Metamorphic (Man Made)

Sodalite

Sodalite - Na8(Al6Si6O24)Cl2

Milky quartz pebble

Quartz, silicon dioxide (SiO₂)

Colorless faceted gemstone, likely quartz

Quartz (SiO₂), tentative identification; the photo is insufficient to confirm the material

Goldstone (likely blue-free synthetic goldstone pendant)

Synthetic aventurine glass; silica glass with dispersed metallic copper crystals

Brown chert (flint)

Microcrystalline quartz (SiO₂), varieties called chert or flint

Red cabochon gemstone ring (likely glass or synthetic stone)

Undetermined; the image does not establish a natural mineral identity

Quartz on Chlorite Schist

Chlorite Schist (Mg,Fe)3(Si,Al)4O10(OH)2 with Quartz (SiO2)

Chert (possibly a worked stone flake)

Microcrystalline quartz, SiO₂

Blue glassy cabochon, likely blue quartz or synthetic glass

Possibly dyed blue chalcedony/quartz (SiO₂); visual identification is inconclusive

Beaded mineral/crystal jewelry (likely turquoise and coral accents)

Variable; blue beads may be turquoise (CuAl6(PO4)4(OH)8·4H2O), with possible dyed howlite, glass, or composite materials

Paving-concrete aggregate with a rounded stone

Polymictic gravel aggregate; the central clast appears to be weathered sandstone or volcanic rock

Basalt

Basalt

Banded Metamorphic Rock (likely Quartzite or Serpentinite/Soapstone)

Metamorphic Rock (possibly a banded Quartzite or a foliated Serpentinite/Talc Schist based on appearance, general term for such a rock is 'Banded Metamorphic Rock' or 'Gneiss' if pronounced banding of different minerals)

Likely slate fragment

Slate; fine-grained foliated metamorphic rock, commonly quartz–mica–chlorite rich

Yellow chalcedony (likely agate) cabochons

Microcrystalline quartz, SiO₂; chalcedony variety, possibly naturally colored or dyed

Rounded green-gray pebble, likely serpentinite

Serpentinite; chiefly serpentine-group minerals (antigorite, lizardite, chrysotile), commonly with magnetite

Granite

Granite (plutonic igneous rock)

Iron-stained quartz-rich rock, possibly jasper or chert

Microcrystalline quartz (SiO₂) with iron oxides/hydroxides

Flint or chert, possibly a knapped stone tool

Microcrystalline quartz (SiO₂), commonly chalcedony with possible carbonaceous impurities

Tumbled quartz-rich pebble, possibly milky quartz or quartzite

Quartz (SiO₂), potentially quartzite if metamorphically recrystallized

Quartz-rich rock fragment

Likely milky quartz (SiO₂), possibly a pale quartzite fragment

Milky quartz fragment

Quartz (silicon dioxide, SiO₂)

Milky quartz

Quartz, silicon dioxide (SiO₂)

Milky quartz

Quartz (silicon dioxide, SiO₂)

Cleaved feldspar crystal (likely plagioclase)

Plagioclase feldspar, approximately NaAlSi₃O₈–CaAl₂Si₂O₈ solid solution

Ruby

Corundum (Al2O3 with chromium impurities)

Polished greenstone (likely serpentine or altered basalt)

Serpentinite, mainly serpentine-group minerals (Mg₃Si₂O₅(OH)₄); exact identification requires testing

Sandstone

Arenite (composed primarily of Quartz: SiO2)

Gneiss

Foliated quartz–feldspar gneiss, likely biotite-bearing

Carved yellow stone butterfly

Undetermined; possibly carved soapstone (talc-rich rock) or another soft ornamental stone

Likely green-gray serpentine-bearing rock

Serpentinite, dominated by serpentine-group minerals (antigorite/lizardite; Mg₃Si₂O₅(OH)₄), possibly with chlorite or talc

Rock crystal quartz fragment

Quartz (silicon dioxide, SiO₂)

Fossilized echinoid (sea urchin), likely a flint/chalk-associated test

Echinoid fossil; likely a regular echinoid such as Echinocidaris or related taxon, composed mainly of recrystallized calcite (CaCO₃)

Diabase (Dolerite)

Diabase / Dolerite

Land Snail Shell

Gastropoda (Calcium Carbonate, CaCO3)

Milky quartz

Quartz (silicon dioxide, SiO₂)

Biotite Mica Schist

Metamorphic Rock containing Biotite K(Mg,Fe)3AlSi3O10(OH)2

Blue glass-like tumbled specimen

Most likely cobalt-blue slag glass or manufactured glass; not confidently identifiable as a natural mineral from the image

Granite with Epidote

Granite, containing quartz, feldspar, and epidote

Sandstone

Arenite

Likely biotite mica

Biotite, a dark mica-group mineral; approximate formula K(Mg,Fe)₃AlSi₃O₁₀(F,OH)₂

Likely blue-gray slate

Slate, a fine-grained rock composed mainly of mica-group minerals and quartz