Banded Igneous Dike Rock
Intrusive igneous rock with felsic/mafic banding
igneous
Category
Not A Geological Specimen
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Cowrie Shell Fossil
Cypraea sp.
fossil
Quartz Vein in Basalt or Porphyry
Silicate-veined volcanic rock
igneous
Chert (within Limestone matrix)
Silicon Dioxide (SiO2) within Calcium Carbonate (CaCO3)
sedimentary
Chert Nodule in Limestone
Silicon Dioxide (SiO2) in Calcium Carbonate (CaCO3)
sedimentary
Quartz Geode
Silicon Dioxide (SiO2)
mineral
Quartz with Metallic Inclusion
Silicon Dioxide (SiO2) with associated metallic sulfide or oxide
mineral
Fossiliferous Chert or Limestone
Sedimentary rock containing fossilized marine invertebrates (likely crinoid stems or bryozoans)
sedimentary
Komatiite Drill Core
Ultramafic Volcanic Rock (Spinifex Texture)
igneous
Sandstone with Concretions / Liesegang Rings
Arenite with iron oxide banding
sedimentary
Sandstone
Arenite (SiO2 based)
sedimentary
Gossan (with Limonite and Hematite)
Gossanous iron-oxide rock (Fe2O3 · nH2O)
sedimentary
Quartz Mineral
Silicon Dioxide (SiO2)
mineral
Quartz (Smoky/Milky variety)
Silicon Dioxide (SiO2)
mineral
Man-made Polished Porcelain Tile (Artificial Geologic Lookalike)
Fused Silicate Ceramic with Alumina (Synthetic Kaolinite derivative)
Synthetic (Ceramic)
Agate Geode with Quartz
Silicon Dioxide (SiO2)
mineral
Clear Quartz
Silicon Dioxide (SiO2)
mineral
Quartz geode or druzy quartz specimen
Quartz, silicon dioxide (SiO₂), likely microcrystalline/drusy quartz coating a host rock
mineral
Gabbro or Diorite with Felsic intrusion
Mafic to intermediate intrusive igneous rock with felsic vein/inclusion
igneous
Borosilicate Glass (Manufactured)
SiO2 + B2O3 (Silicon dioxide and Boron trioxide)
Synthetic/Amorphous Solid
Quartz
Silicon Dioxide (SiO2)
mineral
Quartz Druzy on Matrix
SiO2
mineral
Ferruginous Sandstone (Gozzan)
Iron-rich clastic sedimentary rock with Limonite/Goethite
sedimentary
Sandstone
Arenite (SiO2 primarily)
sedimentary
Uncertain polished mineral specimen
Indeterminate; possibly quartz or feldspar with iron-oxide staining
mineral
Brecciated Quartzite
Brecciated Quartzite
Metamorphic
Quartz with inclusions
Silicon Dioxide (SiO2)
mineral
Iron-Stained Quartz
Silicon Dioxide with Iron Oxide (SiO2 with Fe2O3)
mineral
Almandine Garnet
Almandine (Fe3Al2Si3O12)
mineral
Quartz pebble
Silicon dioxide (SiO2)
sedimentary
Clear Quartz Crystal
Silicon Dioxide (SiO2)
mineral
Clear Quartz
Silicon Dioxide (SiO2)
mineral
Unidentifiable blurred specimen
Cannot be determined from the image
mineral
Small pale rock fragment
Indeterminate; possibly quartz, calcite, or a weathered feldspar-rich fragment
mineral
Gowganda Tillite (Puddingstone)
Gowganda Formation Conglomerate
sedimentary
Quartz Crystal Cluster
Silicon Dioxide (SiO2)
mineral
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Pitted Limestone
Calcium Carbonate (CaCO3)
sedimentary
Weathered porphyritic volcanic rock
Likely andesite or dacite, with feldspar phenocrysts in a fine-grained groundmass
igneous
Flint in Limestone (Chert Nodule)
Sedimentary rock containing microcrystalline quartz (SiO2) within a carbonate matrix
sedimentary
Cone-in-cone structure
Cone-in-cone structure
sedimentary
Corundum (Sapphire in Matrix)
Aluminum Oxide (Al2O3)
mineral