Man Made Object (Metal Alloy)

Colorless faceted gemstone, likely glass or quartz

Uncertain; appearance is consistent with faceted quartz (SiO₂), but cut glass or cubic zirconia cannot be excluded from the photograph

Cut diamond tennis-chain jewelry

Diamond, crystalline carbon (C), cubic crystal system

Quartz-rich stone tool or shaped mineral specimen

Likely milky quartz or quartzite (SiO₂); exact material cannot be confirmed from the image

Polished banded agate

Agate, a banded variety of microcrystalline quartz (SiO₂; chalcedony)

Paving-concrete aggregate with a rounded stone

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

Gold Ore (in Quartz/Gossan matrix)

Native Gold (Au) in Limonite/Quartz matrix

Granite

Phaneritic Igneous Rock (primarily Quartz, Feldspar, and Mica)

Small metallic-gold mineral fragment, possibly pyrite

Pyrite (FeS₂), if confirmed

Granite

Granite (plutonic igneous rock)

Quartz crystal cluster (likely iron-stained quartz)

Quartz, silicon dioxide (SiO₂), with possible iron-oxide inclusions

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

Microcrystalline quartz (SiO₂) with iron oxides/hydroxides

Polished banded agate (probable)

Microcrystalline quartz, SiO₂ (chalcedony/agate)

Chert (varieties: Flint or Jasper)

Silicon dioxide (SiO2) / Microcrystalline Quartz

Tumbled brown agate (probable)

Microcrystalline quartz, SiO₂ (chalcedony/agate)

Polished jasper pebble

Jasper, microcrystalline quartz (SiO₂) with iron-oxide impurities

Coquina

Bioclastic Limestone (composed primarily of CaCO3)

Gold Nugget

Native Gold (Au)

Polished rose quartz bowl

Quartz, silicon dioxide (SiO₂), likely rose quartz

Polished black-and-white banded agate (likely dyed or painted)

Chalcedony (microcrystalline quartz), SiO₂; exact banding variety uncertain

Milky Quartz with Mineral Inclusions

Quartz (Silicon Dioxide, SiO2)

Quartz cabochon ring (stone identity uncertain)

Quartz, SiO₂ (possible smoky or included quartz)

Rhodonite

Manganese Silicate (Mn, Fe, Mg, Ca)SiO3

Tumbled jasper

Microcrystalline quartz (SiO₂), commonly iron-rich jasper

Milky Quartz

Silicon Dioxide (SiO2)

Likely ironstone concretion or weathered iron-rich rock

Goethite/hematite-bearing limonite (FeO(OH)·nH₂O / Fe₂O₃)

Milky Quartz Pebble

Silicon Dioxide (SiO2)

Polished green moss agate cabochon

Moss agate: microcrystalline quartz (SiO₂) with included chlorite/actinolite or iron-manganese minerals

Sandstone

Arenite (composed primarily of Quartz: SiO2)

Faceted purple-blue beads, likely synthetic glass or treated gemstone

Indeterminate; possible synthetic corundum, synthetic spinel, or dyed quartz (SiO₂)

Serpentinite (likely serpentinized ultramafic rock)

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

Uncertain dark metallic mineral specimen

Possibly galena (lead sulfide, PbS), though the image is too blurred for reliable identification

Pyrite

Iron Sulfide (FeS2)

Likely biotite-rich mica schist

Mica schist, chiefly biotite (K(Mg,Fe)₃AlSi₃O₁₀(F,OH)₂); exact identification from image is uncertain

Tumbled black obsidian

Obsidian (volcanic glass), primarily rhyolitic silica glass

Polished Ocean Jasper (likely orbicular jasper)

Microcrystalline quartz/chalcedony (SiO₂) with iron oxides and other accessory minerals

Milky Quartz

Silicon Dioxide (SiO2)

Jasper (specifically a banded or dark variety)

Silicon Dioxide (SiO2) with impurities

Milky Quartz

Silicon Dioxide (SiO2)

Serpentinite

Serpentinite (Mg, Fe, Ni, Al, Zn, Mn)2-3(Si, Al, Fe)2O5(OH)4

Iron Meteorite (Oxidized)

Iron-Nickel Alloy (Fe, Ni)

Polished banded agate, likely moss or dendritic agate

Microcrystalline quartz (chalcedony), SiO₂, with iron/manganese inclusions

Granite

Granite, a coarse-grained intrusive felsic rock composed mainly of quartz, feldspar, and mica