Quartz Vein in Metamorphic Rock
Silicon Dioxide (SiO2) within Metasedimentary host
metamorphic
Category
Industrial Byproduct (Anthropogenic Rock Like Material)
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Granitic Pegmatite (with Smoky Quartz and Mica)
Granitic Pegmatite (composed of SiO2, KAl2(AlSi3O10)(OH)2, and (K,Na)(AlSi3O8))
igneous
Sandstone
Arenite (typically SiO2 based)
sedimentary
Sandstone
Clastic sedimentary rock
sedimentary
Sandstone with Lichen and Iron Oxide Staining
Quartz Arenite / Sandstone
sedimentary
Rounded dark pebble, likely basalt or andesite
Fine-grained mafic to intermediate volcanic rock; commonly basalt (plagioclase, pyroxene, ± olivine)
igneous
Quartzite
Quartzite (SiO2)
metamorphic
Milky Quartz with Iron Staining
Silicon Dioxide (SiO2)
mineral
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Sandstone (or Siltstone / Ceramic Sherd)
Arenite / Siltstone (dominated by SiO2)
sedimentary
Likely metallic meteorite fragment
Undetermined iron or stony-iron meteorite; mineralogy requires testing
meteorite
Pumice
Pumice (felsic volcanic rock)
igneous
Granite
Phaneritic Igneous Rock (composed of quartz, alkali feldspar, and plagioclase)
igneous
Serpentine / Antigorite
Mg3Si2O5(OH)4 (Serpentine Group)
metamorphic
Sandstone
Clastic Sedimentary Rock
sedimentary
Sandstone
Sedimentary rock composed mainly of quartz sand
sedimentary
Quartz Geode
Silicon Dioxide (SiO2)
mineral
Muscovite Mica Schist
Metamorphic Rock (Muscovite-Biotite Schist)
metamorphic
Small tumbled jasper or agate pebble
Likely microcrystalline quartz (SiO₂), possibly jasper or chalcedony
mineral
Chert (Nodule)
Chert (Silica, SiO2)
sedimentary
Small pale rock fragment
Indeterminate; possibly quartz, calcite, or a weathered feldspar-rich fragment
mineral
Sandstone
Arenite (Sedimentary Rock)
sedimentary
Possible pink quartz specimen in a dark matrix
Uncertain from the image; possibly rose quartz (SiO₂) attached to a dark host rock
mineral
Carborundum
Silicon Carbide (SiC)
mineral
Milky quartz
Quartz (silicon dioxide, SiO₂)
mineral
Probable fossil-bearing rock or mineral concretion
Unidentified carbonate-rich concretion with a possible fossil inclusion
fossil
Mica Schist
Metamorphic Schist
metamorphic
Likely polished labradorite (small tumbled stone)
Labradorite, a plagioclase feldspar; approximately (Ca,Na)(Al,Si)₄O₈
mineral
Small rock fragments; likely mixed local gravel, not identifiable to one species
Unidentified lithic fragments; individual rock types cannot be determined reliably from this photograph
sedimentary
Quartz
Silicon Dioxide (SiO2)
mineral
Likely dyed or painted stone
Unidentified natural rock; vivid purple, orange, and pink coloration appears to be a surface coating or pigment, so the underlying rock cannot be reliably identified from the image.
metamorphic
Sandstone
Clastic Sedimentary Rock
sedimentary
Weathered quartz-rich rock or fossil fragment
Indeterminate; likely quartz-bearing sandstone or siliceous fossil material
mineral
Likely biotite-rich schist
Mica schist, chiefly quartz and mica (commonly biotite; possible muscovite)
metamorphic
Black Tourmaline (Schorl)
Sodium Iron Aluminum Borate Silicate (NaFe3Al6(BO3)3Si6O18(OH)4)
mineral/gemstone
Sandstone
Arenite (clastic sedimentary rock)
sedimentary
Barite Rose
Barium Sulfate (BaSO4)
mineral
Diamond (or Diamond Simulant)
Carbon (C) if diamond, various if simulant (e.g., Cubic Zirconia ZrO2)
gemstone
Sandstone
Sedimentary Rock (Quartz arenite)
sedimentary
Colorless faceted gemstone, likely quartz
Quartz (SiO₂), tentatively identified from the image
gemstone
Basalt
Basalt (Mafic volcanic rock)
igneous
Granitic Pegmatite
Granite (with coarse-grained Quartz, Feldspar, and Mica components)
igneous