Metamorphic (Man Made)

Porphyritic Basalt or Diabase with Plagioclase Phenocrysts

Porphyritic Basalt or Diabase; Mineral: Plagioclase Feldspar

Quartzite with Quartz Vein

Quartzite (primarily SiO2)

Rhodonite

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

Graphite

Graphite (Carbon, C)

Rhodonite

Rhodonite (Manganese Iron Magnesium Calcium Silicate - (Mn,Fe,Mg,Ca)SiO3)

Amethyst (Chevron or Banded Amethyst)

Silicon Dioxide (SiO2) with trace Iron (Fe)

Quartzite

Quartzite (primarily SiO2)

Quartz Pebble (often referred to as 'Sea Glass' or 'River Stone' when worn smooth)

Silicon Dioxide (SiO2)

Quartz (Pale Rose or Milky Variety)

Silicon Dioxide (SiO2)

Orthoclase Feldspar

KAlSi3O8 (Potassium Aluminum Silicate)

Sodalite

Sodalite (Na8(Al6Si6O24)Cl2)

Chert / Greenstone

Silicon Dioxide (SiO2) with impurities

Rhodonite

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

Pink Thulite (in Pumice-like texture)

Pink Zoisite (Mn-bearing Zoisite), Ca2Al3(SiO4)3(OH)

Rhodonite

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

Rhodonite

Rhodonite (Mn2+SiO3)

Rhodonite

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

Rhodonite

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

Orthoclase Feldspar with Quartz

Orthoclase (KAlSi3O8)

Quartz

Silicon Dioxide (SiO2)

Rhodonite

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

Greasy Quartz (likely carved Milky Quartz or Aventurine)

Silicon Dioxide (SiO2)

Quartzite Pebble

Metamorphic Quartz (SiO2)

Milky Quartz

Silicon Dioxide (SiO2)

Rhodochrosite

Manganese carbonate (MnCO3)

Serpentinite

Serpentinite (composed primarily of Serpentine group minerals: (Mg,Fe)3Si2O5(OH)4)

Quartzite River Rock

Quartzite (primarily SiO2)

Quartz Crystal

Silicon Dioxide (SiO2)

Clear Quartz

Silicon Dioxide (SiO2)

Hematite Nodule

Hematite (Fe2O3)

Milky Quartz

Silicon Dioxide (SiO2)

Graphite

Graphite (C)

Clear Quartz (Rock Crystal)

Silicon Dioxide (SiO2)

Potassium Feldspar (Orthoclase)

KAlSi3O8

Rhodonite

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

Rhodonite

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

Milky Quartz

Quartz (Silicon Dioxide, SiO2)

Turquoise

Turquoise (Hydrated copper aluminum phosphate, CuAl6(PO4)4(OH)8·4H2O)

Milky Quartz with Iron Inclusions

Silicon Dioxide (SiO2)

Quartzite

Quartzite (SiO2)

Quartz

Silicon Dioxide (SiO2)

Quartzite Pebble

Metamorphic Quartzite (SiO2)