Quartz Crystal Fragment
Silicon Dioxide (SiO2)
mineral
Category
Synthetic Material (Not A Rock Or Mineral)
Browse synthetic material (not a rock or mineral) specimens identified by the Rock Identifier community.
Learn about Synthetic Material (Not A Rock Or Mineral) in the encyclopedia
View all →
Fossil Snail
Gastropoda fossil
fossil
Sandstone
Arenite (SiO2 based)
sedimentary
Sandstone with Quarzite clasts
Arenite (SiO2 based)
sedimentary
Sandstone
Sedimentary Rock (Quartzose Sandstone)
sedimentary
Jasper
Silicon dioxide (Microcrystalline quartz, SiO2)
mineral
Polished blue chalcedony or glass-like quartz specimen
Chalcedony (microcrystalline SiO₂), possibly treated or synthetic; exact identification requires testing
gemstone
Ametrine
SiO2 (Silicon Dioxide with iron impurities)
gemstone
Opal
Hydrated amorphous form of silica (SiO2·nH2O)
mineral
Clear Quartz
Silicon Dioxide (SiO2)
mineral
Fossilized Bone Fragment
Vertebrate Fossil
fossil
Sandstone
Arenite
sedimentary
Asphalt (Road Aggregate)
Asphalt concrete / Bituminous mixture
anthropogenic sedimentary (technolith)
Shale
Clastic Sedimentary Rock
sedimentary
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Fossilized Tooth
Vertebrate Fossilized Tooth (Mineralized Biogenic Material)
fossil
Likely basalt pebble
Basalt; fine-grained mafic volcanic rock, chiefly plagioclase and pyroxene with possible olivine
igneous
Asphalt Concrete
Bituminous Concrete / Asphaltic Composite
not a natural rock (man-made composite)
Sandstone
Arenite (primarily SiO2)
sedimentary
Shark Tooth Fossil
Vertebrate fossilized tooth
fossil
Sandstone
Sedimentary quartz arenite
sedimentary
Sandstone
Sedimentary Clastic Rock (Quartz-rich)
sedimentary
Sedimentary Sandstone (Sandstone Slab)
Arenite (SiO2 with Fe2O3 staining)
sedimentary
Possible weathered quartz-rich rock or iron-stained mineral fragment
Indeterminate; possibly quartz (SiO₂) with iron-oxide inclusions
mineral
Banded Ironstone / Jasper Siltstone
Siltstone with Iron Oxide Hydrates (SiO2 with Fe2O3/FeO(OH))
sedimentary
Porphyritic Basalt or Porphyritic Andesite
Porphyritic volcanic rock
igneous
Milky Quartz
Quartz (Silicon Dioxide, SiO2)
mineral
Sandstone
Quartz Sandstone (predominantly)
Sedimentary
Sandstone Pebble
Sedimentary Clastic Rock (Quartz Arenite)
sedimentary
Greenstone / altered basalt fragment
Likely chlorite–epidote–actinolite altered basalt; exact identification requires testing
igneous
Diamond
Carbon (C)
mineral
Diamond (in Matrix)
Carbon (C)
mineral
Aggregate Concrete
Anthropogenic Conglomerate (Technosol)
sedimentary
Sandstone (Wonderstone)
Arenite (composed primarily of SiO2 with Fe2O3 impurities)
sedimentary
Sandstone (Ferruginous)
Ferruginous Sandstone (SiO2 with Fe2O3)
sedimentary
Asphalt (Bituminous Rock)
Natural bitumen or Bituminous limestone/sandstone
sedimentary
Sandstone
Arenite (SiO2 with various cementing agents)
sedimentary
Red Sandstone
Arenite (with Iron Oxide cement)
sedimentary
Generic Pebble / Rock Fragment
Lithic fragment / Weathered rock
sedimentary
Granite
Felsic intrusive igneous rock
igneous
Strawberry Quartz (or Rose Quartz / Cherry Quartz)
Silicon Dioxide (SiO2) with Lepidocrocite, Hematite, or Goethite inclusions
mineral
Dyed Blue Agate
Silicon Dioxide (SiO2) - Microcrystalline Quartz
mineral