Sedimentary Or Metamorphic (Low Grade)

Serpentine

Antigorite, Lizardite, or Chrysotile (Mg, Fe)3Si2O5(OH)4

Green Aventurine

Quartzite (variety Aventurine) with Fuchsite inclusions (K(Al,Cr)2(AlSi3O10)(OH)2)

Mica Schist with Pyrite

Muscovite/Biotite Schist with Iron Sulfide (FeS2)

Clear Quartz

Silicon Dioxide (SiO2) / Rock Crystal

Gneiss (specifically a weathered or stream-worn specimen)

Gneiss (Foliated Metamorphic Rock)

Greenschist

Greenschist (Chlorite Schist)

Amygdaloidal Basalt with Epidote/Chlorite

Basalt (containing (Ca2(Al2Fe3+)(SiO4)(Si2O7)O(OH)))

Pyrite (Iron Pyrite)

Iron Sulfide (FeS2)

Almandine Garnet

Almandine, Fe3Al2(SiO4)3

Nephrite Jade

Ca2(Mg,Fe)5Si8O22(OH)2

Amazonite

K(AlSi3O8), Microcline (potassium feldspar)

Sulfur

Sulfur (S8)

Gneiss

Gneiss (High-grade metamorphic rock composed primarily of Quartz, Feldspar, and various Micas)

Blue Kyanite

Kyanite (Al2SiO5)

Eclogite

Eclogite (Pyrope-Omphacite rock)

Sapphirine in Magnesian Schist

Sapphirine: (Mg,Al)8(Al,Si)6O20

Pyrite (Fool's Gold)

Iron Disulfide (FeS2)

Clear Quartz

Quartz (Silicon Dioxide, SiO2)

Clear Quartz

Silicon Dioxide (SiO2)

Gneiss

Gneiss (High-grade metamorphic rock typically composed of Quartz, Feldspar, and Mica/Amphibole)

Rhodonite with Manganese Oxides

Rhodonite (Mn,Fe,Mg,Ca)SiO3

Arsenic (Native)

Arsenic (As)

Osumilite in Granite Matrix

(K,Na)(Fe,Mg)2(Al,Fe)3(Si,Al)12O30

River Cobble (Gneiss/Migmatite)

Gneissic Metamorphic Rock (composed mainly of Quartz, Feldspar, and Biotite)

Quartzite

Quartzite (chiefly SiO2)

Clear Quartz (Rock Crystal)

Silicon Dioxide (SiO2)

Quartz (Clear Quartz/Rock Crystal)

Silicon Dioxide (SiO2)

Clear Quartz (Rock Crystal)

Silicon Dioxide (SiO2)

Diamond

Diamond (C)

Schist (Micaceous)

Mica Schist (predominantly Muscovite or Biotite)

Peridotite (with Olivine and Pyroxene)

Ultramafic Magmatic Rock (Primary minerals: (Mg, Fe)2SiO4 and (Ca, Mg, Fe)2Si2O6)

Green Fluorite

Calcium Fluoride (CaF2)

Jadeite (Jade)

NaAlSi2O6 (Sodium Aluminum Silicate)

Basalt (Greenstone)

Amygdaloidal Basalt / Chloritized Basalt

Clear Quartz (Rock Crystal)

Quartz (Silicon Dioxide, SiO2)

Lepidolite

Lepidolite (K(Li,Al)3(Al,Si,Rb)4O10(F,OH)2)

Marble

Recrystallized Calcite (CaCO3)

Tiger Iron

Tiger Iron (A complex combination of Hematite Fe2O3, Red Jasper SiO2, and Tiger's Eye SiO2/FeOOH)

Tiger's Eye and Carnelian Quartz

Silicon Dioxide (SiO2)

Sandstone or Quartzite

Arenite (if sedimentary) / Quartzite (if metamorphic)

Ocean Jasper (Orbicular Jasper)

Silicon Dioxide (SiO2) with inclusions

Anthracite Coal

Coal (predominantly carbon)