Chert (containing Quartz)
Microcrystalline Silica (SiO2)
sedimentary
Category
Man Made Material (Jewelry, Metal Alloy)
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Chert (Commonly known as Flint)
Microcrystalline Quartz (SiO2)
sedimentary
Quartz (Milky or White Quartz)
Silicon Dioxide (SiO2)
mineral
Epidote with Unakite characteristics
{Ca2}{Al2Fe3+}(Si2O7)(SiO4)O(OH)
metamorphic
Chert (often called Flint or Jasper)
Silicon Dioxide (SiO2)
sedimentary
Septarian Nodule
Septarian Concretion (Complex of Calcite, Aragonite, and Limestone/Mudstone)
sedimentary
Aragonite Star Cluster
Aragonite (Calcium Carbonate, CaCO3)
mineral
Banded Onyx (Cave Calcite)
Calcite (CaCO3), often called Mexican Onyx or Travertine
sedimentary
Chert (also known as Flint or Common Chalcedony)
Cryptocrystalline Silica (SiO2)
sedimentary
Rough Aquamarine
Beryl (Be₃Al₂Si₆O‑₁•H₂O)
Mineral
Siltstone
Siltstone (primarily composed of SiO2)
sedimentary
Petrified Wood
Silicified Wood (SiO2)
fossil
Obsidian
Volcanic Glass (Primary composition: SiO2 - Silicon Dioxide)
igneous
Coral (Precious Coral)
Corallium rubrum (Red Coral), Paracorallium japonicum (Momo Coral), Pleurocorallium elatius (Sardinian Coral), various other species within the Corallidae family. Chemically, it's primarily Calcium Carbonate (CaCO 3 ).
Mineral, Organic Gemstone
Chert (often called Jasper or River Pebble)
Microcrystalline Quartz (SiO2)
sedimentary
Petrified Wood
Silicified Wood (SiO2)
sedimentary
Chert (Yellow Jasper/Honey Chert)
Silicon Dioxide (SiO2)
sedimentary
Amber
Succinite (approximate formula C10H16O)
mineral
Yellow Jasper
Silicon Dioxide (SiO2) - variety of Chalcedony
sedimentary
Diamond (or Diamond Simulant)
Carbon (C) - Native Element
mineral
Chert (Flint nodules in limestone)
Silicon Dioxide (SiO2)
sedimentary
Flint (Chert)
Cryptocrystalline Quartz (SiO2)
sedimentary
Raw Diamond
Diamond (pure Carbon, C)
mineral
Quartz (worked as a tool or artifact)
Silicon Dioxide (SiO2)
mineral
Chert (Flint)
Chert (Silicon Dioxide, SiO2)
sedimentary
Jasper (Green)
Silicon dioxide (SiO2)
Mineral/Sedimentary
Hypersthene
Hypersthene (Enstatite variety), (Mg,Fe)SiO3
Mineral
Diamond (Princess Cut Gemstone)
Carbon (C)
mineral
Agate
Silicon Dioxide (Chalcedony), SiO2
sedimentary
Chert (Yellow Jasper/Flint)
Microcrystalline quartz (SiO2)
sedimentary
Quartz (Milky or Clear variety)
Silicon Dioxide (SiO2)
mineral
Diamond (Rough)
Carbon (C)
gemstone
Chert (Flint)
Silicon Dioxide (SiO2)
sedimentary
Yellow Jasper
Silicon Dioxide (SiO2)
sedimentary
Kyanite (Blue and Green varieties)
Kyanite (Al₂SiO₅)
mineral
Clear quartz crystal sphere
Quartz (silicon dioxide, SiO₂)
mineral
Sand Tiger Shark Tooth Fossil
Carcharias taurus (fossilized tooth)
fossil
Chalcedony (Chert/Flint variety)
Silicon Dioxide (SiO2)
sedimentary
Petrified Wood
Silicified Wood (SiO2 / Quartz pseudomorph after wood)
fossil
Chert (variations include Flint/Jasper)
Cryptocrystalline Silicon Dioxide (SiO2)
sedimentary
Green aventurine (likely)
Quartz variety; silicon dioxide (SiO₂) with green fuchsite mica inclusions
mineral
White quartz pebble
Quartz (SiO₂), likely milky quartz
mineral