Chert (often called Flint or Jasper)
Silicon Dioxide (SiO2)
sedimentary
Category
Anthropogenic (Man Made Material)
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Polished mahogany obsidian (likely)
Volcanic glass; primarily silica-rich rhyolitic glass (SiO₂), with iron oxides
igneous
Red synthetic corundum (ruby-colored lab-grown sapphire)
Corundum, aluminum oxide (Al₂O₃), likely synthetic and chromium-colored
gemstone
Sandstone (Ferruginous)
Sandstone (primarily SiO2 with Iron Oxide cement)
sedimentary
Pink quartz-rich stone, likely rose quartz
Rose quartz; quartz, SiO₂, commonly colored by trace elements and microscopic inclusions
mineral
Iron Slag
Vitreous glassy waste (Fe-Si-Al-Ca compounds)
Mineral byproduct (anthropogenic / techno-fossil)
Sandstone (Quartzose)
Arenite (primarily SiO2)
sedimentary
Sandstone (Ferruginous)
Arenite (with Iron Oxides)
sedimentary
White quartz pebble
Quartz (silicon dioxide, SiO₂)
mineral
Purple fluorite (likely cubic crystal aggregate)
Fluorite, calcium fluoride (CaF₂)
mineral
Clear Quartz (Faceted) or Cubic Zirconia / Glass imitation
SiO2 (if Quartz), ZrO2 (if Cubic Zirconia)
mineral
Slate
Slate (Regional metamorphic rock composed primarily of quartz, illite, and chlorite)
metamorphic
Polished orbicular jasper (likely ocean jasper)
Jasper, microcrystalline quartz (SiO₂), colored by iron oxides and other inclusions
mineral
Tumbled pink chalcedony (likely pink agate/jasper)
Microcrystalline quartz, SiO₂, with iron-oxide coloring
mineral
Polished green stone, likely serpentine or altered basalt
Serpentine-group minerals, chiefly Mg₃Si₂O₅(OH)₄; exact identification requires testing
metamorphic
Jasper
Microcrystalline Quartz (SiO2)
sedimentary
Petrified Wood
Silicified wood / Permineralized wood (SiO2)
fossil
Mammoth or Mastodon Tooth Fossil
Mammuthus / Mammut tooth
fossil
Jasper
Microcrystalline Quartz (SiO2)
sedimentary
Petrified Wood
Silicified wood (Quartz replacement, SiO2)
fossil
Jasper
Microcrystalline quartz (SiO2)
sedimentary
Shark Tooth Fossil
Vertebrate fossilized tooth (Chondrichthyes)
fossil
Shark Tooth Fossil
Vertebrate fossilized tooth
fossil
Fossilized Bone
Permineralized Vertebrate Bone
fossil
Jasper
Microcrystalline Quartz (SiO2)
sedimentary
Jasper
Microcrystalline quartz (SiO2)
sedimentary
Fulgurite
Lechatelierite (vitreous silica)
mineral
Jasper
Silicon Dioxide (SiO2) microcrystalline quartz
sedimentary
Petrified Wood
Silicified wood (SiO2)
fossil
Fossilized Brachiopod
Brachiopoda (Phylum)
fossil
Chert (Flint)
Microcrystalline Quartz (SiO2)
sedimentary
Quartz with Mica Schist
Quartz-Mica Schist / Pegmatitic Quartz
metamorphic
Petrified Wood
Silicified Wood (SiO2)
fossil
Brown Chert
Cryptocrystalline Quartz (SiO2)
sedimentary
Chert (Common Opal or Agate)
Microcrystalline Quartz (SiO2)
sedimentary
Green Fluorite
Calcium Fluoride (CaF2)
mineral
Chert (Flint Nodules)
Microcrystalline Quartz (SiO2)
sedimentary
Chert (Common Opal/Agatized Rock)
Microcrystalline Quartz (SiO2) with potential Chalcedony/Opaline silica
sedimentary
Red Jasper
Silicate (SiO2 with Hematite inclusions)
sedimentary
Chert Nodules (with Quartz Inclusions)
Microcrystalline Quartz (SiO2)
sedimentary
Rose Quartz
SiO2 (Silicon Dioxide)
mineral
Yellow Jasper
Silicon Dioxide (SiO2) with hydrated iron oxide impurities (Goethite)
sedimentary