Agate (Dyed High-Grade Polished Slice)
Silicon dioxide (SiO2), Chalcedony crystal variety
mineral
Category
Sedimentary (Primary) With Artificial Modification
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Dyed Agate (Dragon Vein Agate Bead)
Silicon dioxide (SiO2) variety Chalcedony
gemstone
Coal
Biogenic sedimentary rock (Carbon)
sedimentary
Dyed Pink Quartzite
Tumbled and Dyed Quartzite (SiO2 with dye treatment)
metamorphic
Cobalt Blue Slag Glass
Amorphous Silicon Dioxide (anthropogenic) with Cobalt additives
mineraloid
Quartz Pebble
Silicon Dioxide (SiO2)
sedimentary
Sandstone (Quartzite-rich)
Clastic sedimentary rock (SiO2 primary)
sedimentary
Quartz (Milky/Common)
Silicon Dioxide (SiO2)
mineral
Dyed Blue Agate
Chalcedony (Silicon Dioxide / SiO2)
mineral
Blue Quartzite (Dyed Quartzite)
Silicon Dioxide (SiO2) with dye
metamorphic
Iridescent red crystal cluster, likely aura-coated quartz
Quartz (SiO₂), possibly metal-coated; exact identification is uncertain from the photo
mineral
Dyed Tumbled Quartz
Silicon Dioxide (SiO2)
mineral
Citrine
Silicon Dioxide (SiO2)
mineral
Quartz (Citrine variety)
Silicon Dioxide (SiO2)
mineral
Dyed Agate
SiO2
mineral
Quartz Grain
Silicon Dioxide (SiO2)
mineral
Sandstone
Arenite (SiO2 primarily)
sedimentary
Polished carnelian (likely)
Carnelian, orange-red chalcedony; microcrystalline quartz (SiO₂)
gemstone
Limestone (with possible Manganese oxide inclusions)
Sedimentary Calcium Carbonate (CaCO3)
sedimentary
Shale
Laminated Mudstone (Shale)
sedimentary
Dyed Agate Geode (Pink/Magenta)
Silicon Dioxide (SiO2) - variety of Chalcedony/Quartz
mineral
Terrazzo (Man-made Composite)
Cementitious or Resin-bound Lithic Composite
sedimentary (artificial)
Blue Apatite
Calcium phosphate fluorapatite, Ca5(PO4)3(F,Cl,OH)
mineral
Calcite
Calcium Carbonate (CaCO3)
mineral
Tumbled chalcedony or quartz pebble
Microcrystalline quartz, SiO₂ (likely chalcedony); exact identification is uncertain from the image
mineral
Mixed mineral specimens, prominently chalcopyrite and amethyst
Chalcopyrite (CuFeS₂) with secondary copper minerals; amethyst, purple quartz (SiO₂)
mineral
Botryoidal Calcite
Calcium Carbonate (CaCO3)
mineral
Carnelian (a variety of Chalcedony)
Cryptocrystalline Quartz (SiO2) with iron oxide inclusions
Mineral
Dyed Agate
SiO2 (Silicon Dioxide)
Mineral
Lemon Quartz (Orizaba/Citrinated Quartz)
Silicon Dioxide (SiO2) with iron impurities/treatment
mineral
Quartz pebble
Silicon dioxide (SiO2)
sedimentary
Hematite
Iron(III) oxide (Fe2O3)
mineral
Dyed Quartzite (Pink/Magenta)
Silicon Dioxide (SiO2) - Artificially Colored Quartzite
mineral
Likely tumbled jasper or agate
Microcrystalline quartz (SiO₂), possibly iron-rich jasper
mineral
Turquoise
CuAl6(PO4)4(OH)8·4H2O
mineral
Polished blue lace agate slice
Chalcedony (microcrystalline quartz), SiO₂, commonly with blue-gray banding and a druzy quartz center
mineral
Pink Banded Agate (Dyed)
Chalcedony (cryptocrystalline silica), chemical formula SiO2
mineral
Calcite Vein on Limestone
Calcium Carbonate (CaCO3)
sedimentary
Specular Hematite with Quartz and Limonite
Hematite (Fe2O3) with Quartz (SiO2) and Limonite (FeO(OH)·nH2O)
Mineral
Sedimentary Outcrop (Sandstone/Shale)
Sedimentary bedrock formation (variable composition)
sedimentary
Sandstone (Ferruginous)
Arenite (Fe-rich)
sedimentary
Quartz pebble
Silicon dioxide (SiO2)
sedimentary