Gastropod Fossil (Snail Internal Mold)
Gastropoda; internal mold (steinkern), often composed of Calcium Carbonate (CaCO3) or Silica (SiO2)
sedimentary
Category
Non Geological
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Petrified Wood
Silicified Wood (SiO2)
metamorphic
Desert Rose
Gypsum (CaSO4·2H2O) or Barite (BaSO4) inclusions in sand
mineral
Moqui Marble (Concretion)
Iron Oxide Concretion (Hematite/Goethite)
sedimentary
Petrified Wood
Silicified Wood (SiO2)
mineral
Gold Ore
Auriferous Quartz and Sulfide Mineralization in Host Rock
igneous
Stromatolite
Biogenic Sedimentary Rock (Precambrian Stromatolite fossil)
sedimentary
Petrified Wood
Silicified wood (Quartz/Chalcedony replacement) SiO2
sedimentary
Chert Arrowhead
Microcrystalline Quartz (SiO2)
sedimentary
Gold-Bearing Quartz Ore
Crystalline Silicon Dioxide (SiO2) with Trace Aurum (Au)
mineral
Petrified Wood
Silicified Wood (primarily SiO₂)
sedimentary
Quartz Vein in Host Rock (Gneiss/Schist)
Silicon Dioxide (SiO2) within a metamorphic matrix
metamorphic
Horn Coral Fossil
Rugosa (Order Rugosa)
sedimentary
Drill Core (Basalt or Andesite)
Volcanic porphyry (mafic to intermediate)
igneous
Ironstone Concretion (Moqui Marble type)
Ironstone Concretion (Fe2O3 with SiO2 core)
sedimentary
Banded Iron Formation (Fragment)
Banded Iron Formation (BIF)
sedimentary
Muscovite Schist
Metamorphic rock primarily composed of quartz and muscovite mica
metamorphic
Fossil Coral (Petoskey Stone / Rugose Coral)
Hexagonaria percarinata (or similar fossilized rugose/tabulate coral)
fossil
Gneiss (Metamorphic Pebble)
Metamorphic Rock (Quartz-Feldspar-Biotite Gneiss)
metamorphic
Conglomerate / Breccia Matrix (Aggregated Rock)
Sedimentary Breccia / Conglomerate
sedimentary
Garnet (Almandine)
Fe3Al2(SiO4)3
mineral
Quartz Pebble
Silicon Dioxide (SiO2)
sedimentary
Banded Iron Formation
Banded Iron Formation (BIF)
sedimentary
Petrified Wood
Silicified Wood (SiO2)
fossil
Tektite (Indochinite)
Tektite (High-silica natural glass)
meteorite
Banded Iron Formation
Banded Iron Formation (BIF)
sedimentary
Chert Nodules in Limestone
Microcrystalline Quartz (SiO2) within Calcium Carbonate (CaCO3)
sedimentary
Sandstone Concretion
Carbonate-cemented Sandstone Concretion
sedimentary
Conglomerate (Pebble Conglomerate)
Conglomerate
sedimentary
Rough Chalcedony / Jasper Nodules
Silicon Dioxide (SiO2)
mineral
Vesicular Basalt / Scoria (with Iron Oxide Alteration)
Vesicular Basalt
igneous
Chrysocolla (with Malachite / Secondary Copper Minerals)
Cu2-xAlx(H2-xSi2O5)(OH)4·nH2O
mineral
Druzy Agate Geode
Silicon Dioxide (SiO2) - Microcrystalline Quartz
sedimentary
Sandstone (Ferruginous)
Arenite (with Iron Oxide cement)
sedimentary
Honeycomb Coral Fossil (Favosites)
Favosites (Order Tabulata)
fossil
Gossanous Sandstone (likely Terrestrial)
Arenite with Iron-Oxide inclusions
sedimentary
Auriferous Quartz (Gold-bearing Quartz)
Silicon Dioxide (SiO2) with trace Gold (Au) and Iron Oxides
mineral
Limonite (Ironstone Concretion)
Limonite: FeO(OH)·nH2O
sedimentary
Septarian Nodule (or Mudstone with Septarian Cracking)
Septarian Concretion (Composition: Calcite, Aragonite, and Limestone/Claystone)
sedimentary
Quartz Geode (Cracked)
Silicon Dioxide (SiO2)
mineral
Fossilized Bored Limestone
Limestone with Ichnofossils (Gastrochaenolites or Entobia)
sedimentary
Fossil Coral (Rugose Coral)
Rugosa (extinct order of solitary and colonial corals)
sedimentary