Fossiliferous Limestone
Fossiliferous Calcilutite / Biomicrite
sedimentary
Category
Not A Geological Specimen
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Quartz with Mica inclusions (likely Schist or Gneiss host)
Silicon Dioxide (SiO2) with Phyllosilicates (KAl2(AlSi3O10)(OH)2)
metamorphic
Painted River Rock (likely Quartzite or Granite)
Quartzite or Granitic Gneiss (painted)
metamorphic
Basalt with Iron Oxide staining
Basalt (Mafic volcanic rock)
igneous
River Pebble (Quartzite/Chert)
Quartzite with inclusions (SiO2)
metamorphic
Dendritic Agate or Spotted Quartzite
Silicon Dioxide (SiO2) with inclusions
metamorphic
Chert (Jasper variety)
Silicon dioxide (SiO2)
sedimentary
Fossilized Solitary Rugose Coral (Horn Coral)
Order: Rugosa (e.g., Grewingkia or Heliophyllum); composed of Calcite (CaCO3) or Silica (SiO2)
sedimentary
Pyrite in Quartz (Drill Core)
Silicon Dioxide (SiO2) with Iron Sulfide (FeS2) inclusions
igneous/metamorphic (hydrothermal)
Quartz (Milky or Cloudy)
Silicon Dioxide (SiO2)
mineral
Clear Quartz
Silicon Dioxide (SiO2)
mineral
Chert (Flint) with Limestone Matrix
Silicon Dioxide (SiO2) within Calcium Carbonate (CaCO3)
sedimentary
Hand-Drawn Gengar Pokémon Card Artist Item
Lignocellulosic Fiber (Cellulose, C6H10O5) with wax-based pigment (crayon/colored pencil)
Organic (Paper and Cellulose)
Banded River Pebble (Gneiss or Quartz-Veined Basalt)
Polished River Siltstone or Quartzite Gneiss
metamorphic
Jasper Breccia
Silicon Dioxide (SiO2) - Brecciated Microcrystalline Quartz
sedimentary
Phantom Quartz with Chlorite and Hematite inclusions
Silicon Dioxide (SiO2) with inclusions of Chlorite group minerals and Hematite (Fe2O3)
mineral
Citrine Quartz
Silicon Dioxide (SiO2)
mineral
Sandstone with Hematite staining
Arenite with Fe2O3 inclusions
sedimentary
Septarian Nodule
Septarian Concretion (CaCO3 with Siderite/Calcite/Aragonite)
sedimentary
Fulgurite
Lechatelierite (Silica glass), typically SiO2
mineraloid
Limonite/Goethite on Shale
Hydrous ferric oxides (FeO(OH)·nH2O) often associated with argillaceous rock
sedimentary
Ironstone Concretion / Limonite Node
Goethite and Limonite (FeO(OH) nH2O)
sedimentary
Mookaite Jasper
Radiolarite (Silicified radiolarian chert), SiO2
sedimentary
Vesicular Basalt with Amygdules
Amygdaloidal Basalt
igneous
Graphic Granite
Graphic Granite (Granitic Pegmatite), typically KAlSi3O8 (Feldspar) + SiO2 (Quartz)
igneous
Sandstone (Ferruginous)
Arenite (composed primarily of SiO2 with Fe2O3 cement)
sedimentary
Fossil Coral
Scleractinia (fossilized calcium carbonate)
sedimentary
Chalcedony (Agate/Chert variety)
Silicon Dioxide (SiO2)
mineral
Amazonite
Potassium Aluminum Silicate (KAlSi3O8)
mineral
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Chert (Common Opal or Chalcedony)
Microcrystalline Quartz (SiO2)
sedimentary
Quartz Crystal (specifically a milky or semi-translucent single crystal point)
Silicon Dioxide (SiO2)
mineral
Basalt Porphyry
Porphyritic Basalt
igneous
Clear Quartz
Silicon Dioxide (SiO2)
mineral
Banded Onyx
Chalcedony (SiO2)
mineral
Chert Nodule (Flint)
Silicon Dioxide (SiO2)
sedimentary
Banded Agate
Cryptocrystalline Quartz (SiO2)
mineral
Quartz River Pebble (Quartzite)
Metamorphic Quartzite (SiO2)
metamorphic
Quartz (Smoky or Clear variety with inclusions)
Silicon Dioxide (SiO2)
mineral
Fossilized Shark Tooth (Dermal Denticle or worn tooth fragment)
Elasmobranchii (fossil remains)
sedimentary
Quartz / Rock Crystal
Silicon Dioxide (SiO2)
mineral
Mookaite Jasper
Radiolarite (Silicified radiolarian chert)
sedimentary