
Muscovite (KAl2(AlSi3O10)(OH)2)
mineral
Muscovite Mica
Muscovite (KAl2(AlSi3O10)(OH)2)
mineral
Labradorite
(Na, Ca)(Si, Al)4O8
mineral
Quartz fragment
Quartz (silicon dioxide, SiO₂)
mineral
Muscovite Mica
Muscovite / KAl2(AlSi3O10)(OH)2
mineral
Black Spinel
Magnesium Aluminum Oxide (MgAl2O4)
mineral
Quartz-rich pebble
Mostly quartz (SiO₂), possibly a quartzite or vein-quartz fragment
mineral
Likely weathered gneiss or mica-rich schist
Foliated metamorphic rock, probably quartz–feldspar–biotite gneiss/schist
metamorphic
Pyrite
Iron Sulfide (FeS2)
mineral
Sodalite
Sodalite (Na8Al6Si6O24Cl2)
mineral