Lapis Lazuli
Lapis lazuli (a rock primarily composed of Lazurite, (Na,Ca)8(AlSiO4)6(S,Cl,SO4,OH)2)
metamorphic
Category
Anthropogenic Material (Man Made Rock)
Browse anthropogenic material (man made rock) specimens identified by the Rock Identifier community.
Sandstone
Sandstone (composed primarily of sand-sized minerals or rock grains)
sedimentary
Unknown Organic Object (likely a berry or fruit)
Not applicable; this is not a geological specimen. If it were a cranberry, its scientific name would be Vaccinium macrocarpon; if a cherry, it would be Prunus avium or Prunus cerasus.
Organic Material (likely a fruit or berry)
Tiger's Eye
Tiger's Eye (a variety of Quartz, SiO₂)
Mineral (specifically a gemstone variety)
Quartz
Quartz (SiO₂)
mineral
Quartz Geode/Druzy Quartz
Quartz (SiO₂)
Mineral
Quartz
Silicon Dioxide (SiO2)
Mineral
Diamond (Rough)
Diamond (C)
Mineral
Garnet (likely Pyrope or Almandine)
Garnet Group (complex nesosilicate minerals, e.g., Pyrope Mg3Al2(SiO4)3, Almandine Fe3Al2(SiO4)3, Spessartine Mn3Al2(SiO4)3, Grossular Ca3Al2(SiO4)3, Andradite Ca3Fe2(SiO4)3, Uvarovite Ca3Cr2(SiO4)3). The vivid red color in the image strongly suggests Pyrope or Almandine.
Mineral
Biotite Mica
K(Mg,Fe2+)3(Al,Fe3+)Si3O10(OH,F)2
Mineral
Rutilated Quartz
Quartz (SiO2) with Rutile (TiO2) inclusions
Mineral
Oak-grain Laminate (Industrial/Decorative Furniture Finish)
Melamine Resin-impregnated Decorative Paper on Particleboard (Cellulose/Thermosetting Plastic)
not a rock (synthetic material)
Coquina
Coquina (a type of limestone)
Sedimentary
Quartz
Quartz (SiO₂)
Mineral
Lapis Lazuli
Lapis Lazuli (Complex silicate rock containing Lazurite (Na,Ca)8(AlSiO4)6(S,Cl,SO4,OH)2, Pyrite, and Calcite)
metamorphic
Citrine Quartz
Citrine (Silicon Dioxide - SiO2)
Mineral
Diamond
Diamond (pure carbon; C)
Mineral
Basalt
Basalt
igneous
Travertine (used in construction, not a 'specimen' in situ)
Travertine
Sedimentary
Quartz
Quartz (SiO2 - Silicon Dioxide)
Mineral
Quartz
Silicon Dioxide (SiO₂)
Mineral
Caliche (also known as hardpan, calcrete, kankar)
Primarily composed of calcium carbonate (CaCO₃), often mixed with other minerals like quartz, clay minerals, and iron oxides.
Mineral
Schist
Schist
metamorphic
Banded Jasper (Chert)
Silicon Dioxide (SiO2) - variety of Chalcedony
Sedimentary Rock
Dolomite
Dolomite (CaMg(CO3)2)
Mineral
Quartz (pebble)
Quartz (SiO₂)
Mineral
Chert Arrowhead
Cryptocrystalline Quartz (SiO2)
sedimentary
Chert (varieties include Flint or Jasper)
Chert (cryptocrystalline quartz; SiO₂)
Sedimentary
Serpentine
Serpentinite (rock), Serpentine group minerals (e.g., Antigorite, Lizardite, Chrysotile)
Metamorphic rock
Quartz
Quartz (SiO2 - Silicon Dioxide)
Mineral
Quartz with Iron Stains
Quartz (SiO2) with iron oxide/hydroxide staining
Mineral
Quartz (likely)
Quartz (SiO2 - Silicon Dioxide)
Mineral
Chert (Arrowhead or Flake)
Microcrystalline quartz (SiO2)
sedimentary
Diamond
Diamond (carbon allotrope), C (chemical formula)
Mineral
Quartzite
Quartzite
Metamorphic rock
Biotite Mica
Biotite (K(Mg,Fe)3AlSi3O10(F,OH)2)
mineral
Conglomerate
Conglomerate
Sedimentary
Quartz (likely Jasper or Chert variety)
Quartz (SiO₂)
Mineral
Fuchsite Quartzite
Fuchsite-bearing Quartzite
Metamorphic
Chalk
Calcareous Ooze (composed primarily of coccoliths)
Sedimentary Rock
Amazonite
KAlSi3O8 (Potassium Feldspar, variety of Microcline)
Mineral
Agate
Chalcedony (cryptocrystalline quartz)
Mineral