Metamorphic (Altered Igneous Rock)

Small polished or naturally worn stone, possibly quartz-bearing rock

Indeterminate from the blurred image; likely quartz (SiO₂) or a pale feldspar-rich fragment

Agate

Chalcedony (SiO2)

Citrine Quartz

Quartz (SiO2) - specifically, a variety of macrocrystalline quartz

Gneiss

Gneiss (High-grade metamorphic rock)

Blue Apatite

Calcium phosphate mineral, Ca5(PO4)3(F,Cl,OH)

Labradorite (a variety of Feldspar)

Labradorite; (Na,Ca)(Al,Si)4O8 (a plagioclase feldspar)

Small quartz-rich pebble or rock fragment

Quartz (silicon dioxide, SiO₂), possibly with iron-oxide staining or host-rock inclusions

Muscovite mica

Muscovite, KAl₂(AlSi₃O₁₀)(OH)₂

Black Tourmaline

Schorl (Na(Fe²⁺)₃Al₆(BO₃)₃Si₆O₁₈(OH)₄)

Quartz

Silicon Dioxide (SiO2)

Quartz

Silicon Dioxide (SiO2)

Quartz (Milky/Clear variety)

Silicon Dioxide (SiO2)

Turquoise

Turquoise - CuAl6(PO4)4(OH)8·4H2O

Gneiss (Pebble)

Gneiss

Azurite and Malachite on Matrix

Azurite: Cu3(CO3)2(OH)2; Malachite: Cu2CO3(OH)2

Serpentine

Antigorite, Lizardite, or Chrysotile (Mg, Fe)3Si2O5(OH)4

Banded Gneiss

Gneiss (Metamorphic Rock)

Magnetite (Lodestone)

Iron(II,III) oxide (Fe3O4)

Quartz

Silicon Dioxide (SiO2)

Quartz

Silicon Dioxide (SiO2)

Agate

Silicon Dioxide (Chalcedony), SiO2

Schist

Schist

Quartz (Milky / Clear Quartz Fragment)

Silicon Dioxide (SiO2)

Granodiorite (Gneissic texture)

Granodiorite (containing Quartz SiO2, Plagioclase Feldspar, and Biotite)

Mixed polished rock/mineral specimens

Indeterminate from image; likely quartz-bearing material with iron-oxide staining and possibly mica-rich schist

Quartz Pebble

Silicon Dioxide (SiO2)

Milky Quartz

Silicon Dioxide (SiO2)

Quartz with Iron Oxide Inclusions

Silicon Dioxide (SiO2)

Turquoise

Hydrated phosphate of copper and aluminium (CuAl6(PO4)4(OH)8·4H2O)

Tumbled White Quartz

Silicon Dioxide (SiO2)

Quartz (Milky Quartz/Citrine Type)

Silicon Dioxide (SiO2)

Banded Gneiss

Gneiss (High-grade regional metamorphic rock)

Likely polished basalt or iron-rich metamorphic rock

Basaltic rock, chiefly plagioclase and pyroxene; exact identification requires testing

Serpentine

Serpentine group (Mg,Fe,Ni,Al,Zn,Mn)3(Si,Fe,Al)2O5(OH)4

Quartz Pebble

Silicon Dioxide (SiO2)

Magnetite / Iron-Rich Basalt

Magnetite bearing Mafic Rock (Fe3O4)

Gneiss

Gneiss (High-grade metamorphic rock)

Milky Quartz

Quartz (Silicon Dioxide, SiO2)

Unakite

Altered Granite (Epidote, Pink Orthoclase Feldspar, and Quartz)

Ruby in Zoisite (Anyolite) or possibly a dyed stone/agate

Anyolite (Ruby in green zoisite) or artificially altered chalcedony

Fossilized bone, likely a large mammal limb bone

Mineralized cortical bone; exact taxon indeterminate from the image

Tumbled Clear Quartz

Silicon Dioxide (SiO2)