Brecciated jasper (likely ocean jasper or red jasper)
Microcrystalline quartz, SiO₂, with iron-oxide pigments and breccia cement
mineral
Category
Synthetic Polymer (Synthetic Material)
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Crushed Granite / Landscaping Gravel
Granitoid
igneous
Concrete Fragment
Artificial Conglomerate (Cement and Aggregate)
sedimentary
Milky Quartz Chip
Silicon Dioxide (SiO2)
mineral
Concrete fragment with Aggregate
Anthropogenic Concrete with Calcarious and Siliceous Aggregate
sedimentary (anthropogenic/man-made)
Petrified Wood
Silicified Wood (SiO2)
sedimentary
Siltstone
Siltstone (primarily SiO2 with various silicates)
sedimentary
Quartzite River Pebble
Quartzite (primarily SiO2)
metamorphic
Milky Quartz
Quartz (Silicon Dioxide, SiO2)
mineral
Chert / Flint
Microcrystalline quartz (SiO2)
sedimentary
Chert (Flint)
Microcrystalline quartz (SiO2)
sedimentary
Chert (Flint)
Microcrystalline Quartz (SiO2)
sedimentary
Chalcedony (Chert/Flint)
Silicon Dioxide (SiO2)
sedimentary
Petrified Wood
Silicified Wood (Silicon Dioxide - SiO2)
fossil
Green Jasper
Silicon Dioxide (SiO2)
sedimentary
Sandstone
Clastic sedimentary rock (Quartz arenite / Arkose)
sedimentary
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Schist
Mica Schist
metamorphic
Limestone or Sandstone Cobble
Sedimentary rock (Calcium carbonate or Quartz based)
sedimentary
Quartz Vein in River Siltstone
Crystalline Quartz (SiO2) in Siliclastic Matrix
sedimentary
Pumice or Scoria
Vesicular volcanic rock
Igneous
Asphalt (Bituminous Rock)
Natural bitumen or Bituminous limestone/sandstone
sedimentary
Diamond
C
gemstone
Diamond (or Diamond Simulant)
Carbon (C) if diamond, various if simulant (e.g., Cubic Zirconia ZrO2)
gemstone
Diamond (or Diamond Simulant)
Carbon (C) if diamond, various if simulant (e.g., Cubic Zirconia ZrO2)
gemstone
Flint
Microcrystalline quartz (SiO2)
sedimentary
Chert (Jasper/Flint variety)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Quartzite
Quartzite
metamorphic
Coquina / Fossiliferous Limestone
Biogenic Limestone (Calcium Carbonate - CaCO3)
sedimentary
Red Sandstone
Arenite (with Iron Oxide cement)
sedimentary
Coquina
Coquina (Bioclastic Limestone)
sedimentary
Diamond (in a gold ring)
Diamond (pure carbon, C)
mineral
Polished kambaba jasper
Orbicular stromatolitic jasper; microcrystalline quartz (SiO₂) with chlorite/amphibole-rich inclusions
sedimentary
Jade (likely Jadeite)
Jadeite (a pyroxene mineral) or Nephrite (a variety of amphibole mineral)
Mineral
Tiffany Stone
Fluorite-bearing Opalized Breccia
Rock/Mineralized Nodule
Chert (Flint)
Sedimentary Cryptocrystalline Quartz (SiO2)
sedimentary
Diamond
C
gemstone
Diamond (or Diamond Simulant like Cubic Zirconia)
Carbon (C) - if Diamond; Zirconium dioxide (ZrO2) - if Cubic Zirconia
mineral
Asphalt Pavement (with aggregate)
Asphalt concrete
man-made composite
Slag Glass
Silicon dioxide with impurities
mineral
Concrete with Aggregate
Artificial Conglomerate (Cement and Aggregate)
sedimentary