Chert with Limestone
Silicon Dioxide (SiO2) in Calcium Carbonate (CaCO3) Matrix
sedimentary
Category
Anthropogenic (Man Made Industrial Byproduct)
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Diamond (faceted)
Diamond (Pure Carbon, C)
mineral
Tumbled amber-colored chalcedony or jasper
Microcrystalline quartz (SiO₂), likely iron-stained chalcedony/jasper
mineral
Green Glass Cullet / Recycled Glass
Amorphous Silicon Dioxide (SiO2) with various metal oxides
Man-made Glass (Not a natural rock or mineral)
Pink calcite (likely)
Calcite — calcium carbonate, CaCO₃
mineral
Sandstone
Arenite (composed primarily of SiO2)
sedimentary
Chert (Flint)
Microcrystalline Quartz (SiO2)
sedimentary
Chert (Nodule)
Chert (Alpha-Quartz, SiO2)
sedimentary
Diamond
Carbon (C)
gemstone
Diamond
Carbon (C)
mineral
Diamond (in a jewelry setting)
Cubic Carbon (C)
mineral
Quartzite Pebble
Quartzite (SiO2)
metamorphic
Basalt
Basalt (containing plagioclase, pyroxene, and olivine)
igneous
Smoky Quartz
Smoky Quartz (Silicon Dioxide, SiO2)
mineral
Blue goldstone beads
Man-made aventurine glass (silica glass with metallic copper inclusions), not natural lapis lazuli
mineral
Chert (and associated river cobbles)
Silicon dioxide (SiO2)
sedimentary
Sandstone (Red/Brown Variety)
Arenite (composed primarily of SiO2 with Fe2O3 iron oxide inclusions)
sedimentary
Diamond
Natural Diamond (Carbon, C)
gemstone
Raw Diamond
Carbon (C)
gemstone
United States Quarter Dollar
Cupronickel Clad Alloy (75% Copper, 25% Nickel over a 100% Copper core)
Metal / Man-made mineral-like object
Goldstone
N/A (Synthetic Glass with Copper Inclusions)
Manufactured Glass
Diamond (Cut Gemstone)
Natural Carbon (C)
gemstone
Diamond
C (Native Carbon)
gemstone
Rough Diamond
Diamond (pure Carbon, C)
mineral
Diamond
Carbon (C)
mineral
Desert Rose (Gypsum)
Gypsum (Calcium Sulfate Dihydrate) - CaSO4·2H2O
mineral
Diamond in Kimberlite
Diamond (C in Kimberlite Matrix)
igneous
Chert (Flint)
Silicon Dioxide (SiO2) - Microcrystalline Quartz
sedimentary
Diamond
Carbon (C)
gemstone
Desert Rose (also known as Sand Rose)
Gypsum (CaSO4·2H2O) or Barite (BaSO4) with sand inclusions
mineral
Green Aventurine
Quartz (SiO2) with Fuchsite inclusions
Mineral
Coal (Anthracite / Bituminous)
Organic Sedimentary Rock (Carbon-based)
sedimentary
Chert (and Flint)
Silicon Dioxide (SiO2)
sedimentary
Diamond
Carbon (C)
gemstone
Malaysian 50 Sen Coin
Coinage (specific alloy unknown without metallurgical analysis, but typically brass or bronze for this denomination and era)
Man-made object (coin)
Diamond (Faceted)
Carbon (C)
gemstone
Chert (specifically Zebra Chert/Flint)
Silicon Dioxide (SiO2)
sedimentary
Sea Glass (Teal/Turquoise)
Amorphous Silica (SiO2) with trace metal oxides
Anthropogenic (Man-made material processed by nature)
Sea Glass (Turquoise/Aqua)
Amorphous Silica (SiO2) with transition metal dopants
Anthropogenic (Man-made material processed by nature)
Desert Rose (Baryte or Gypsum Rose)
Baryte (BaSO4) or Gypsum (CaSO4·2H2O)
mineral
Chert (specifically Gray/Blue-Gray Chert)
Chert (SiO2)
sedimentary
Dyed Quartz (often sold as 'Blue Quartz' or 'Blue Agate')
Silicon Dioxide (SiO2) with artificial pigment
mineral