Metamorphic And Igneous

Quartzite Pebble

SiO2 (Silicon Dioxide)

Rhodonite

Manganese Silicate (Mn,Fe,Mg,Ca)SiO3

Anthracite Coal

Anthracite (Carbon Content: 86%-97%)

Schist

Mica Schist (Medium-grade Metamorphic Rock)

Tiger's Iron

Pseudomorphic Quartz Aggregate (contains SiO2 with Fe2O3 and FeOOH)

Tiger's Eye

Pseudomorph of quartz after crocidolite (SiO2 with iron oxide inclusions)

Quartzite with Chlorite

Metamosphosed Quartz Sandstone (SiO2 with (Mg,Fe)3(Si,Al)4O10(OH)2 inclusions)

Schist

Mica Schist

Schist

Schist (various mineral compositions)

Seraphinite

Clinochlore (a variety of the chlorite group)

Unakite

Epidotized Granite

Unakite

Epidotized Granite

Almandine Garnet in Matrix

Almandine Garnet (Fe3Al2(SiO4)3) in Schist/Quartz Matrix

Quartzite with Chlorite/Epidote

Metamorphosed Quartzite (SiO2)

Specular Hematite (Specularite)

Iron(III) oxide (Fe2O3)

Fuchsite

K(Al,Cr)2(AlSi3O10)(OH)2 (Chromium-rich Muscovite)

Rhodonite

Manganese Inosilicate (Mn,Fe,Mg,Ca)SiO3

Kyanite

Kyanite (Al2SiO5)

Rhodonite

Rhodonite (Manganese silicate), (Mn,Fe,Mg,Ca)SiO3

Zoisite with Ruby

Anyolite (Ca2Al3(SiO4)3(OH) with Al2O3:Cr)

Nephrite Jade

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

Prasiolite and Quartz Crystal Cluster

Quartz (SiO2); Prasiolite is a variety of Quartz

Unakite (Epidotized Granite)

Unakite; primarily composed of Epidote (Ca2(Al,Fe)3(SiO4)3(OH)), Orthoclase (KAlSi3O8), and Quartz (SiO2)

Schist

Mica Schist (predominantly Muscovite or Biotite)

Anthracite Coal

Anthracite (Carbon-rich metamorphic coal)

Greenschist / Migmatite

Regional Metamorphic Complex (Facies: Greenschist to Amphibolite)

Quartzite (River-worn Shiner)

Quartzite (Formula: SiO2)

Greenschist

Chlorite schist

Quartz

Silicon Dioxide (SiO₂)

Schist/Phyllite

Metamorphic Schist (Chlorite Schist variety)

Cream Marble (Speckled)

Metamorphosed Limestone (mainly CaCO3)

Quartzite

Quartzite (primarily SiO2)

Quartzite pebble

Quartzite (SiO2)

Epidote in Matrix (Unakite-related)

Epidosite (Ca2(Al,Fe)3(SiO4)3(OH))

Schist (Micaceous Schist)

Schist (containing mainly Muscovite and Quartz)

Marble

Metamorphic rock composed of Recrystallized Carbonate Minerals (chiefly CaCO3)

Fuchsite Gneiss (Green Quartzite)

Chromium-rich Muscovite (KAl2(AlSi3O10)(OH)2 with Cr replacements)

River Quartzite (or Quartz Cobble)

Quartzite (primarily Silicon Dioxide - SiO2)

Quartzite

Quartzite (SiO2)

Milky Quartz

Silicon Dioxide (SiO2)

Quartzite Cobble

Quartzite (primarily SiO2)

Quartzite

Quartzite (SiO2)