Tiger's Eye
Pseudomorph of Quartz after Crocidolite (SiO2 with inclusions of Iron Oxide)
metamorphic
Category
Mineraloid (Man Made Origin)
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Petrified Wood
Silicified Wood (SiO2)
sedimentary
Quartzite River Rock
Metamorphosed Sandstone (SiO2)
metamorphic
Jasper with Quartz Veining
Silicon Dioxide (SiO2) with impurities
sedimentary
Quartzite
Quartzite (SiO2)
metamorphic
Gold Nugget
Native Gold (Au)
mineral
Quartzite
Quartzite (composed primarily of Quartz, SiO2)
metamorphic
Red Quartzite
Metamorphosed Quartz Sandstone (SiO2)
metamorphic
Oolitic Chert
Oolitic Microcrystalline Quartz (SiO2)
sedimentary
Quartzite
Quartzite (SiO2)
metamorphic
Dyed Agate
Silicon Dioxide (SiO2) with artificial pigment
mineral
Rhodonite
Rhodonite (Manganese Silicate), chemical formula: (Mn,Fe,Mg,Ca)SiO3
Mineral
Greenstone (Amygdaloidal Basalt)
Amygdaloidal Basalt (frequently composed of Plagioclase Feldspar, Pyroxene, and Olivine with Chlorite inclusions)
igneous
Granite Glacial Erratic
Granite (Phaneritic Quartz-Feldspar Plutonic Rock)
igneous
Quartzite Beach Pebble
Quartzite (primarily SiO2)
metamorphic
Mica Schist (with Golden/Biotite inclusions)
K(Mg,Fe)3AlSi3O10(F,OH)2 (Biotite), KAl2(AlSi3O10)(F,OH)2 (Muscovite)
metamorphic
Jasper
Silicon dioxide (SiO2) with impurities
sedimentary
Banded Iron Formation (BIF) / Iron Ore
Banded Iron Formation (composed primarily of Hematite (Fe2O3) and Magnetite (Fe3O4) with Quartz/Chert)
sedimentary
Quartzite
Quartzite (SiO2)
metamorphic
Quartz (Milky or Smoky variant)
Silicon Dioxide (SiO2)
mineral
Greenish Metamorphic Rock (likely containing epidote or chlorite)
Metamorphic rock, possibly epidosite or greenstone
Metamorphic
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Quartzite
Quartzite (primarily SiO2)
metamorphic
Quartz (Milky/Clear variety)
Silicon Dioxide (SiO2)
mineral
Quartz Vein in Rhyolite
Silicon Dioxide (SiO2) in extrusive igneous rock
igneous
Rough Amethyst Quartz
Silicon Dioxide with Iron impurities (SiO2)
mineral
Clear Quartz Crystal
Quartz (Silicon Dioxide, SiO2)
mineral
Diamond (in jewelry)
Carbon (C)
mineral
Granite
Phaneritic Igneous Rock (Granoid)
igneous
Rose Quartz
Rose Quartz (SiO2 with traces of Titanium, Iron, or Manganese)
mineral
Granite
Phaneritic Felsic Igneous Rock
igneous
Schist
Schist (various mineralogical compositions including mica, chlorite, talc, etc.)
Metamorphic
Iron Slag
Iron smelting byproduct (Glassy/vesicular silicate)
anthropogenic / industrial byproduct
Yellow Quartz
Silicon Dioxide (SiO2)
mineral
Peridot
Olivine (Mg, Fe)₂SiO₄
mineral
Quartz (Vein Quartz)
Silicon Dioxide (SiO2)
mineral
Sandstone (Ferruginous)
Sandstone (primarily SiO2 with Iron Oxide cement)
sedimentary
Quartzite
Metamorphic Quartzite (predominantly SiO2)
metamorphic
Chert Pebble with Quartz Veins
Microcrystalline Quartz (SiO2)
sedimentary
Tiger's Eye
Pseudomorph of Quartz after Crocidolite (SiO2)
mineral
Yellow Quartzite (River Stone)
Quartzite (primarily SiO2)
metamorphic
Limonite after Pyrite (Pseudomorph)
FeO(OH)·nH2O following FeS2
mineral