Quartz with Iron Oxide
Silicon Dioxide (SiO2) with Fe2O3 inclusions
mineral
Category
Mineral Like Biological Tissue
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Sandstone with Iron Staining
Arenite (SiO2 with FeO(OH) impurities)
sedimentary
Red Sandstone
Ferruginous Sandstone (SiO2 with Fe2O3)
sedimentary
Green Druzy Quartz (Prasiolite)
Silicon Dioxide (SiO2) with inclusions (typically Chlorite or Actinolite)
mineral
Black Obsidian
Obsidian (Volcanic Glass), primarily SiO2 (Silicon Dioxide)
igneous
Fluorite
Calcium Fluoride (CaF2)
mineral
Quartz Vein in Schist / Gneiss
Silicon Dioxide (SiO2) in Metamorphic Matrix
igneous
Picture Jasper
Tectonically broken chalcedony (SiO2)
sedimentary
Mica Schist
Mica Schist (Schistose metamorphic rock rich in Muscovite/Biotite)
metamorphic
Yellow Agate (Chalcedony)
Silicon Dioxide (SiO2)
mineral
Smoky Quartz
Silicon Dioxide (SiO₂)
mineral
Carnelian (Orange Chalcedony)
Silicon Dioxide (SiO2)
mineral
Quartzite Pebble (Iron-stained Quartz)
Silicon Dioxide (SiO2) with Iron Oxide (Fe2O3) inclusions
metamorphic
Jasper
Silicon Dioxide (SiO2)
mineral
Malachite in Matrix
Copper Carbonate Hydroxide - Cu2CO3(OH)2
mineral
Dioptase
Dioptase (CuSiO2(OH)2)
mineral
Granite Gneiss
Metamorphic Rock (Quartz, Potassium Feldspar, Plagioclase, Biotite/Amphibole)
metamorphic
Blue Chalcedony Geode (with Quartz Druzy)
Silicon Dioxide (SiO2) - Microcrystalline variety of Quartz
mineral
Petrified Wood
Silicified Wood / Chalcedony (SiO2)
mineral
Banded Slag Glass (Leland Blue/Frankfort Green style)
Anthropogenic Glass Specimen (Amorphous Silicon Dioxide with impurities)
mineral
Quartz pebble
Silicon dioxide (SiO2)
mineral
Smoky Quartz with Amethyst
Silicon Dioxide (SiO2)
mineral
Schist
Mica Schist (Medium-grade metamorphic rock)
metamorphic
Satin Spar Gypsum (Satin Spar Selenite tower)
Gypsum (CaSO4·2H2O)
mineral
Botryoidal Goethite
Goethite (α-Fe3+O(OH))
mineral
Dendritic Agate
Silicon Dioxide with Manganese or Iron Oxide inclusions (SiO2 + Mn/Fe)
mineral
Peacock Ore (Bornite or Iridescent Chalcopyrite)
Bornite (Cu5FeS4) or Acid-treated Chalcopyrite (CuFeS2)
mineral
Quartz Druzy on Matrix
SiO2
mineral
Green Aventurine
Silicon Dioxide (Quartz with Fuchsite inclusions), SiO2
mineral
Sulfur on Aragonite
Sulfur (S) on Aragonite (CaCO3)
mineral
Granite
Granite (Felsic Plutonic Rock)
Igneous
Chert (Septarian Concretion/Nodule)
Microcrystalline silica (SiO2) with carbonate mineral veining
sedimentary
Massive White Quartz
Silicon Dioxide (SiO2)
mineral
Sandstone
Arenite (SiO2 based)
sedimentary
Rutilated Quartz (with Garnet pendant)
Silicon Dioxide (SiO2) with Titanium Dioxide (TiO2) inclusions
mineral
Limonite / Ironstone
Hydrated Iron Oxide (FeO(OH)·nH2O)
mineral
Citrine (Yellow Quartz)
Silicon Dioxide (SiO2)
mineral
Sandstone with Dendritic Manganese Oxides
Sandstone (SiO2 predominant) with Oxide Dendrites (MnO2)
sedimentary
Yellow Jasper / Chert
Silicon Dioxide (SiO2) with Goethite or Limonite inclusions
sedimentary
Native Copper
Native Copper (Cu)
mineral
Amygdaloidal Basalt
Amygdaloidal Basalt (Mafic volcanic rock including secondary mineral infills)
Igneous
Gneiss
Gneiss (high-grade metamorphic rock typically composed of quartz, feldspar, and mica)
metamorphic