Mineral (Man Made Glass, Not Natural)

Chert / Flint

Microcrystalline Quartz (SiO2)

Quartz Pebble (Beach Chalcedony)

Silicon Dioxide (SiO2)

Chert (Chalcedony/Agate)

Microcrystalline Quartz (SiO2)

Pink Granite

Phaneritic Felsic Igneous Rock (composed of orthoclase, quartz, and plagioclase)

Turquoise-colored ring stone (possibly turquoise or imitation)

Turquoise, CuAl₆(PO₄)₄(OH)₈·4H₂O; identity cannot be confirmed from the image

Tumbled blue glassy mineral, possibly sodalite or blue aventurine

Identification uncertain; likely sodalite (Na₈Al₆Si₆O₂₄Cl₂) or blue-dyed quartz/slag-like material

Granite

Granite (a common rock type, not a single mineral with a formula. Composed primarily of quartz, feldspar, and mica/amphibole).

Smoky Quartz (Faceted)

Silicon Dioxide (SiO2)

Chalk

Calcium Carbonate (CaCO3)

Tumbled brown chalcedony or jasper

Microcrystalline quartz, SiO₂; possibly iron-bearing jasper

Fossilized Bored Limestone

Limestone with Ichnofossils (Gastrochaenolites or Entobia)

Apache Tear

Obsidian (Natural volcanic glass)

Tumbled chalcedony or quartz pebble

Microcrystalline quartz, SiO₂ (likely chalcedony); exact identification is uncertain from the image

Colorless faceted gemstone, likely glass or quartz

Uncertain; possibly quartz (SiO₂), but the strong uniform brilliance and apparent molded/faceted form may indicate leaded glass or cubic zirconia

Quartz (likely Chalcedony or Chert)

Silicon Dioxide (SiO2)

Green glassy slag or manufactured glass bead

Noncrystalline silicate glass; likely industrial glass/slag, not a true mineral

Citrine

Silicon Dioxide (SiO2)

Granite

Felsic intrusive igneous rock

Tektite (Indochinite)

Tektite (Natural silica glass)

Mixed Gemstone Beaded Jewelry

Various minerals (e.g., Quartz varieties like Rose Quartz, Amethyst; Peridot; Garnet; etc.)

Quartz (Iron-stained)

Silicon Dioxide (SiO2)

Greenstone / serpentinite carving

Serpentinite, chiefly serpentine-group minerals (antigorite, lizardite, or chrysotile); exact identification requires testing

Green aventurine pebble

Quartz (SiO₂) with fuchsite mica inclusions

Citrine Quartz

Silicon Dioxide (SiO2) with iron impurities

Citrine or Yellow Quartz

Silicon Dioxide (SiO2) with iron impurities

Diamond (Faceted)

Carbon (C)

Ruby (set in a ring; possibly synthetic or imitation)

Corundum, Al₂O₃; red color is typically caused by chromium

Sandstone (Ferruginous)

Arenite (SiO2 with Fe2O3 cement)

Snowflake Obsidian

Volcanic Glass with Cristobalite inclusions (SiO2)

Obsidian

Obsidian (Volcanic Glass)

Yellow Quartz / Citrine Quartz

Silicon Dioxide (SiO2)

Aragonite

Aragonite (Calcium Carbonate - CaCO3)

Black-and-white agate or onyx bead necklace

Variegated chalcedony (microcrystalline SiO₂), possibly black-and-white banded agate; some black beads may be dyed chalcedony or hematite

Blue quartz (likely dyed or synthetic-treated quartz beads)

Quartz, silicon dioxide (SiO₂)

Cat's Eye Moonstone (Simulated/Synthetic or natural Cat's Eye Quartz/Glass)

There is no single scientific name. The appearance suggests either: Moonstone (feldspar group), Cat's Eye Quartz (SiO2), Apatite (Ca5(PO4)3(F,Cl,OH)), or most likely a synthetic material such as Fiber Optic Glass or 'Opalite' (a type of glass).

Moldavite

Tektite (Natural Silica Glass)

Botryoidal chalcedony with iron-oxide staining

Microcrystalline quartz (SiO₂), likely iron-oxide-bearing chalcedony

Polished black stone pendant

Likely black obsidian or black tourmaline; exact identification is uncertain from the photograph

Likely tumbled yellow-orange mineral or glassy stone

Indeterminate from photograph; possibilities include yellow jasper, calcite, agate, or dyed quartz

Sandstone

Arenite

Chalcedony (Agate / Jasper Specimen)

Silicon Dioxide (SiO2)

Citrine Quartz

Silicon Dioxide (SiO2) with iron impurities