Mineral (Man Modified)

Green-and-white marble (likely serpentine-bearing marble)

Calcite- or dolomite-rich marble with green serpentine/chlorite minerals; exact identification requires testing

Tufa (Vesicular Limestone)

Tufa (form of Calcium Carbonate, CaCO3)

Milky Quartz

Silicon Dioxide (SiO2)

Likely serpentine-rich rock (serpentinite)

Serpentinite, composed mainly of serpentine-group minerals (e.g., lizardite, antigorite, or chrysotile); exact identification is uncertain from the image alone

Likely brown ironstone or limonite-rich rock fragment

Ironstone, chiefly iron oxides/hydroxides such as goethite (α-FeO(OH)) and limonite

Quartz with Iron Staining

Silicon Dioxide (SiO2)

Pink Feldspar (Orthoclase)

Orthoclase Feldspar (KAlSi3O8)

Iron-stained quartz (likely milky quartz with limonite staining)

Quartz, SiO₂, with iron-oxide/hydroxide coatings (commonly goethite or limonite)

Blue mineral specimen, likely bornite (“peacock ore”)

Bornite, Cu5FeS4, possibly iridescent chalcopyrite (CuFeS2)

Milky Quartz

Quartz (SiO2)

Polished fossil coral

Fossilized colonial coral, commonly Hexagonaria (Petoskey stone) or related rugose/tabulate coral

Weathered jasper (iron-stained chert)

Microcrystalline quartz/chalcedony, SiO₂, with iron-oxide impurities

Polished black obsidian

Volcanic glass, chiefly SiO₂

Native Copper

Native Copper (Cu)

Banded gneiss pebble

Feldspar–quartz gneiss; exact mineral composition cannot be confirmed from the image

Iron-rich rock, possibly hematite-rich ore

Likely hematite (Fe₂O₃) with possible goethite or host-rock minerals; identification is uncertain from the image alone

Olivine in Quartz/Feldspar Matrix (Peridotite or Granitic Pegmatite)

(Mg,Fe)2SiO4 (Olivine) with Quartz / Feldspar

Hornblende–biotite schist (probable)

Amphibole–mica schist; chiefly hornblende, biotite, quartz, and feldspar

Sandstone (Quartzite-rich)

Clastic sedimentary rock (primarily SiO2)

Vesicular basalt

Basalt, a mafic volcanic rock composed mainly of plagioclase feldspar, pyroxene, and often olivine

Fossil-bearing limestone

Calcite-rich limestone (mainly CaCO₃), with a possible shell fossil

Chalcedony

Silicon Dioxide (SiO2)

Fluorite

Calcium fluoride (CaF2)

Fluorite

Calcium Fluoride (CaF2)

Man-made Carved Stone (Scream Mask/Skull motif)

Carved Soapstone or Serpentine-rich rock

Milky Quartz

Silicon Dioxide (SiO2)

Possible iron-rich concretion or weathered ironstone

Goethite/hematite-bearing limonite concretion (tentative)

Likely serpentine-rich ultramafic rock

Serpentinite; chiefly serpentine-group minerals (Mg3Si2O5(OH)4), commonly with magnetite and relict olivine/pyroxene

Serpentinite (likely)

Serpentinite; chiefly serpentine-group minerals, Mg₃Si₂O₅(OH)₄, with possible magnetite, brucite, or chromite

Fluorite

Calcium Fluoride (CaF2)

Likely milky quartz

Quartz, SiO₂

Pyrite (Fool's Gold)

Iron Sulfide (FeS2)

Milky quartz with iron staining

Quartz (SiO₂), likely iron-oxide-stained

Gneiss

Foliated quartz–feldspar gneiss, likely biotite-bearing

Quartz (Tumbled)

Silicon Dioxide (SiO2)

Scoria (vesicular basalt)

Vesicular basalt; chiefly plagioclase, pyroxene, and iron-rich volcanic glass

Tumbled quartz (likely milky/rose quartz)

Quartz, silicon dioxide (SiO₂)

Polished banded calcite pendant (often sold as “onyx marble” or “banded onyx”)

Calcite, CaCO₃; trade name “onyx marble”

Quartz vein with iron staining and dark sulfide/oxide minerals

Quartz (SiO₂), with probable iron oxides and unidentified dark sulfides

Polished turquoise sphere with purple matrix/inclusion

Turquoise, hydrated copper–aluminum phosphate; approximate formula CuAl₆(PO₄)₄(OH)₈·4H₂O

Fluorite

Calcium Fluoride (CaF2)

Quartz (Crystal Point/Fragment)

Silicon Dioxide (SiO2)