Igneous Or Metamorphic

Tumbled orbicular granite or granitic gneiss

Granite, chiefly quartz–feldspar–biotite/amphibole; exact variety uncertain from the image

Magnetite / Iron Ore

Magnetite (Fe3O4)

Gneiss (specifically a Hornblende Gneiss or Micaceous Gneiss)

Gneiss (metamorphic rock composed primarily of quartz, feldspar, and mafic minerals)

Greenschist

Greenschist (composed mainly of chlorite, epidote, actinolite, and albite)

Gneiss (Stream-worn Cobble)

Gneiss (Metamorphic rock composed primarily of Quartz, Feldspar, and Mica)

Gneis

Gneiss (High-grade metamorphic rock)

Gneiss

Gneiss (High-grade metamorphic rock)

Banded Gneiss

Gneiss (High-grade Metamorphic Rock)

Banded Gneiss

Gneiss (High-grade regional metamorphic rock)

Gneiss

Gneiss (High-grade regional metamorphic rock)

Polished pink-and-black granite or gneiss

Granite–gneiss, chiefly quartz, feldspar, and biotite/amphibole

Schist

Mica Schist (formula variable based on mineral content, typically containing [K,Al,Fe,Mg,Si,O,H])

Epidote in Quartz

Epidote (Ca2(Al,Fe)3(SiO4)3(OH)) in Milky Quartz (SiO2)

Greenschist / Greenstone

Greenschist (composed of chlorite, epidote, actinolite, albite)

Gneiss

Gneiss

Ruby

Corundum (Al2O3:Cr)

Corundum (Ruby variety)

Aluminium oxide (Al2O3)

Magnetite or Magnetic Iron Ore

Magnetite (Fe3O4)

Polished green stone, likely serpentine or altered basalt

Serpentine-group minerals, chiefly Mg₃Si₂O₅(OH)₄; exact identification requires testing

Weathered volcanic rock, likely vesicular basalt or scoria

Basaltic volcanic rock; predominantly plagioclase, pyroxene, and possibly olivine with iron-oxide weathering

Quartz-rich breccia or vein quartz with dark inclusions

Milky quartz (SiO₂), likely brecciated and cemented with iron oxides and dark mica/amphibole minerals

Greenschist (Chlorite Schist)

Greenschist (Metamorphic rock dominated by chlorite, actinolite, and epidote)

Serpentinite

Serpentinite (Hydrated magnesium iron silicate)

Gneiss

Gneiss (High-grade regional metamorphic rock)

Gneissic Schist

Foliated Metamorphic Rock (Schist/Gneiss transition)

Banded Gneiss

Gneiss (High-grade regional metamorphic rock)

Greenstone

Metamorphic mafic rock (greenschist facies)

Feldspathic Gneiss

High-grade Metamorphic Rock (Gneiss)

Gneiss

High-grade metamorphic rock (Gneiss)

Banded Gneiss

Gneiss (High-grade Metamorphic Rock)

Tumbled white quartz pebble

Quartz (silicon dioxide, SiO₂), possibly milky quartz

Tumbled quartz pebble (likely milky quartz)

Quartz, silicon dioxide (SiO₂)

Tumbled quartz pebble

Quartz (silicon dioxide, SiO₂), likely milky or smoky quartz

Pink/red faceted gemstone, likely synthetic ruby or pink sapphire

Corundum, aluminum oxide (Al₂O₃); likely lab-grown or treated material

Sunstone

Feldspar (Oligoclase)

White Quartz

Quartz (Silicon Dioxide, SiO2)

Quartz

Silicon Dioxide (SiO2)

Quartz pebble

Silicon dioxide (SiO2)

Milky Quartz

Silicon Dioxide (SiO2)

Quartz

Silicon Dioxide (SiO2)

Quartz Pebble

Silicon Dioxide (SiO2)

Quartz (Yellow / Citrine Quartz Pebble)

Silicon Dioxide (SiO2)