Specular Hematite
Specularite (Iron Oxide, Fe2O3)
mineral
Category
Man Made Alloy (Metallic)
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Hematite
Ferric Oxide (Fe2O3)
mineral
Pyrite (on the right) and Magnetite or Hematite (on the left)
Iron Sulfide (FeS2) and Iron Oxide (Fe3O4 or Fe2O3)
mineral
Granite
Granite (Plutonic Igneous Rock)
igneous
Sandstone (Quartzose)
Arenite (primarily SiO2)
sedimentary
Granite
Granite (Silicic Intrusive Igneous Rock)
Igneous
Granite
Granite (Felsic Plutonic Rock)
igneous
Granite
Granite (phaneritic intrusive igneous rock consisting of quartz, feldspar, and mica)
igneous
Granite
Granite (a plutonic rock)
Igneous
Sandstone
Arenite
sedimentary
Sandstone
Arenite
sedimentary
Sandstone
Arenite (mostly SiO2)
sedimentary
Sandstone
Arenite (SiO2 primarily)
sedimentary
Sandstone (Quartzose)
Arenite (primarily SiO2)
sedimentary
Granite
Granite (Mainly Quartz SiO2, Feldspar KAlSi3O8, and Mica KAl2(AlSi3O10)(OH)2)
Igneous
Fulgarite
Fulgurite (Lechatelierite / Vitrified Sand)
igneous
Specular Hematite (Specularite)
Iron Oxide (Fe2O3)
mineral
Hematite
Iron Oxide (Fe2O3)
mineral
Coquina
Biogenic Limestone (Calcium Carbonate, CaCO3)
sedimentary
Chalk
Carbonate rock (mainly CaCO3)
sedimentary
Chert
Microcrystalline Quartz (SiO2)
sedimentary
Chert / Flint
Silicon Dioxide (Microcrystalline Quartz, SiO2)
sedimentary
Green Quartzite
Metamorphic Quartzite (often colored by chromium-bearing minerals or fuchsite)
metamorphic
Quartzite
Metamorphic Quartzite (SiO2)
metamorphic
Flint / Chert
Microcrystalline quartz (SiO2)
sedimentary
Diamond
Carbon (C)
mineral
Diamond
Carbon (C)
gemstone
Chert
Microcrystalline Quartz (SiO2)
sedimentary
Banded Jasper / Chert Beach Pebble
Microcrystalline Quartz (SiO2)
sedimentary
Chert (Siltstone / Flint)
SiO2 (Cryptocrystalline Quartz)
sedimentary
Chert (Flint)
Silicon Dioxide (SiO2)
sedimentary
Brecciated Jasper
Silicon Dioxide (SiO2) with iron oxide inclusions
sedimentary
Pearl and Garnet Glass
Calcium Carbonate (CaCO3) for pearl; Silicon Dioxide (SiO2) for glass
mineral and glass
Smoky Quartz
Smoky Quartz (SiO2)
mineral
Pearl
Organic gemstone (Calcium carbonate - CaCO3)
mineral
Pearl
Calcium carbonate (CaCO3) - mainly Aragonite with Conchiolin
mineraloid
Chert (specifically Flint or Nodular Chert)
Silicon dioxide (SiO2)
sedimentary
Sandstone
Arenite (composed primarily of SiO2)
sedimentary
Diamond (in a jewelry setting)
Cubic Carbon (C)
mineral
Obsidian
Volcanic Glass (SiO2)
igneous
Chert (Jasper/Flint var.)
Silicon Dioxide (SiO2)
sedimentary
Granodiorite
Granodiorite (phaneritic intrusive igneous rock)
igneous