Man Made Material, Not A Natural Rock Or Mineral Specimen

Diamond

Carbon (C)

Tumbled blue quartz (likely dyed quartzite or blue aventurine)

Quartz, silicon dioxide (SiO₂); blue coloration may result from inclusions or dye

Sandstone (Red/Brown Variety)

Arenite (composed primarily of SiO2 with Fe2O3 iron oxide inclusions)

Polished smoky quartz crystal point

Quartz (SiO₂), likely iron-colored or smoky quartz with milky inclusions

Sandstone (Ferruginous)

Arenite with Iron-Oxide Cement

Turquoise ring

Turquoise, CuAl₆(PO₄)₄(OH)₈·4H₂O; the setting appears to be silver-colored metal

Sandstone

Arenite (SiO2 variety)

Tumbled green glassy mineral, possibly aventurine or fluorite

Uncertain; likely quartz variety (aventurine quartz, SiO₂) or green fluorite (CaF₂)

Dyed turquoise-colored lava stone beads

Vesicular basalt (scoria), commonly sold as dyed lava rock

Possible basalt or industrial iron-rich slag

Basalt (plagioclase–pyroxene rock); identification uncertain from image

Dark gneiss or migmatitic amphibolite

Band ed gneiss; composition likely quartz–feldspar–biotite/amphibole, possibly migmatite

Limestone

Calcareous sedimentary rock (CaCO3)

Chert Nodule

Microcrystalline Quartz (SiO2)

Blue slag-like mineral specimen, possibly bornite or chalcopyrite

Tentatively bornite (Cu5FeS4) or iridescent chalcopyrite (CuFeS2)

Diamond (faceted)

Diamond (Pure Carbon, C)

Sandstone (River Cobble)

Clastic sedimentary rock (primarily SiO2)

Likely weathered metallic mineral or slag fragment

Indeterminate; possibly iron-rich sulfide/oxide material or industrial slag

Pale blue-gray quartz-rich pebble (tentative)

Quartz, SiO₂, possibly chalcedony or a weathered metamorphic fragment

Iron-rich stone, likely limonite/goethite-bearing rock

Limonite (hydrated iron oxides; chiefly goethite, FeO(OH), with possible hematite)

Weathered, iron-stained rock (likely metamorphic)

Indeterminate from photograph; possibly quartz-rich gneiss or schist

Green glassy gemstone-like specimen

Likely synthetic glass or treated quartz; exact identification requires testing

Speckled rounded stone, likely granite or granitic gneiss

Granite/granitic gneiss; primarily quartz (SiO₂), feldspar, and dark mica or amphibole

Sandstone (likely Arkosic or Lithic)

Clastic Sedimentary Rock (SiO2 with accessory minerals)

Polished opal-bearing rock (likely boulder opal)

Opal, hydrated amorphous silica (SiO₂·nH₂O), in ironstone or host rock

Rounded stream cobble

Lithology indeterminate; likely weathered sandstone, quartzite, or granitic rock

Milky quartz (rough quartz fragment)

Quartz, silicon dioxide (SiO₂)

Polished white chalcedony or milky quartz pebble

Chalcedony, microcrystalline quartz (SiO₂), possibly with iron-oxide staining or a minor mineral inclusion

Polished rutilated quartz cabochon

Quartz (SiO₂) with rutile inclusions (TiO₂)

Yellow faceted gemstone, likely citrine or yellow sapphire

Uncertain; probable quartz (SiO₂) or corundum (Al₂O₃)

Weathered quartz-bearing rock

Quartz-rich vein material; likely quartz with iron oxides and feldspar, exact rock type uncertain

Diamond

Carbon (C)

Pink Granite

Phaneritic Felsic Igneous Rock (Granite)

Yellow Sapphire (Raw)

Corundum (Al2O3)

Polished agate geode slice

Banded chalcedony (microcrystalline SiO₂), with druzy quartz and possible iron-oxide inclusions

Sandstone (Iron-stained)

Clastic sedimentary rock (SiO2 with Fe2O3 staining)

Diamond

Carbon (C)

Goldstone

Not a natural mineral or rock. It is an ornamental glass.

Tumbled amethyst

Amethyst, purple variety of quartz (SiO₂)

Clear quartz crystal (likely)

Quartz, silicon dioxide (SiO₂)

Amethyst cluster

Amethyst, purple quartz (SiO₂)

Granite

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

Mixed polished gemstone and mineral collection

Primarily quartz varieties (SiO₂), plus probable aventurine, rose quartz, amethyst, agate, jasper, serpentine, feldspar, and possibly dyed or man-made glass pieces