Basalt with Fusion Crust (Meteorite-like appearance)
Vesicular Basalt
igneous
Category
Not A Geological Specimen
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Quartzite Pebble (or Quartz Pebble)
Quartzite (SiO2)
metamorphic
Sandstone (with differential weathering)
Arenite / Quartz Sandstone (SiO2)
sedimentary
Pyrite in Shale
Iron Sulfide (FeS2) in Argillaceous Shale
sedimentary
Desert Rose (Gypsum Rose / Barite Rose)
Calcium Sulfate Dihydrate (CaSO4·2H2O) or Barium Sulfate (BaSO4) with Sand inclusions
mineral
Septarian Nodule (Pebble)
Septarian concretion (composition: CaCO3, calcite, aragonite, and clay/mudstone)
sedimentary
Granite Pebble
Granite
igneous
Fossilized Coral
Scleractinia (Agatized or Calcite replaced)
fossil
Quartz Geode Fragment
Silicon Dioxide (SiO2)
mineral
Ring with an Orange Inlay
N/A (Man-made object)
Man-made Object (Ring)
Polished amethyst bead fragments
Amethyst, purple quartz (SiO₂)
gemstone
Iron-rich metamorphic rock, likely banded iron formation fragment
Banded iron formation (BIF), chiefly hematite–magnetite with chert; exact identification requires testing
metamorphic
Weathered iron-rich sandstone or ironstone
Ferruginous sandstone, likely limonite/goethite-cemented quartz arenite
sedimentary
Petrified Wood
Silicified Wood (primarily SiO2)
fossil
Gneiss Pebble
Gneiss (Metamorphic Foliated Rock)
metamorphic
Mica Schist / Granite
Mica Schist (Silicate metamorphic rock)
metamorphic
Coral Fossil (Petoskey-style or Colonial)
Hexagonaria percarinata (Order: Rugosa)
fossil
Basalt with Chert or Jasper Inclusion
Igneous basalt / sedimentary chert nodule
igneous
Eclogite with Garnet
Eclogite (Omphacite-Garnet Metamorphic Rock)
metamorphic
Quartz Geode / Druzy Quartz
Silicon Dioxide (SiO2)
mineral
Petrified Wood
Silicified Wood / Chalcedony (SiO2)
mineral
Fossiliferous Limestone with Rugose Coral
Calcite (CaCO3) containing a Rugosa (Horn Coral) fossil
sedimentary
Artificial Rock Face (Faux Rock)
Glass Fiber Reinforced Concrete (GFRC)
man-made/construction material
Quartz Geode (Nodule)
Silicon Dioxide (SiO2)
sedimentary or igneous
Fossilized Coral (Petoskey Stone or similar Rugose Coral)
Hexagonaria percarinata (or similar Rugose/Tabulate coral)
fossil
Fossilized Coral (Petoskey-like or Favosites)
Anthozoa (Fossilized Coral)
sedimentary
Gold Ore
Auriferous Quartz and Sulfide Mineralization in Host Rock
igneous
Banded Agate (Agatized Geode Slice)
Silicon Dioxide (SiO₂)
mineral
Limonite / Goethite (Iron Ore Mineral nodule)
FeO(OH)·nH2O / FeO(OH)
mineral
Petrified Wood
Silicified Wood (SiO2 permineralization)
fossil
Petrified Wood
Silicified Wood (SiO2)
fossil
Petrified Wood
Silicified wood (principally SiO2)
sedimentary
Pyrite in Slate
Iron Sulfide (FeS2) in Slate host matrix
metamorphic
Petrified Wood
Silicified Wood (SiO2)
metamorphic
Ironstone Concretion (Moqui Marble type)
Ironstone Concretion (Fe2O3 with SiO2 core)
sedimentary
Amygdaloidal Basalt
Amygdaloidal Basalt (containing quartz/agate or zeolite fill)
igneous
Banded Sedimentary Rock (Siltstone/Mudstone with concretion)
Siltstone with Ferruginous Banding
sedimentary
Basalt with Quartz Vein
Aphanitic Mafic Igneous Rock with Quartz (Silica) Intrusion
igneous
Septarian Nodule or Mud Crack Fossil
Septarian Nodule (Concretion)
sedimentary
Polished Septarian Nodule
Septarian calcite–aragonite concretion, commonly with barite or celestine
sedimentary
Gneiss
Metamorphic Gneiss
metamorphic
Tektite (Indochinite)
Tektite (SiO2 + Al2O3)
mineraloid