Sandstone (Quartz Arenite)
Sandstone (dominated by SiO2 quartz grains)
sedimentary
Category
Man Made Object (Simulant)
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Diamond
Native Carbon (C)
mineral
Chert (Nodule)
Chert (Silicon Dioxide, SiO2)
sedimentary
Granite
Phaneritic Felsic Igneous Rock (primarily Quartz, Feldspar, and Mica)
igneous
Sandstone (likely Quartzose Sandstone)
Arenite
sedimentary
Sandstone (specifically Arkose or Quartz Arenite)
Arenite (primarily SiO2 with possible Feldspar)
sedimentary
Coquina (Fossiliferous Limestone)
Biogenic Limestone (Calcium Carbonate, CaCO3)
sedimentary
Ferruginous Sandstone (Ironstone)
Clastic Sedimentary Rock (composed of SiO2 with Fe2O3/FeO(OH) cement)
sedimentary
Nephrite Jade
Ca2(Mg,Fe)5Si8O22(OH)2 (Tremolite-Actinolite series)
metamorphic
Tumbled pink chalcedony (likely pink agate/jasper)
Microcrystalline quartz, SiO₂, with iron-oxide coloring
mineral
Polished orange agate or chalcedony
Microcrystalline quartz (SiO₂), likely iron-stained chalcedony/agate
mineral
Tumbled reddish-brown stone, likely jasper
Jasper (microcrystalline quartz, SiO₂), possibly red jasper or jasper-rich chert
mineral
Polished carnelian
Carnelian, a red-orange variety of chalcedony (microcrystalline quartz, SiO₂)
gemstone
Green aventurine cabochon (likely)
Quartzite/aventurine quartz, predominantly SiO₂ with possible fuchsite mica
gemstone
Polished tiger’s-eye
Chatoyant quartz, mainly fibrous crocidolite pseudomorphed by quartz (SiO₂)
mineral
Tumbled carnelian (red-orange chalcedony)
Carnelian, a cryptocrystalline variety of quartz: SiO₂
gemstone
Orange chalcedony (likely carnelian)
Microcrystalline quartz, SiO₂; iron-bearing chalcedony (carnelian)
gemstone
Tumbled jasper, likely picture or brecciated jasper
Microcrystalline quartz (SiO₂) with iron-oxide and other mineral impurities
gemstone
Graphic Granite (or Pegmatite with Tourmaline/Biotite)
Alkali-feldspar granite pegmatite
igneous
Aventurine Quartz
Quartz with fuchsite inclusions (SiO2)
mineral
Petrified Wood
Silicified wood (Quartz/Chalcedony replacement)
fossil
Green Jasper
Silicon Dioxide (Microcrystalline Quartz, SiO2)
sedimentary
Labradorite
(Ca,Na)(Al,Si)4O8
mineral
Black Onyx
Chalcedony (SiO2)
gemstone
Green Jasper
Microcrystalline Quartz (SiO2)
sedimentary
Imperial Jasper
Microcrystalline Quartz (Chalcedony), SiO2
sedimentary
Unakite
Altered Granite (Granitic Metamorphic Rock)
metamorphic
Green Aventurine
Quartz (Silicon Dioxide, SiO2) with fuchsite inclusions
mineral
Agate Nodule
Silicon Dioxide (Quartz/Chalcedony), SiO2
sedimentary
Blue-dyed magnesite beads (often sold as “turquoise howlite”)
Magnesite, MgCO₃; commonly dyed blue and possibly marketed as dyed howlite, Ca₂B₅SiO₉(OH)₅
mineral
Petrified Wood
Silicified Wood (Permineralized organic matter, głównie $SiO_2$)
fossil
Jasper
Microcrystalline Quartz (SiO2)
sedimentary
Jasper and Quartz Breccia
Silica breccia (SiO2)
sedimentary
Agate
Silicon dioxide (Chalcedony), SiO2
gemstone
Jasper
Silicon Dioxide (Microcrystalline Quartz), SiO2
sedimentary
Unakite
Altered Granite (Epidotized Granite)
metamorphic
Amazonite
Microcline feldspar (KAlSi3O8)
mineral
Jasper
Microcrystalline Quartz (SiO2)
sedimentary
Brecciated Jasper
Silicon Dioxide (SiO2) with hematite and other mineral impurities
sedimentary
Petrified Wood
Silicified Wood (SiO2)
sedimentary
Agate
Silica (Chalcedony), SiO2
sedimentary
Jasper and Agate (Polychrome Jasper / Mookaite variety)
Silicon dioxide (SiO2) microcrystalline quartz
sedimentary