Tumbled rose quartz
Rose quartz (pink quartz), silicon dioxide, SiO₂
mineral
Category
Man Made Material
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Quartz pebble in concrete
Quartz (SiO₂), embedded in Portland-cement concrete
mineral
Flint
Microcrystalline Quartz (SiO2)
sedimentary
Flint / Chert Nodule
Sedimentary cryptocrystalline quartz (SiO2)
sedimentary
Chert / Flint
Microcrystalline quartz (SiO2)
sedimentary
Flint
SiO2 (Cryptocrystalline Quartz)
sedimentary
Chert / Flint (or lithic artifact flake)
Microcrystalline Quartz (SiO2)
sedimentary
Greenschist (or Serpentinite with Manganese Dendrites)
Greenschist facies metamorphic rock
metamorphic
Basalt River Pebble
Basalt
igneous
Unakite (likely)
Epidote–pink feldspar–quartz rock; commonly termed unakite
metamorphic
Serpentinite (probable)
Serpentinite, dominated by serpentine-group minerals (Mg₃Si₂O₅(OH)₄), with dark magnetite or chromite and pale carbonate/talc possible
metamorphic
Peridot (Olivine)
Magnesium Iron Silicate (Mg, Fe)2SiO4
mineral
Olivine (Peridot in gem form)
Magnesium Iron Silicate (Mg,Fe)2SiO4
mineral
Yellow Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Milky quartz with iron-oxide staining
Quartz (silicon dioxide, SiO₂)
mineral
Red Sandstone
Arenite (primarily composed of SiO2 with Fe2O3 cement)
sedimentary
Chert (and Flint)
Silicon Dioxide (SiO2)
sedimentary
Conglomerate with Fossilized Shark Teeth
Clastic sedimentary rock (Conglomerate) containing Elasmobranchii remains
sedimentary
Diamond
Native Carbon (C)
mineral
Chert (within Limestone)
Silicon Dioxide (SiO2)
sedimentary
Red Jasper
Silicon Dioxide (SiO2) with Hematite impurities
sedimentary
Jasper with Quartz Vein
Silicon Dioxide (SiO2) with impurities
sedimentary
Chert (Jasper/Flint variety)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Peridot (Olivine)
Olivine (Magnesium Iron Silicate), (Mg,Fe)2SiO4
mineral
Rose Quartz (carved cutlass pendant)
Silicon Dioxide (SiO2)
gemstone
Rose Quartz
Silicon Dioxide (SiO2)
mineral
Quartz (Milky or Iron-Stained)
Silicon Dioxide (SiO2)
mineral
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Polished pink-and-gray stone, likely rhodonite-bearing rock
Rhodonite (MnSiO₃) in a manganese-rich metamorphic matrix; exact identification requires testing
metamorphic
Tumbled serpentine with dark magnetite/chromite matrix
Serpentinite; chiefly antigorite/lizardite, Mg3Si2O5(OH)4, with magnetite and possibly chromite
metamorphic
Petrified Wood
Silicified Wood (SiO2 permineralization)
fossil
Petrified Wood
Silicified Wood (SiO2)
sedimentary
Jasper
Silicon dioxide (SiO2)
Mineral/Sedimentary
Likely biotite schist or mica-rich metamorphic rock
Mica schist, predominantly biotite mica with quartz and feldspar
metamorphic
Weathered iron-rich sandstone or laterite
Ferruginous sandstone; chiefly quartz (SiO₂) cemented or stained by iron oxides such as hematite and goethite
sedimentary
Likely black beach pebble
Undetermined; possibly basalt, chert, or dark slate
sedimentary
Quartz-rich metallic sulfide ore (probable pyrite-bearing rock)
Pyrite, FeS₂, in a quartz-rich host; exact identification is uncertain from the image
mineral
Chert
Microcrystalline Quartz (SiO2)
sedimentary
Arid Sandy Loam
Arenosols / Regosols
sedimentary
Petrified Wood
Silicified Wood (Permineralized Lycopsid, Conifer, or Hardwood)
fossil
Vesicular volcanic rock, likely weathered scoria
Scoria (vesicular basaltic-andesitic volcanic rock), composition approximately plagioclase, pyroxene, and volcanic glass
igneous
Rose Quartz
SiO2 (Silicon Dioxide)
mineral