Limonite Concretion (Ironstone)
Limonite (Hydrated Iron(III) Oxide-Hydroxide, FeO(OH)·nH2O)
sedimentary
Category
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Sandstone
Arenite
sedimentary
Tumbled basalt pebble
Basalt; fine-grained plagioclase feldspar and pyroxene, commonly with olivine and iron oxides
igneous
Small white crystalline mineral fragment
Indeterminate; possibly calcite or quartz
mineral
Turquoise (small irregular fragment)
Turquoise, hydrated copper aluminum phosphate: CuAl₆(PO₄)₄(OH)₈·4H₂O
gemstone
Limonite Nodules / Goethite
Hydrated Iron Oxide-Hydroxide (FeO(OH)·nH2O / Fe2O3·nH2O)
mineral
Sandstone
Arenite (predominantly SiO2)
sedimentary
Limonite (Iron Ore Congcretion)
Limonite (a mixture of hydrated iron(III) oxide-hydroxides, FeO(OH)·nH2O)
mineral
Sandstone
Clastic sedimentary rock (quartz arenite)
sedimentary
Sandstone
Arenite
sedimentary
Limonite Concretion (Ironstone)
Limonite (FeO(OH)·nH2O) / Goethite
sedimentary
Greenstone / altered basalt fragment
Likely chlorite–epidote–actinolite altered basalt; exact identification requires testing
igneous
Colorless faceted gemstone, likely glass or cubic zirconia
Uncertain; possible cubic zirconia (zirconium dioxide, ZrO₂) or synthetic glass
gemstone
Yellow Ochre / Limonite
Hydrated ferric oxide (FeO(OH)·nH2O)
mineral
Hag Stone
Perforated Flint or Limestone
sedimentary
Sandstone (Quartzose Sandstone)
Arenite (composed primarily of SiO2)
sedimentary
Limonite Concretion
FeO(OH)·nH2O (Hydrated Iron Oxide)
sedimentary
Limonite (Iron Ore)
FeO(OH)·nH2O
mineral
Generic Rock Sample
Undetermined geological specimen
igneous
Limonite Concretion
Hydrated Iron Oxide-Hydroxide, FeO(OH)·nH2O
mineral
Limonite (Iron Ore)
Limonite (Hydrous iron(III) oxide-hydroxide mixture, primarily FeO(OH)·nH2O)
mineral
Not a rock, mineral, or geological specimen
N/A
Porphyritic Basalt (likely artificially dyed or altered)
Basalt with plagioclase phenocrysts (likely treated)
igneous
Basalt Pebble and Shale Fragment
Extrusive volcanic rock and fine-grained sedimentary rock
igneous and sedimentary
Sandstone
Arenite (SiO2 based)
sedimentary
Painted River Pebble (likely Basalt or Greywacke)
Aphanitic Lithic Clast with Anthropogenic Pigment coating
Sedimentary or Igneous
Blue Slag Glass
Amorphous Silica (Industrial byproduct)
Antropogenic (Man-made glass byproduct)
Limonite/Ironstone
Limonite (Hydrous ferric oxides), FeO(OH)·nH2O
sedimentary
Sandstone
Clastic Sedimentary Rock
sedimentary
Limonite (with goethite)
Hydrated Iron(III) Oxide-Hydroxide (FeO(OH)·nH2O)
mineral
Blue Dyed Agate
Silicon Dioxide (SiO2) with artificial pigment
gemstone
Sandstone
Sandstone (SiO2-rich detrital sedimentary rock)
sedimentary
Yellow Ochre / Limonite
Limonite (inter-mixed iron oxides and hydroxides, primarily FeO(OH)·nH2O)
mineral
Opalite (Man-made Glass)
Synthetic Opalised Glass
mineral
Chrysocolla-bearing copper ore
Chrysocolla, hydrated copper phyllosilicate: approximately (Cu,Al)₂H₂Si₂O₅(OH)₄·nH₂O; possibly mixed with malachite/black copper oxides
mineral
River Rock
Mixed lithology clast
sedimentary
Colorless faceted gemstone, likely cubic zirconia or diamond
Uncertain from image; cubic zirconia (ZrO₂) is a common diamond simulant, while diamond is crystalline carbon (C)
gemstone
Quartz-veined Metamorphic Pebble
Silicate-rich metamorphic rock with quartz veins (SiO2)
metamorphic
Sandstone
Sandstone (Sedimentary rock composed of silicate grains)
sedimentary
Mystic Topaz
Aluminum silicate fluoride hydroxide with titanium coating (Al2SiO4(F,OH)2)
mineral
Limonite (Yellow Ochre)
Hydrated iron(III) oxide-hydroxide (FeO(OH)·nH2O)
mineral
Small rounded pebble, likely quartz-rich river or beach stone
Unidentified lithic pebble; exact rock type cannot be determined from the image
sedimentary