Milky Quartz
Silicon Dioxide (SiO2)
mineral
Category
Man Made Material
Browse man made material specimens identified by the Rock Identifier community.
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Sandstone
Arenite (SiO2 based with cement)
sedimentary
Sandstone (Ferruginous)
Clastic Sedimentary Rock (primarily SiO2 with Fe2O3 staining)
sedimentary
Sandstone
Arenite
sedimentary
Sandstone (Banded)
Clastic sedimentary rock (primarily SiO2)
sedimentary
Sandstone
Arenite (primarily composed of SiO2)
sedimentary
Milky Quartz with Iron Inclusions
Silicon Dioxide (SiO2)
mineral
Red Shale
Fissile Siliciclastic Sedimentary Rock
sedimentary
Sandstone
Arenite (primarily SiO2)
sedimentary
Siltstone or Mudstone
Argillaceous sedimentary rock
sedimentary
Quartzite
Quartzite (primarily SiO2)
metamorphic
Quartzite with Iron Staining
Silicon Dioxide (SiO2) with Fe2O3 impurities
metamorphic
Quartzite
Quartzite (primarily SiO2)
metamorphic
Green glass-like cabochon, likely synthetic glass or resin
Unidentified green transparent material; possibly molded glass, synthetic spinel, or resin
gemstone
Polished jasper (likely brecciated or iron-rich jasper)
Microcrystalline quartz (SiO₂), colored by iron oxides/hydroxides and possibly sulfide minerals
mineral
Petrified Wood
Silicified Wood (SiO2)
fossil
Diamond
Carbon (C)
mineral
Porphyritic Basalt or Diabase with Plagioclase Phenocrysts
Porphyritic Basalt or Diabase; Mineral: Plagioclase Feldspar
Igneous
Red Sandstone
Quartzose Sandstone (primarily quartz grains cemented by iron oxides)
sedimentary
Mammoth or Mastodon Tooth Fossil
Mammuthus / Mammut tooth
fossil
Fancy Jasper
Jasper (Cryptocrystalline Quartz, SiO2)
sedimentary
Serpentinite
Serpentinite (Mg, Fe, Ni, Al, Zn, Mn)2-3(Si, Al, Fe)2O5(OH)4
metamorphic
Peridot (Olivine)
Magnesium Iron Silicate (Mg, Fe)2SiO4
mineral
Quartzite
Quartzite (SiO2)
metamorphic
Green Jasper
Jasper (Silicates, SiO2)
sedimentary
Jasper (Petrified Wood Variety)
Silicon Dioxide (SiO2)
sedimentary
Granite (specifically Rapakivi Granite)
Phaneritic Felsic Igneous Rock (Granite)
igneous
Fossilized Shark Tooth (Partial) or Coprolite
Elasmobranchii (fossil) or Coprolite (trace fossil)
fossil
Jasper
Silicon Dioxide (SiO2)
mineral
Chert (Flint)
Silicon Dioxide (SiO2)
sedimentary
Olivine (Peridot)
Magnesium Iron Silicate ((Mg, Fe)2SiO4)
mineral
Olivine (Peridot)
Olivine Group (Magnesium Iron Silicate), (Mg, Fe)2SiO4
mineral
Jasper with Hematite Inclusions
Silicon Dioxide (SiO2) with Iron Oxide (Fe2O3)
sedimentary
Chert (specifically Flint or Chalcedony nodule)
Microcrystalline Quartz (SiO2)
sedimentary
Chert
Microcrystalline Quartz (SiO2)
sedimentary
Serpentine
Serpentinite (group of minerals based on (Mg,Fe,Ni,Al,Zn,Mn)2-3(Si,Al,Fe)2O5(OH)4)
metamorphic
Mixed river-worn rock and mineral collection
Mostly quartz/quartzite, feldspar-bearing granitoid, chert, and mafic volcanic rocks; exact species vary by pebble
igneous, sedimentary, metamorphic, mineral
Small polished dark mineral or gemstone fragment
Indeterminate; possibly smoky quartz, obsidian, or dark tourmaline
mineral
Tumbled black stone, likely basalt or obsidian
Uncertain; likely fine-grained basalt (plagioclase–pyroxene) or dark volcanic glass (obsidian)
igneous
Weathered iron-rich sandstone or lateritic rock
Ferruginous sandstone/laterite; chiefly quartz (SiO₂) with iron oxides such as hematite and goethite
sedimentary
Quartz-bearing altered rock, possibly iron-stained quartz vein
Quartz (SiO₂) in a feldspathic/sericitized host, with iron-oxide staining
mineral
Chert (flint-like chalcedony)
Microcrystalline quartz, SiO₂
sedimentary