Chalk
Carbonate rock (mainly CaCO3)
sedimentary
Category
Antropogenic (Man Made)
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Diamond (in Jewelry)
Carbon (C)
mineral
Pearl
Aragonite / Calcium Carbonate (CaCO3)
mineraloid
Sandstone
Arenite (SiO2 composition dominant)
sedimentary
Red gemstone ring, likely garnet or synthetic ruby
Possibly almandine garnet (Fe₃Al₂(SiO₄)₃) or corundum/ruby (Al₂O₃); image alone cannot distinguish
gemstone
Quartzite
Metamorphic Quartzite (SiO2)
metamorphic
Diamond
Native Carbon (C)
gemstone
Chert (Flint)
Silicon Dioxide (SiO2)
sedimentary
Diamond
Carbon (C)
mineral
Sandstone
Arenite (composed primarily of SiO2)
sedimentary
Chalk
Micrite (primarily Calcium Carbonate or CaCO3)
sedimentary
Pearl
Organic gemstone (Calcium carbonate - CaCO3)
mineral
Chert (variations include Flint)
Microcrystalline or cryptocrystalline Quartz (SiO2)
sedimentary
Diamond
Carbon (C)
mineral
Diamond
Carbon (C)
gemstone
Sandstone
Arenite (SiO2, often with CaCO3 or Fe2O3 cement)
sedimentary
Quartzite
Metamorphic Quartzite (SiO2)
metamorphic
Diamond
Diamond (pure carbon C)
mineral
Red Quartzite
Quartzite (Metamorphosed Quartz Arenite)
metamorphic
Quartzite
Metamorphic Quartz Rock (SiO2)
metamorphic
Quartzite
Metamorphic Quartzite (SiO2)
metamorphic
Sandstone (Quartzose)
Arenite (primarily SiO2)
sedimentary
Sandstone (Quartzose)
Sandstone (SiO2 dominated)
sedimentary
Quartzite
Metamorphic Quartzite (SiO2)
metamorphic
Quartzite
Metamorphic Quartzite (SiO2)
metamorphic
Quartzite
Metamorphic Quartzite (primarily SiO2)
metamorphic
Quartzite
Metamorphic Quartzite (primarily SiO2)
metamorphic
Sandstone
Arenite
sedimentary
Coal (Bituminous Coal)
Caustobiolith / Sedimentary Rock
sedimentary
Vesicular volcanic rock, likely weathered pumice or scoria
Pumice/scoria; predominantly volcanic glass and feldspar, with possible iron oxides
igneous
Sandstone
Arenite (primarily SiO2)
sedimentary
Diamond
Carbon (C)
gemstone
Sandstone
Clastic Sedimentary Rock
sedimentary
Quartzite
Metamorphic Quartzite
metamorphic
Diamond
Diamond (pure Carbon, C)
mineral
Chert (varietal: Flint/Jasper)
Silicon Dioxide (SiO2)
sedimentary
Fossilized Shell in Limestone
Biogenic Limestone (Calcium Carbonate, CaCO3)
sedimentary
Sandstone (Quartzose)
Arenite (primarily SiO2)
sedimentary
Diamond (or Diamond Simulant)
Carbon (C) or Cubic Zirconia (ZrO2)
gemstone
Diamond (or Cubic Zirconia)
Carbon (C) or Zirconium Dioxide (ZrO2)
gemstone
Diamond in Kimberlite
Diamond in Kimberlite Matrix (Diamond: C, Kimberlite: complex Potassic Peridotite)
igneous
Basalt
Basalt
igneous