Brachiopod Fossil
Phylum Brachiopoda (Class Rhynchonellata)
sedimentary
Category
Non Geological
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Petrified Wood (Silicified Wood)
Silicified Wood (primarily Chalcedony/Quartz, SiO2)
mineral
Fossil Bivalve Shell
Class Bivalvia (e.g., Veneriidae family)
sedimentary
Chert Concretion
Silicon dioxide (SiO2)
sedimentary
Sandstone (Banded)
Clastic sedimentary rock (primarily SiO2)
sedimentary
Petrified Wood
Silicified wood (principally Silicon Dioxide, SiO2)
sedimentary
Petrified Wood (Silicified Fossil)
Silicified Wood (SiO2)
sedimentary
Sandstone (Pebble)
Arenite (composed primarily of SiO2)
sedimentary
Brachiopod Fossil
Phylum Brachiopoda (replaced by Calcite or Silica)
sedimentary
Fossilized Tabulate Coral (Honeycomb Coral)
Favosites (Order: Tabulata)
sedimentary
Petrified Wood
Silicified wood (Quartz variant, SiO2)
sedimentary
Petrified Wood
Silicified Wood (SiO2)
mineral
Gastropod Fossil (Snail Steinkern)
Class Gastropoda (internal mold)
sedimentary
Almandine Garnet
Almandine (Fe3Al2Si3O12)
mineral
Garnet
Garnet (X3Y2(SiO4)3)
mineral
Petrified Wood
Silicified Wood (primarily SiO2)
metamorphic
Petrified Wood
Silicified Wood (primarily SiO2)
sedimentary
Brachiopod Fossil
Phylum Brachiopoda (likely Order Rhynchonellida or Spiriferida)
sedimentary
Almandine Garnet
Almandine - Fe3Al2(SiO4)3
mineral
Peridot
Olivine (Magnesium Iron Silicate), (Mg, Fe)2SiO4
mineral
Quartz Geode Fragment
Silicon Dioxide (SiO2)
mineral
Kimberlite with Diamond
Kimberlite (Porphyritic Peridotite)
igneous
Fossilized Shark Tooth (Dermal Denticle or worn tooth fragment)
Elasmobranchii (fossil remains)
sedimentary
Agatized Petrified Wood
Silicon Dioxide (SiO2) - Chalcedony pseudomorph after Wood
metamorphic
Petrified Wood
Silicified Wood (SiO2)
mineral
Petrified Wood
Silicified Wood (SiO2)
sedimentary
Petrified Wood (Agatized/Silicified Wood)
Silicified Paleoxylon (primarily SiO2)
sedimentary
Moqui Marble (Iron Concretion)
Hematite/Goethite Concretion (Fe2O3 / FeO(OH))
sedimentary
Quartz Geode
Silicon Dioxide (SiO2) within a geode
mineral
Quartz Geode
Silicon Dioxide (SiO2)
mineral
Basalt with Chert or Jasper Inclusion
Igneous basalt / sedimentary chert nodule
igneous
Petrified Wood
Silicified wood (Quartz/Chalcedony replacement)
fossil
Fossil Bivalve / Ostreid Shell (Hag Stone / Perforated Pebble)
Phylum Mollusca, Class Bivalvia
fossil
Fossilized Coral (Petoskey Stone or similar Rugose Coral)
Hexagonaria percarinata (or similar Rugose/Tabulate coral)
fossil
Porphyritic Igneous Rock / Basalt or Andesite Xenolith in Granite or Quartzite
Silicate rock with contrasting xenolith/inclusion
igneous
Limonite / Iron Oxide Concretion
Hydrated iron(III) oxide-hydroxide, FeO(OH)·nH2O
mineral
Basalt Xenolith in Matrix
Basaltic Mafic Xenolith / Ultra-mafic Inclusion
igneous
Petrified Wood
Silicified Wood (SiO2)
fossil
Quartzite Pebble (or Quartz Pebble)
Quartzite (SiO2)
metamorphic
Petrified Wood / Jasper Chert
Silicified Wood / Microcrystalline Quartz (SiO2)
sedimentary
Amygdaloidal Basalt
Amygdaloidal Basalt (containing quartz/agate or zeolite fill)
igneous
Banded Sedimentary Rock (Siltstone/Mudstone with concretion)
Siltstone with Ferruginous Banding
sedimentary