Weathered quartz-rich rock, likely milky quartz/quartzite
Quartz (SiO₂), possibly quartzite with minor iron-oxide staining
metamorphic
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Non Geological
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Terrazzo flooring containing marble aggregate
Marble (recrystallized calcite, CaCO₃) aggregate in cementitious terrazzo
metamorphic
Fossil Brachiopod
Phylum Brachiopoda
fossil
Travertine / Tufa
Calcium Carbonate (CaCO3)
sedimentary
Breccia
Sedimentary Breccia
sedimentary
Iron Ore / Hematite / Ironstone Nodule
Hematite / Goethite (Fe2O3 / FeO(OH))
sedimentary
Fossil Coral (Tabulate Coral Fragment)
Anthopleura / Tabulata (CaCO3 - Calcium Carbonate)
fossil
Moqui Marble
Hematite-Goethite Concretion
sedimentary
Quartz-veined Sandstone Pebble
Quartzite-veined Arenite
sedimentary
Basalt Pebble
Aphanitic mafic extrusive igneous rock
igneous
Chert Arrowhead (Projectile Point)
Microcrystalline Quartz (Chert or Flint)
sedimentary
Biotite Schist
Biotite-rich Schist
metamorphic
Goethite Concretion
Goethite (FeO(OH))
sedimentary
Basalt with Quartz Vein
Basaltic rock with hydrothermal SiO2 filling
igneous
Epidote
Epidote (Ca2(Al2,Fe3+)(SiO4)(Si2O7)O(OH))
metamorphic
Moqui Marble (Shaman Stone)
Iron Oxide Concretion (Hematite/Goethite)
sedimentary
Fossiliferous Shale
Sedimentary Clastic Rock with fossil inclusions (likely Brachiopod or Bivalve impressions)
fossil
Quartz Veined Mudstone
Metasedimentary rock with Quartz (SiO2) veins
metamorphic
Petrified Wood
Silicified Wood (primarily SiO2)
fossil
Quartz Geode
Silicon Dioxide (SiO2) in sedimentary host rock
sedimentary
Favosites Fossil (Honeycomb Coral)
Favosites alpenensis (Order: Tabulata)
fossil
Manganese Dendrite on Siltstone
Manganese Oxide (pyrolusite or psilomelane) Dendrites
mineral/sedimentary
Epidosite (Epidote-Quartz rock)
Epidote-rich hydrothermal rock
metamorphic
Petrified Wood
Silicified Wood (primarily SiO2)
fossil
Iron Concretion
Ferruginous concretion (Fe2O3·nH2O / FeO(OH))
sedimentary
Basalt Pebble
Basalt (Mafic volcanic rock)
igneous
Petrified Wood
Silicified Wood (SiO2)
mineral
Petrified Wood
Silicified Wood (SiO2 permineralization)
sedimentary
Fossilized Coral (Favosites)
Favosites goldfussi / Tabulata
sedimentary
Sandstone with Liesegang Rings
Arenite with Iron Oxide Liesegang Banding
sedimentary
Petoskey Stone
Hexagonaria percarinata (Fossilized Rugose Coral)
sedimentary
Petrified Wood
Silicified Wood (primarily SiO2 - Silicon Dioxide / Chalcedony)
metamorphic
Pyrite in Shale
Iron Sulfide (FeS2) in Argillaceous Shale
sedimentary
Stromatolite
Biogenic Sedimentary Rock (Lithified microbial mat)
sedimentary
Ironstone Concretion (Moqui Marble variety)
Ferruginous Sandstone Concretion
sedimentary
Brachiopod Fossil (Spiriferid)
Phylum Brachiopoda, Order Spiriferida (CaCO3 - Calcium Carbonate)
sedimentary (fossilized organic remains)
Ironstone Concretion
Siderite or Hematite Concretion (FeCO3 or Fe2O3)
sedimentary
Quartz Vein in Host Rock
Silicon Dioxide (SiO2) in matrix
mineral/igneous
Yellow Jasper
Silicon dioxide (SiO2)
sedimentary
Moqui Marble / Ironstone Concretion
Ironstone Concretion (Goethite/Hematite and Sandstone)
sedimentary
Fulgurite
Fulgurite (Lechatelierite-rich fused silica)
mineraloid / sedimentary (secondary formation)
Garnet Schist
Almandine-Mica Schist
metamorphic