Rutilated Quartz
Quartz with Rutile inclusions (SiO2 with TiO2)
mineral
Category
Man Made Object (Simulant)
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Chert (varieties include Flint and Mudstone)
Microcrystalline Silica (SiO2)
sedimentary
Chert (with Desert Varnish/Iron Stain)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Red Jasper
Jasper (Silicon Dioxide with Iron Oxide inclusions, SiO2 + Fe2O3)
mineral
Chert (Flint)
Silicon Dioxide (SiO2)
sedimentary
Coquina / Fossiliferous Limestone
Coquina (composed primarily of Calcium Carbonate / CaCO3)
sedimentary
Diorite
Diorite
igneous
Smoky Quartz Cluster
Smoky Quartz (Silicon Dioxide - SiO2)
mineral
Pink calcite (likely)
Calcite — calcium carbonate, CaCO₃
mineral
Rhodonite
Manganese Silicate (Mn, Fe, Mg, Ca)SiO3
mineral
Tumbled carnelian agate (probable)
Cryptocrystalline quartz, SiO₂; chalcedony variety colored by iron oxides
gemstone
Tumbled tiger’s-eye
Tiger’s-eye quartz, SiO₂ with fibrous crocidolite pseudomorphs
mineral
Polished striped jasper pebble
Jasper, microcrystalline quartz (SiO₂) with iron-oxide and clay inclusions
sedimentary
Polished dark green stone, likely nephrite jade or serpentine
Nephrite jade: tremolite–actinolite amphibole, Ca₂(Mg,Fe)₅Si₈O₂₂(OH)₂; possible serpentine: Mg₃Si₂O₅(OH)₄
metamorphic
Polished ocean jasper (orbicular jasper), probable
Microcrystalline quartz/chalcedony (SiO₂) with iron-oxide and other mineral inclusions
mineral
Polished agate/jasper pebble
Microcrystalline quartz (chalcedony), SiO₂, with likely iron-oxide and clay inclusions
mineral
Banded agate (likely carnelian/chalcedony)
Microcrystalline quartz, SiO₂; iron-stained chalcedony
mineral
Red jasper pebble
Jasper, microcrystalline quartz (SiO₂) colored mainly by iron oxides
mineral
Polished tiger’s-eye
Tiger’s-eye, a chatoyant quartz variety; SiO₂ with fibrous pseudomorphic crocidolite/goethite inclusions
mineral
Tumbled carnelian (likely)
Orange-red chalcedony, microcrystalline quartz (SiO₂)
mineral
Tumbled carnelian
Carnelian, a red-orange variety of chalcedony (microcrystalline quartz, SiO₂)
gemstone
Polished tourmalinated quartz
Quartz (SiO₂) with black schorl tourmaline (NaFe₃Al₆(BO₃)₃Si₆O₁₈(OH)₄) inclusions
mineral
Agate
Silicon Dioxide (Chalcedony), SiO2
sedimentary
Unakite
Altered Granite (Granitic Metamorphic Rock)
metamorphic
Agate
Silicon dioxide (Chalcedony), SiO2
gemstone
Petrified Wood
Silicified wood (Quartz replacement of organic wood structure)
fossil
Quartz Crystal
Silicon Dioxide (SiO2)
mineral
Agate
Silicon Dioxide (SiO2) - Chalcedony variety
sedimentary
Agate
Silicon Dioxide (Chalcedony), SiO2
sedimentary
Agate
Silicon Dioxide (Chalcedony), SiO2
sedimentary
Jasper and Chalcedony Nodule
Silicon Dioxide (SiO2) - Microcrystalline Quartz
sedimentary
Shiva Lingam Stone
Cryptocrystalline Quartz (Jasper/Basalt matrix)
sedimentary
Agate
Silicon dioxide (Chalcedony), SiO2
sedimentary
Unakite
Altered Granite (Epidote, Pink Orthoclase Feldspar, and Quartz)
metamorphic
Green aventurine (likely)
Quartzite dominated by quartz (SiO₂), colored green by fuchsite mica or chlorite
mineral
Jasper
Microcrystalline Quartz (SiO2)
sedimentary
Jasper
Silicon Dioxide (Microcrystalline Quartz), SiO2
sedimentary
Agate
Silicon dioxide (Chalcedony), SiO2
sedimentary
Prehnite
Prehnite (Ca2Al2Si3O10(OH)2)
mineral
Chalcedony
Silicon Dioxide (SiO2)
mineral
Petrified Wood
Silicified wood (Quartz / Chalcedony replacement of organic cellulose)
fossil
Rhodonite
Inosilicate, (Mn,Fe,Mg,Ca)SiO3
mineral