Man Made Material, Not A Natural Rock Or Mineral Specimen

Diamond

Diamond (pure Carbon, C)

Gemstone ring (stone not identifiable)

Unknown; the small central stone may be a colorless gemstone or glass, and the surrounding metal is gold-colored alloy

Dyed turquoise-colored lava stone beads

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

Limestone

Calcareous sedimentary rock (CaCO3)

Sandstone (specifically Banded Sandstone)

Clastic sedimentary rock (primarily SiO2)

Likely weathered quartz-rich rock fragment

Indeterminate; possibly quartz-bearing sandstone or chert with iron-oxide staining

Weathered granite or granitic gneiss block

Granite, chiefly quartz, feldspar, and mica; possibly gneiss if the visible banding is structural

Tumbled blue quartz (likely dyed quartzite or blue aventurine)

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

Amethyst

Quartz (SiO₂), purple variety; trigonal crystal system

Green stone disk, possibly serpentine or jade

Indeterminate from the photograph; candidates include serpentine-group minerals (approximately Mg₃Si₂O₅(OH)₄) or jadeite jade (NaAlSi₂O₆).

Turquoise ring

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

Tumbled iron-rich stone, likely hematite-bearing jasper

Jasper (microcrystalline quartz, SiO₂) with iron oxides, chiefly hematite/goethite

Sandstone (Red/Brown Variety)

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

Sandstone

Arenite (SiO2 variety)

Polished smoky quartz crystal point

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

Sandstone (Ferruginous)

Arenite with Iron-Oxide Cement

Sandstone (River Cobble)

Clastic sedimentary rock (primarily SiO2)

Chert Nodule

Microcrystalline Quartz (SiO2)

Blue slag-like mineral specimen, possibly bornite or chalcopyrite

Tentatively bornite (Cu5FeS4) or iridescent chalcopyrite (CuFeS2)

Weathered, iron-stained rock (likely metamorphic)

Indeterminate from photograph; possibly quartz-rich gneiss or schist

Yellow faceted gemstone, likely citrine or yellow sapphire

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

Polished rutilated quartz cabochon

Quartz (SiO₂) with rutile inclusions (TiO₂)

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

Sandstone (likely Arkosic or Lithic)

Clastic Sedimentary Rock (SiO2 with accessory minerals)

Possible basalt or industrial iron-rich slag

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

Tumbled green glassy mineral, possibly aventurine or fluorite

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

Dark gneiss or migmatitic amphibolite

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

Pale blue-gray quartz-rich pebble (tentative)

Quartz, SiO₂, possibly chalcedony or a weathered metamorphic fragment

Polished opal-bearing rock (likely boulder opal)

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

Diamond (faceted)

Diamond (Pure Carbon, C)

Quartz

Silicon dioxide (SiO₂)

Green glassy gemstone-like specimen

Likely synthetic glass or treated quartz; exact identification requires testing

Blue Goldstone

Synthetic glass with copper or cobalt/manganese inclusions

Small dark mineral or rock fragment (not identifiable from the image)

Undetermined; the specimen is too small and lacks visible diagnostic features for a reliable identification.

Likely weathered metallic mineral or slag fragment

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

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

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

Goldstone

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

Rounded stream cobble

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

Speckled rounded stone, likely granite or granitic gneiss

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

Milky quartz (rough quartz fragment)

Quartz, silicon dioxide (SiO₂)

Pink Granite

Phaneritic Felsic Igneous Rock (Granite)

Iron-stained quartz-bearing rock fragment

Likely quartz with iron-oxide staining; exact rock type cannot be determined from the image