Metamorphic Or Igneous With Mineral Inclusion

Glacial Cobble with Granite Inclusion

Porphyritic Basalt or Andesite containing Granitic Xenolith

Tumbled milky quartz

Quartz (silicon dioxide, SiO₂), commonly called white or milky quartz

Quartz-bearing rock fragment

Likely quartz (SiO₂) with iron-oxide staining and possible feldspar/matrix minerals

Dark gray crystalline rock, possibly basalt

Basalt (tentative; plagioclase–pyroxene–iron oxide assemblage)

Tumbled milky quartz

Quartz (silicon dioxide, SiO₂)

Red glass-like crystal, likely synthetic ruby or red glass

Uncertain from image; possible corundum (ruby), Al₂O₃, or synthetic glass

Smoky Quartz with possible inclusion

Silicon Dioxide (SiO2)

Cut red gemstone, likely ruby

Ruby, gem-quality corundum (Al₂O₃) colored by chromium

Pebble with dark mineral inclusion

Likely granitic or gneissic quartz–feldspar pebble with a mafic inclusion; exact identification requires testing

Blue Sapphire

Corundum (Al2O3 - Aluminum Oxide)

Tumbled milky quartz

Quartz (silicon dioxide, SiO₂)

Rutilated quartz crystal

Quartz, silicon dioxide (SiO₂), containing rutile inclusions (TiO₂)

Tumbled milky quartz

Quartz (silicon dioxide, SiO₂)

Tumbled milky quartz (likely quartz with a dark mineral inclusion)

Quartz, silicon dioxide (SiO₂), with an unidentified dark inclusion

Quartz-rich feldspathic pebble, possibly granite or granitic gneiss

Quartz–feldspar aggregate, likely granite; dark inclusion may be biotite, hornblende, or iron-oxide staining

Quartz Pebble with Hematite Inclusion

Silicon Dioxide (SiO2)

Strawberry Quartz (Lepidocrosite/Hematite-Included Quartz)

Quartz (Silicon Dioxide) with Lepidocrosite or Hematite inclusions (SiO2 + Fe2O3 · nH2O)

Blue Sapphire (Synthetic or Man-made Glass Imitation)

Corundum (Al2O3) if natural; Lead-glass or Spinal if synthetic

Quartz Pebble (Iron-Stained Quartz)

Silicon Dioxide (SiO2) with Hematite/Limonite inclusion

Tumbled milky quartz (likely quartzite or chalcedony-rich stone)

Quartz, SiO₂

Tumbled milky quartz, possibly quartzite

Quartz (SiO₂); the specimen may be a quartz-rich metamorphic rock if its texture is granular

Epidote-bearing Rock / Epidote Inclusion

Epidote (Ca2(Al, Fe)3(SiO4)3(OH)) in host rock

Sapphire

Corundum (Al2O3)

Blue Calcite

Calcium Carbonate (CaCO3)

Tumbled milky quartz pebble

Quartz (silicon dioxide, SiO₂)

Greenstone

Greenschist (primarily composed of chlorite, actinolite, and epidote)

Tumbled milky quartz (likely quartz pebble)

Quartz, silicon dioxide (SiO₂)

Red Quartz

Silicon Dioxide (SiO2) with Hematite inclusions

Green Aventurine

Silicon Dioxide (SiO2) with Fuchsite inclusions

Dumortierite Quartz

Dumortierite in Quartz (SiO2 with Al7BO3(SiO4)3(O,OH)3)

Tumbled quartz pebble

Quartz (silicon dioxide, SiO₂)

Milky quartz pebble

Quartz (silicon dioxide, SiO₂)

Quartz Pebble

Silicon Dioxide (SiO2)

Polished smoky quartz (likely iron-stained quartz)

Quartz, silicon dioxide (SiO₂); brown coloration may result from irradiation or iron-related staining/inclusions

Blue Quartz (Blue Aventurine)

Silicon Dioxide with inclusions (SiO2)

Milky quartz fragment

Quartz (silicon dioxide, SiO₂)

Xenolith in Basalt

Mafic Igneous Rock with Felsic Inclusion

Clear quartz tumbled stone

Quartz (silicon dioxide, SiO₂)

Polished white/gray stone, possibly quartz or marble

Indeterminate; likely quartz (SiO₂) or calcite-rich marble (CaCO₃)

Milky quartz (possibly chalcedony)

Quartz, SiO₂; likely massive or cryptocrystalline quartz

Rounded pebble with dark mineral inclusion

Likely granitic or volcanic pebble containing a mafic inclusion; exact identification requires testing

Tumbled quartz-rich pebble, likely milky quartz with iron-oxide staining

Quartz (SiO₂), possibly with hematite/goethite inclusions or surface coating