Man Made Metamorphic Style Composite

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)

Andesite Porphyry

Andesite (extrusive volcanic rock)

Granite Cobble

Granite (Phaneritic Quartz-Feldspar specimen)

Sandstone

Arenite (primarily SiO2)

Quartz Crystal

Silicon Dioxide (SiO2)

Clear Quartz

Silicon Dioxide (SiO2)

Hematite Nodule

Hematite (Fe2O3)

Milky Quartz

Silicon Dioxide (SiO2)

Basalt

Basalt (Aphanitic Mafic Igneous Rock)

Sandstone

Arenite (SiO2 + various cementing minerals)

Granite

Phaneritic Igneous Rock (composed of quartz, alkali feldspar, and plagioclase)

Granite

Phaneritic Igneous Rock (composed primarily of Quartz SiO2, Alkali Feldspar, and Plagioclase)

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)

Goldstone

Not a natural mineral or rock. It is an ornamental glass.

Rhodonite

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

Rhodonite

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

Clear Quartz

Silicon dioxide (SiO2)

Clear Quartz (Rock Crystal)

Silicon Dioxide (SiO2)

Potassium Feldspar (Orthoclase)

Orthoclase (KAlSi3O8)

Magnetite / Iron Ore

Magnetite (Fe3O4)

Hematite

Iron(III) oxide (Fe2O3)

Potassium Feldspar

Orthoclase (KAlSi3O8)

Pyrite in Matrix (Fool's Gold)

Iron Disulfide (FeS2)

Milky Quartz

Silicon Dioxide (SiO2)

Biotite Mica

K(Mg, Fe)3AlSi3O10(F, OH)2