Belemnoit Fossil (Sea Squid Fossil)
Belemnitida (Order within Cephalopoda)
sedimentary
Category
Not A Geological Specimen
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Petrified Wood
Silicified Wood (SiO2)
mineral
Petrified Wood
Silicified Wood (SiO2)
sedimentary
Druzy Quartz on Host Rock
Silicon Dioxide (SiO2)
mineral
Black Obsidian (Faceted)
Volcanic Glass (Amorphous Silicon Dioxide)
igneous
Quartzite Pebble
Metamorphosed Quartz (SiO2)
metamorphic
Red Sandstone
Arenite with Hematite (Fe2O3)
sedimentary
Quartzite
Metamorphosed Quartz Sandstone (SiO2)
metamorphic
White Jade / Jadeite
NaAlSi2O6 (Sodium Aluminum Silicate)
metamorphic
Basalt
Aphanitic Mafic Igneous Rock
igneous
Sandstone (Ferruginous)
Arenite (primarily SiO2 with Fe2O3 cement)
sedimentary
Sandstone (Greywacke/Siltstone variant)
Arenite / Wacke (SiO2 with diverse mineral inclusions)
sedimentary
Labradorite
Labradorite ((Ca, Na)(Al, Si)4O8)
mineral
Pink Quartz (Rose Quartz variant)
Silicon Dioxide (SiO2)
mineral
Red Cubic Zirconia (Simulated Garnet)
Zirconium Dioxide (ZrO2)
mineral
Granite
Granite (Felsic Plutonic Rock)
igneous
Garnet Schist
Garnetiferous Mica Schist
metamorphic
Quartz Geode
Crystalline Silicon Dioxide (SiO2) in a Geode
mineral
Chert (including Common Opal and Chalcedony)
Silicon Dioxide (SiO2 · nH2O)
sedimentary
Yellow Quartz (Chalcedony/Citrine Pebble)
Silicon Dioxide (SiO2)
mineral
Amethyst (Tumbled Quarz)
Silicon Dioxide (SiO2) with iron impurities
mineral
Iron Concretion
Ferruginous concretion (Fe2O3·nH2O / FeO(OH))
sedimentary
Ironstone Concretion
Siderite or Hematite Concretion (FeCO3 or Fe2O3)
sedimentary
Aura Quartz / Rainbow Aura Quartz
Silicon Dioxide (SiO2) with metallic vapor coating
mineral
Fluorite (specifically Rainbow Fluorite or Purple Fluorite)
Calcium Fluoride (CaF2)
mineral
Fossil Belemnite Guard
Belemnitida (Order), often Hibolites or Neohibolites spp.
fossil
Pyrite (Limonite Pseudo-morph after Pyrite)
Iron sulfide (FeS2) transitioning to Iron oxide-hydroxide (FeO(OH)·nH2O)
mineral
Petrified Wood
Silicified Wood (SiO2)
mineral
Vesicular Basalt with Pyrite
Basalt (MgFe2+)(Si,Al)2O6 containing FeS2 inclusions
igneous
Piddock-bored Mudstone
Lutite (Siltstone or Mudstone) with Pholad borings
sedimentary
Mica Schist (Garnetiferous)
Garnet-Mica Schist
metamorphic
Petrified Wood
Silicified wood (primarily Silicon Dioxide, SiO2)
sedimentary
Aragonite Star Cluster
Aragonite (Calcium Carbonate, CaCO3)
mineral
Pink Granite
Phaneritic Quartz-Feldspar Granite
igneous
Ammonite Fossil
Ammonoidea (subclass)
sedimentary
Almandine Garnet
Almandine (Fe3Al2(SiO4)3)
mineral
Moqui Marble (Concretion)
Iron Oxide Concretion (Hematite-cemented Sandstone)
sedimentary
Sandstone Concretion
Moqui Marble / Iron-oxide Concretion (SiO2 with Hematite/Goethite)
sedimentary
Quartz Geode
Silicon Dioxide (SiO2)
mineral
Quartz Geode
Silicon Dioxide (SiO2)
mineral
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Quartz (Clear Quartz and Rose Quartz variants)
Silicon Dioxide (SiO2)
mineral