Yellow Quartz (Polished)
Silicon Dioxide (SiO2) with iron inclusions
mineral
Category
Synthetic Or Natural Fiber
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Ironstone Concretion / Limonite Node
Limonite (Hydrated Iron Oxide, FeO(OH)·nH2O) with Goethite/Hematite
sedimentary
Clear Quartz
Silicon Dioxide (SiO2)
mineral
Amethyst
Amethyst (Silicon Dioxide, SiO2)
mineral
Corundum (Sapphire and Ruby)
Aluminum Oxide (Al2O3)
mineral
Turquoise (Dyed Howlite or Magnesite imitation)
Hydrated phosphate of copper and aluminum / CuAl6(PO4)4(OH)8·4H2O
mineral
Glass / Silicon Dioxide (Man-made)
SiO2 (Amorphous Silicon Dioxide)
Amorphous Solid
Granite (Background) and Quartzite/River Pebble (Foreground Heart)
Phaneritic Felsic Igneous Rock (Granite background)
igneous
Green Aventurine
Silicon Dioxide (Quartz with Fuchsite inclusions), SiO2 + K(Al,Cr)2AlSi3O10(OH)2
mineral
Quartz (likely Herkimer Diamond style)
Silicon Dioxide (SiO2)
mineral
White Agate (Tumbled)
Silicon Dioxide (SiO2) - Cryptocrystalline Chalcedony
mineral
Clear Quartz Crystal
Silicon Dioxide (SiO2)
mineral
Blue Sapphire
Corundum (Al2O3 with iron and titanium trace elements)
mineral
Amygdaloidal Rhyolite
Rhyolite (felsic volcanic rock) with amygdules
igneous
Mahogany Obsidian
Obsidian (Volcanic Glass) with Hematite or Magnetite inclusions, SiO2 (Silicon Dioxide)
igneous
Citrine Quartz
Citrine (Silicon Dioxide - SiO2)
Mineral
Gneiss
Gneiss (High-grade Regional Metamorphic Rock)
metamorphic
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Diamond (Cluster Setting)
Carbon (C) - Diamond
mineral
Aventurine
Aventurine Quartz (SiO2 with inclusions)
metamorphic
Quartz
Silicon Dioxide (SiO2)
mineral
Turquoise
Hydrated phosphate of copper and aluminium: CuAl6(PO4)4(OH)8·4H2O
mineral
Jasper Marble
Silicon Dioxide (SiO2) with Impurities
sedimentary
Granite
Phaneritic Felsic Igneous Rock
igneous
Black Tourmaline
Schorl (NaFe3Al6(BO3)3Si6O18(OH)4)
mineral
Asphalt (Bituminous Concrete)
Asphaltum / Bitumen-Aggregate Matrix
Technonatural composite (often containing sedimentary/igneous aggregate)
Granite
Phaneritic Felsic Igneous Rock
igneous
Granite
Granite
igneous
Limestone (Porous/Travertine variant)
Sedimentary Calcium Carbonate (CaCO3)
sedimentary
Chalk (Limestone)
Calcium Carbonate (CaCO3)
sedimentary
Magnetite
Magnetite (Fe3O4)
Mineral
Diamond
Diamond (carbon allotrope), C (chemical formula)
Mineral
Diamond (Rough)
Diamond (C)
Mineral
Pebble (likely Quartzite or Chert)
Clastic Sediment, potentially composed of SiO₂ (Quartz)
Mineral, Sediment
Chert (Flint)
Silicon Dioxide (SiO2) - Microcrystalline Quartz
sedimentary
Petoskey Stone
Hexagonaria percarinata
sedimentary
Black Opal
Hydrated Silica (SiO2·nH2O)
mineral
Blue Sapphire
Corundum (Al2O3)
mineral
Diamond
Carbon (C)
Mineral
Basalt with Quartz Vein
Basalt (SiO2 vein inclusion)
igneous
Clear Quartz (Rock Crystal)
Silicon Dioxide (SiO2)
mineral
Shale or Argillite
Shale (sedimentary) / Argillite (metamorphic)
Sedimentary or Metamorphic (low-grade)