Jasper (specifically Yellow or Brown Jasper)
Silicon Dioxide (SiO2) with iron oxide inclusions
sedimentary
Category
Mineral, Often Found As A Rock
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Magnetite (Lodestone variety)
Magnetite (Fe3O4)
mineral
Milky Quartz with Iron Staining
Silicon Dioxide (SiO2)
mineral
Chert (and/or Flint)
Microcrystalline or cryptocrystalline Quartz (SiO2)
sedimentary
Breciated Jasper
Silicon Dioxide (SiO2) with iron oxide inclusions
sedimentary
Common Opal / Chert
Hydrated silica (SiO2·nH2O) or Microcrystalline Quartz (SiO2)
mineral
Chert (Quartz)
Microcrystalline Silica (SiO2)
sedimentary
Pumice
Vesicular volcanic glass
igneous
Quartzite pebble with Mafic inclusions
Quartzite (SiO2)
metamorphic
Chert (variant Flint)
Silicon Dioxide (SiO2)
sedimentary
Quartz (Float/Abraded)
Quartz (SiO₂)
Mineral
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Magnetite (Iron Ore)
Magnetite (Fe3O4)
mineral
River Rock
Sedimentary clast
sedimentary
Yellow Jade
Nephrite (Ca2(Mg, Fe)5Si8O22(OH)2) or Jadeite (NaAlSi2O6)
metamorphic
Quartz pebble
SiO2
mineral
Quartzite
Quartzite
metamorphic
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Turquoise
CuAl6(PO4)4(OH)8"""""""""" """""""""" """""""""" """""""""" """""""""" """""""""" """""""""" """""""""" """""""""" """""""""" """""""""" """""""""" """""""""" """""""""" """""""""" """""""""" """""""""" """""""""" """""""""" """""""""" • 4H2O (Hydrated copper and aluminum phosphate)
mineral
Chert (specifically Flint or Jasper variant)
Cryptocrystalline Quartz (SiO2)
sedimentary
Nephrite Jade
Ca2(Mg, Fe)5Si8O22(OH)2
metamorphic
Ironstone / limonite-rich rock
Limonite, chiefly hydrated iron oxides (FeO(OH)·nH₂O), commonly mixed with goethite and hematite
mineral
Chert
Chert (Microcrystalline Quartz, SiO2)
sedimentary
Chert (and/or Flint)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Cloudy Quartz
Quartz (Silicon Dioxide, SiO2)
mineral
Chert / Flint
Cryptocrystalline Quartz (Silicon Dioxide, SiO2)
sedimentary
Jasper or Chert with Quartz Vugs
Silicon Dioxide (SiO2)
sedimentary
Schist
Mica Schist
metamorphic
Sandstone or possibly a conglomerate
Arenite (if sandstone)
sedimentary
Chert (Black Chert/Flint)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Yellow Agate (Banded Chalcedony)
Silicon Dioxide (SiO2)
sedimentary
Green Fluorite
Calcium Fluoride (CaF2)
mineral
Chalcedony (specifically Agate or Common Opal variety)
Cryptocrystalline Silica (SiO2)
mineral
Chrysocolla on Limonite Matrix
Cu2-xAlx(H2-xSi2O5)(OH)4·nH2O (Chrysocolla) on FeO(OH)·nH2O (Limonite)
mineral
Jasper
Jasper (Silicon Dioxide, SiO2)
sedimentary
Fossil coral fragment
Likely fossilized colonial coral; exact taxon cannot be determined from the fragment
fossil
Iron-rich weathered pebble (likely limonite/goethite-bearing rock)
Limonite mixture, commonly dominated by goethite (FeO(OH)) and hematite (Fe₂O₃)
mineral
Banded Chert
Microcrystalline Quartz (SiO2)
sedimentary
Jasper
SiO2
sedimentary
Black Jasper (Black Stone / River Pebble)
Silicon Dioxide (SiO₂), Opaque variety of Chalcedony
sedimentary
Banded Agate
Agate (Cryptocrystalline variety of Quartz, SiO2)
mineral