Chert (Flint)
Chert (Cryptocrystalline silicon dioxide, SiO2)
sedimentary
Category
Industrial Byproduct
Browse industrial byproduct specimens identified by the Rock Identifier community.
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Desert Rose
Baryte or Gypsum variation (CaSO4·2H2O or BaSO4)
mineral
Pink Quartzite
Quartzite (primarily SiO2 with trace impurities of iron oxides)
metamorphic
Rhodolite Garnet
Magnesium Aluminum Silicate; formula: (Mg,Fe)3Al2(SiO4)3
mineral
Kyanite (Green and Blue varieties)
Kyanite (Al2SiO5)
mineral
Diamond
Diamond (pure native carbon, C)
mineral
Green Fluorite
Calcium Fluoride (CaF2)
mineral
Diamond (in a gold ring setting)
Carbon (C)
mineral
Basalt
Basalt (Mafic Extrusive Igneous Rock)
igneous
Quartz pebble
Silicon dioxide (SiO2)
mineral
Polished Basalt
Basalt (Mafic volcanic rock)
Igneous
Rose Quartz
Silicon Dioxide (SiO2) with traces of Titanium, Iron, or Manganese
mineral
Quartzite
Quartzite (primarily SiO2)
metamorphic
Fluorite
Calcium Fluoride (CaF2)
mineral
Olivine (Peridot)
Magnesium Iron Silicate (Mg, Fe)2SiO4
mineral
Chalcedony (Botryoidal or Tumbled)
Chalcedony (SiO₂)
mineral
Blue Topaz
Aluminum silicate fluoride hydroxide (Al2SiO4(F, OH)2)
mineral
Blue Zircon
Zirconium Silicate (ZrSiO4)
mineral
Green Druzy Quartz (Prasiolite)
Silicon Dioxide (SiO2) with inclusions (typically Chlorite or Actinolite)
mineral
Quartz (likely Milky Quartz)
Quartz (SiO₂ - Silicon Dioxide)
Mineral
Black Tourmaline (Schorl)
Schorl (NaFe2+3Al6(BO3)3Si6O18(OH)4)
mineral
Quartz Vein in Host Rock
Crystalline Silicon Dioxide (SiO2) in Pelitic or Shaly Matrix
metamorphic
Silver (Sterling Silver)
Argentum (Ag) mixed with Copper (Cu); Formula: Ag+Cu
mineral
Yellow Ochre / Limonite
Limonite (FeO(OH)·nH2O)
Mineral
Chert (White Chert / Flint)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Kyanite (Blue or Blue-Grey)
Kyanite (Al2SiO5)
metamorphic mineral
Clear Quartz (Rock Crystal)
Silicon Dioxide (SiO2)
mineral
Agate (specifically a Yellow/Honey Agate)
Silicon Dioxide (SiO2) - Microcrystalline Quartz
mineral
White Agate (Tumbled)
Silicon Dioxide (SiO2) - Cryptocrystalline Chalcedony
mineral
Yellow Chalcedony (Agate)
Silicon Dioxide (SiO2)
sedimentary
Rough Green Tourmaline (Verdelite)
Elbaite (Complex Silicate) - Na(Li,Al)3Al6(BO3)3Si6O18(OH)4
mineral
Chert (specifically Flint or Gray Chalcedony)
Microcrystalline Quartz (SiO2)
sedimentary
Agate Geode
Silicon Dioxide (SiO2)
mineral
Chert (specifically Blue or Grey Chert/Flint)
Microcrystalline or cryptocrystalline Quartz (SiO2)
sedimentary
Banded Agate (Brazilian Agate Slice)
Chalcedony (Silicon Dioxide / SiO2)
Mineral
Banded Agate
Cryptocrystalline Quartz (SiO2)
mineral
Diamond (Lesedi La Rona specimen)
Diamond (Pure Carbon, C)
mineral
Yellow Jasper
Jasper (Silicon Dioxide, SiO2)
sedimentary
Painted River Pebble (likely Basalt or Greywacke)
Aphanitic Lithic Clast with Anthropogenic Pigment coating
Sedimentary or Igneous
Jasper (Red Jasper)
Silicon Dioxide (SiO₂)
sedimentary
Blue Quartzite (River Pebble)
Quartzite (primarily SiO2 with Dumortierite or Crocidolite inclusions)
metamorphic
Quartz Geode
Silicon Dioxide (SiO2)
mineral