Chert (Flint)
Silicon Dioxide (SiO2)
sedimentary
Category
Antropogenic (Man Made Material)
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Chert (Flint)
Silicon Dioxide (SiO2)
sedimentary
Red Jasper
Silicon Dioxide (SiO2) with Hematite (Fe2O3)
sedimentary
Obsidian
Obsidian (volcanic glass, amorphous silica rich rock)
Igneous
Quartzite
Metamorphic Quartzite (SiO2)
metamorphic
Quartzite
Metamorphic Quartzite (SiO2)
metamorphic
Quartzite
Quartzite (Metamorphosed Sandstone)
metamorphic
Chert
Microcrystalline quartz (SiO2)
sedimentary
Quartzite
Metamorphic Quartz Rock (SiO2)
metamorphic
Quartzite
Metamorphic Quartz Arenite
metamorphic
Sandstone
Arenite
sedimentary
Flint
Silicon dioxide (Microcrystalline Quartz / Chert)
sedimentary
Chert (or Flint)
Microcrystalline quartz (SiO2)
sedimentary
Red Quartzite
Quartzite (SiO2)
metamorphic
Chert (Flint)
Silicon Dioxide (SiO2)
sedimentary
Chert Arrowhead (Jasper)
Chert (Cryptocrystalline Quartz, SiO2)
sedimentary
Diamond (faceted)
Diamond (Pure Carbon, C)
mineral
Pearl
Aragonite (CaCO3) with Conchiolin
mineral
Aragonite
Aragonite (Calcium Carbonate - CaCO3)
mineral
Granite
Phaneritic plutonic felsic rock
igneous
Dark gray rounded stone, possibly basalt or slag
Uncertain; likely fine-grained basalt (plagioclase–pyroxene) or iron-rich industrial slag
igneous
Aura Quartz (Anomalously Coated Quartz)
Silicon Dioxide (SiO2) treated with vaporized metals
mineral
Sandstone
Clastic Sedimentary Rock
sedimentary
Chert
Chert (microcrystalline quartz)
sedimentary
Orgonite Pyramid (containing Amethyst and mixed minerals)
Silicon Dioxide (SiO2) in synthetic resin
gemstone
Quartz Sandstone Pebble
Sandstone (SiO2 dominated)
sedimentary
Mica Schist
Mica Schist (principally Biotite/Muscovite, Quartz, and Feldspar)
metamorphic
Coquina
Bioclastic Limestone (composed primarily of CaCO3)
sedimentary
Corundum (Sapphire variant)
Aluminium oxide (Al2O3)
mineral
Limestone Pebble
Sedimentary Calcium Carbonate (CaCO3)
sedimentary
Chalcedony (Agate/Chert variety)
Silicon Dioxide (SiO2)
mineral
Granite
Felsic intrusive igneous rock
igneous
Pink Granite (Alkali-feldspar Granite)
Felsic intrusive igneous rock (composition: KAlSi3O8, SiO2, NaAlSi3O8)
igneous
Sandstone (Ferruginous)
Arenite (SiO2 with Fe2O3 inclusions)
sedimentary
Sandstone
Arenite (SiO2 based)
sedimentary
Precious Coral (Red Coral)
Corallium rubrum (Calcium Carbonate, CaCO3)
mineral
Diamond
C (Carbon)
gemstone
Coal (Bituminous Coal)
Caustobiolith / Sedimentary Rock
sedimentary
Chrysocolla
Hydrated copper phyllosilicate, (Cu,Al)2H2Si2O5(OH)4·nH2O
mineral
Yellow Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Seven Chakra Bonded Stone
Bonded composite of Red Jasper, Carnelian, Tiger's Eye, Aventurine, Lapis Lazuli, Amethyst, and Clear Quartz
metamorphic
Banded Gneiss
Gneiss (Foliated Metamorphic Rock)
metamorphic