Metamorphic (Modified)

Quartzite River Rock

Quartzite (primarily SiO2)

Greenstone (metamorphosed basalt)

Greenschist / Meta-basalt

Marble

Recrystallized Carbonate Rock (CaCO3)

Schist

Mica Schist

Mica Schist

Mica Schist (primarily Muscovite or Biotite sheet silicates)

White Marble

Recrystallized Calcite (CaCO3)

Red Quartzite

Quartzite (SiO2)

Milky Quartz

Silicon Dioxide (SiO2)

Milky Quartz

Silicon Dioxide (SiO2)

Garnet

Almandine (Fe3Al2(SiO4)3)

Unakite

Unakite (Epidotized Granite)

Gray Slate River Stone

Slate

Milky Quartz

Silicon Dioxide (SiO2)

Quartzite

Quartzite (mostly SiO2)

Fuchsite

Cr-bearing Muscovite (K(Al,Cr)2(AlSi3O10)(OH)2)

Quartzite Cobble

Quartzite (predominantly SiO2)

Milky Quartz

Silicon Dioxide (SiO2)

Quartz (Iron-stained)

Silicon Dioxide (SiO2)

White Quartz (Milky Quartz)

Quartz (Silicon Dioxide - SiO2)

Biotite (Black Mica)

Biotite - K(Mg,Fe)3(AlSi3O10)(OH)2

Greenschist / Chloritaform Schist

Chlorite Schist (Group of Silicate Minerals)

Quartzite

Quartzite (primarily SiO2)

Quartzite pebble

Quartzite (SiO2)

Epidote in Matrix (Unakite-related)

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

Milky Quartz with Iron Staining

Silicon Dioxide (SiO2)

Quartz Vein in Host Rock

Quartz (SiO2) in Mafic or Sedimentary Matrix

Yellow Quartz (Citrine/Yellow Jasper mix)

Silicon Dioxide (SiO2)

River Quartzite (or Quartz Cobble)

Quartzite (primarily Silicon Dioxide - SiO2)

Fuchsite Gneiss (Green Quartzite)

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

Schist (Micaceous Schist)

Schist (containing mainly Muscovite and Quartz)

Marble

Metamorphic rock composed of Recrystallized Carbonate Minerals (chiefly CaCO3)

Milky Quartz

Silicon Dioxide (SiO2)

Pink Quartz (Rose Quartz variant)

Silicon Dioxide (SiO2)

Quartzite Cobble

Quartzite (primarily SiO2)

Milky Quartz

Silicon Dioxide (SiO2)

Milky Quartz

Quartz (Silicon Dioxide, SiO2)

Quartzite

Quartzite (SiO2)

Gossan (Iron Hat)

Limonitic Gossan (Fe-oxide/hydroxide complex)

Quartzite

Quartzite (SiO2)

Quartzite

Quartzite (SiO2)

Rhodonite

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

Slate

Foliated Metamorphic Rock (primarily composed of Muscovite, Chlorite, and Quartz)