Tumbled chalcedony or quartz pebble
Microcrystalline quartz, SiO₂ (likely chalcedony); exact identification is uncertain from the image
mineral
Category
Man Made Material (Simulated Mineral)
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Granodiorite
Granodiorite
Igneous
Chert (Flint)
Silicon Dioxide (SiO2)
sedimentary
Polished brecciated jasper pendant
Jasper, an opaque microcrystalline variety of chalcedony (mostly SiO₂), with iron-oxide staining and likely brecciation
mineral
Pumice or vesicular volcanic tuff
Pumice: highly vesicular volcanic glass, chiefly rhyolitic to dacitic; possible tuff: lithified ash and pumice fragments
igneous
Quartz (Microcrystalline/Chert)
Silicon Dioxide (SiO2)
mineral
Diamond (in jewelry setting)
Carbon (C)
mineral
Flint (chert) nodule
Microcrystalline quartz (SiO₂), occurring as a flint/chert nodule in limestone
sedimentary
Red Sandstone
Arenite (Fe2O3 enriched)
sedimentary
Pale green aventurine (likely quartz) sphere
Quartz, SiO₂; possibly pale green aventurine, with color from inclusions or treatment
mineral
Flint (chert)
Microcrystalline quartz (SiO₂), a variety of chert
sedimentary
Chert
Sedimentary cryptocrystalline silica (SiO2)
sedimentary
Chert (White Chert/Flint)
Microcrystalline Quartz (SiO2)
sedimentary
Chert (variations include Flint)
Microcrystalline or cryptocrystalline Quartz (SiO2)
sedimentary
Graphite
Graphite (Carbon, C)
mineral
Sandstone
Arenite
sedimentary
Sunstone (Aventurine Feldspar)
(Ca,Na)((Al,Si)2Si2O8) with inclusions of Cu or Fe2O3
mineral
Flint
Silicon dioxide (SiO2)
sedimentary
Granodiorite / Granite (Weathered)
Granodiorite
Igneous
Likely tumbled epidote-bearing rock or green jasper
Epidote-group silicate, possibly in a jasper or serpentinite matrix
mineral
Polished hematite (specimen identification uncertain)
Hematite, α-Fe₂O₃
mineral
Flint (chert)
Microcrystalline quartz (SiO₂), a variety of chert
sedimentary
Tektite
Natural impact glass
meteorite
Unknown dark mineral/rock fragment
Indeterminate; possibly a dark sulfide mineral or slag-like geological fragment
mineral
Gem-set gold ring
Gold alloy setting with a colorless faceted gemstone, possibly quartz or glass; the stone cannot be identified reliably from the image
gemstone
Iron-stained quartz-rich rock, possibly jasper or chert
Microcrystalline quartz (SiO₂) with iron oxides/hydroxides
mineral
Polished black stone pendant
Likely black obsidian or black tourmaline; exact identification is uncertain from the photograph
mineral
Turquoise-style beaded bracelet
Turquoise, hydrated copper–aluminum phosphate: CuAl₆(PO₄)₄(OH)₈·4H₂O; possibly dyed or composite beads
mineral
Chert (likely flint)
Microcrystalline quartz (SiO₂), variety chert; flint is a dark chert variety
sedimentary
Turquoise bead bracelet
Turquoise — hydrated copper aluminum phosphate, CuAl₆(PO₄)₄(OH)₈·4H₂O
mineral
Amethyst crystal fragment
Quartz, silicon dioxide (SiO₂), purple variety colored mainly by iron and irradiation
gemstone
Turquoise cabochon ring
Turquoise — hydrated copper aluminum phosphate, CuAl₆(PO₄)₄(OH)₈·4H₂O
gemstone
Coquina
Bioclastic Limestone
sedimentary
Tumbled yellow jasper or chalcedony
Microcrystalline quartz, SiO₂; likely iron-oxide-bearing jasper/chalcedony
mineral
Sandstone
Arenite (SiO2 composition dominant)
sedimentary
Concrete-like aggregate surface with embedded rock fragments
Anthropogenic concrete or exposed aggregate; not a natural rock specimen
sedimentary
Sandstone (with potential Arkose/Lithic characteristics)
Arenite (Sedimentary rock composed of sand-sized grains)
sedimentary
Slate
Metamorphic Pelitic Rock
metamorphic
Chert (Jasper/Flint variety)
Silicon Dioxide (SiO2)
sedimentary
Chert or Jasper
Microcrystalline Quartz (SiO2)
sedimentary
Chert (likely flint)
Microcrystalline quartz, SiO₂
sedimentary
Possible yellow agate or chalcedony bead
Microcrystalline quartz (SiO₂), likely chalcedony; identification is uncertain from the photo
mineral