This Appears To Be A Man Made Metallic Object, Likely Jewelry, Not A Natural Rock, Mineral, Or Geological Specimen.

Gneiss (Metamorphic Cobble)

Gneiss (High-grade Regional Metamorphic Rock)

Quartz (likely Milky Quartz or Chalcedony)

Quartz (SiO2 - Silicon Dioxide)

Banded Agate (specifically Botswana Agate or Water-line Agate)

Chalcedony (cryptocrystalline variety of Quartz), SiO2

Gold

Native Gold (Au)

Banded Agate

Cryptocrystalline Quartz (SiO2)

Opal

Hydrous silicon dioxide (SiO2·nH2O)

White Quartz (Milky Quartz)

Silicon Dioxide (SiO2)

Pyrite

Iron Sulfide (FeS2)

Jade

There are two distinct minerals commonly known as Jade: Jadeite (NaAlSi2O6) and Nephrite (Ca2(Mg,Fe)5Si8O22(OH)2). Based on the appearance, these spheres are likely Nephrite.

Goethite

Goethite (α-FeO(OH))

Turquoise

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

Amazonite

K(AlSi3O8) - Lead-bearing Microcline (Potassium Feldspar)

Quartz (Fieldstone/Pebble)

Silicon Dioxide (SiO2)

Azurite with Malachite and Limonite

Azurite Cu3(CO3)2(OH)2 / Malachite Cu2CO3(OH)2

Amethyst

Silicon Dioxide (SiO2) with iron impurities

Limonite and Goethite (Ironstone)

Hydrous Iron Oxide Mixture (FeO(OH)·nH2O)

Quartz Crystal Cluster

Quartz (Silicon Dioxide, SiO2)

Obsidian

Obsidian (Volcanic Glass)

Quartz

Quartz (SiO₂)

Pink Stained Rock (Likely Quartzite or Sandstone with Iron Oxide Staining)

Quartzite (metamorphic) or Sandstone (sedimentary); coloration likely due to hematite or other iron oxides.

Green Chalcedony (likely Chrysoprase or dyed Green Agate)

Silicon Dioxide (SiO2) with nickel impurities or chromium/dye

Smoky Quartz

Silicon Dioxide (SiO2)

Hematite

Iron(III) oxide (Fe2O3)

Granite Cobble

Phaneritic Felsic Igneous Rock

Pyrite (Fool's Gold)

Iron Disulfide (FeS2)

Halite (Rock Salt)

Halite; NaCl (Sodium Chloride)

Amethyst

Amethyst (SiO2)

Pink Dyed Agate

Chalcedony (SiO2) with artificial dyes

Pyrite in Shale

Iron Sulfide (FeS2) in Sedimentary Matrix

Coal (most likely Bituminous or Anthracite)

Bituminous Coal (Grade of Coal), Anthracite (Grade of Coal)

Jasper and Agate

Microcrystalline Quartz (SiO2)

Citrine

Quartz (SiO₂)

Grey Quartz (likely Smoky Quartz or Milky Quartz)

Silicon Dioxide (SiO2)

Amethyst Quartz

Silicon Dioxide (SiO2) with iron impurities

Pumice (likely)

Pumice (extrusive igneous rock)

Pyrite

Iron Disulfide (FeS2)

Pink Granite

Phaneritic Felsic Igneous Rock (Granite)

Pyrite Geode (Sparkling Druzy)

Iron Sulfide (FeS2) in Sedimentary Nodule

Nephrite Jade

Nephrite (a variety of the mineral actinolite within the amphibole group); Chemical Formula: Ca2(Mg,Fe)5Si8O22(OH)2

Smoky Quartz occurring with Feldspar

Silicon Dioxide (SiO2) with Potassium Aluminum Silicate (KAlSi3O8)

Sunstone

Plagioclase Feldspar (specifically Oligoclase variety containing hematite or goethite inclusions)", composition: (Ca,Na)(Al,Si)2Si2O8

Green Sea Glass

Amorphous Silica (man-made glass), SiO2 + additive metal oxides