Iron-rich laterite or weathered ironstone
Ferricrete/limonite-rich ironstone; primarily goethite (FeO(OH)) and hematite (Fe₂O₃), with clay minerals
sedimentary
Category
Igneous And Sedimentary Mixture
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Limonite (Iron Ore)
Limonite (FeO(OH)·nH2O)
mineral
Moonstone
Orthoclase Feldspar (KAlSi3O8) or Albite mixtures
mineral
Weathered iron-rich concretion or limonite/goethite nodule
Limonite (largely hydrated iron oxides; commonly goethite, FeO(OH), and hematite, Fe₂O₃)
mineral
Limonite Pseudomorph after Pyrite
Limonite (Hydrous iron oxides, FeO(OH)·nH2O) replacing Pyrite (FeS2)
mineral
Granite Gravel / Crushed Granite
Plutonic Felsic Igneous Rock
igneous
Asphalt (Road Aggregate)
Asphalt concrete / Bituminous mixture
anthropogenic sedimentary (technolith)
Agate
Silicon Dioxide (Chalcedony), SiO2
sedimentary
Agate
Silicon Dioxide (Chalcedony), SiO2
sedimentary
Bumblebee Jasper
Fossiliferous Volcanic Rock (composed of Calcium Carbonate, Manganese Oxides, and Arsenic Sulfides)
igneous
Chalcedony (Agate and Carnelian varieties)
Silicon Dioxide (SiO2)
mineral
Limonite (Iron Stone/Iron Ore)
FeO(OH)·nH2O (Hydrous ferric oxide)
mineral
Epidote
Epidote (Ca2(Al2,Fe3+)(SiO4)(Si2O7)O(OH))
metamorphic
Yellow Jasper
Silicon Dioxide (SiO2) with iron oxide inclusions
sedimentary
Blue Agate Slice
Chalcedony (SiO2)
gemstone
Tumbled Agate
Silicon Dioxide (Quartz variety: Chalcedony)
gemstone
Agate
Silicon dioxide (Chalcedony), SiO2
sedimentary
Agate
Chalcedony (SiO2)
mineral
Weathered iron-rich rock, likely limonite-bearing sandstone or laterite
Limonite/goethite-rich ferruginous rock; composition commonly FeO(OH)·nH₂O with quartz and clay minerals
sedimentary
Yellow Agate
Silicon Dioxide (SiO2)
gemstone
Pyrulite (Pyrite / Chalcopyrite)
Iron Sulfide (FeS2) or Copper Iron Sulfide (CuFeS2)
mineral
Epidote
Epidote (Ca2(Al2,Fe3+)(SiO4)(Si2O7)O(OH))
mineral
Ruby Zoisite
Anyolite (Ca2Al3(SiO4)3(OH) + Al2O3:Cr)
metamorphic
Diorite
Diorite (intermediate intrusive igneous rock)
igneous
Limonite (with Goethite/Ironstone)
FeO(OH)·nH2O (Hydrated Iron Oxide)
mineral
Fancy Jasper
Silicon Dioxide (SiO2) with mineral inclusions
sedimentary
Biotite-bearing granite or granitic gneiss
Quartz–feldspar granite with biotite and accessory mica/amphibole
igneous
Yellow Chalcedony / Yellow Agate
Silicon Dioxide (SiO2)
mineral
Granite / Pegmatite Pebble
Felsic intrusive igneous rock
igneous
Limonite (often after Hematite or Goethite)
Limonite (FeO(OH)·nH2O)
mineral
Limonite / Ironstone
Hydrated Iron Oxide (FeO(OH)·nH2O)
mineral
Tumbled sodalite
Sodalite, Na₈(Al₆Si₆O₂₄)Cl₂
mineral
Agate
Chalcedony (SiO2)
sedimentary
Agate
Silicon Dioxide (Chalcedony), SiO2
sedimentary
Agate
Silicon dioxide (chalcedony variety), SiO2
sedimentary
Limonite (after Pyrite Pseudomorph)
Limonite (Hydrated Iron Oxide Mixture, FeO(OH)·nH2O)
mineral
Grey Chalcedony (Agate)
Silicon Dioxide (SiO2)
mineral
Limonite (Iron Ore)
Hydrous ferric oxides (FeO(OH)·nH2O)
mineral
Granodiorite
Granodiorite (containing Plagioclase, Quartz, and K-feldspar)
igneous
Polished Tumbled Fluorite (or Dark Amethyst)
CaF2 (Calcium Fluoride) / SiO2 (Silicon Dioxide)
mineral
Limonite (Ironstone) Concretion
FeO(OH)·nH2O (Hydrous ferric oxide)
sedimentary
Epidote
Epidote (Ca2(Al,Fe)3(SiO4)3(OH))
mineral