Apatite
Apatite group mineral (e.g., Fluorapatite - Ca5(PO4)3F, Chlorapatite - Ca5(PO4)3Cl, Hydroxylapatite - Ca5(PO4)3(OH))
mineral
Category
Anthropogenic (Man Made Artifact)
Browse anthropogenic (man made artifact) specimens identified by the Rock Identifier community.
Dark-colored Igneous Rock (likely Basalt or Diabase)
Basalt (extrusive igneous) or Diabase (intrusive igneous)
Igneous Rock
Turquoise
Turquoise (CuAl6(PO4)4(OH)8·4H2O)
mineral
Laterite
Laterite (no specific mineral formula as it's a rock type)
Sedimentary
Limestone
Sedimentary Calcium Carbonate (CaCO3)
sedimentary
Limestone (Weathered Aggregate)
Sedimentary Carbonate Rock (CaCO3)
sedimentary
Basalt
Basalt (Fine-grained extrusive igneous rock)
igneous
Sodalite
Sodalite (Na8(Al6Si6O24)Cl2)
mineral
Geode (Unopened)
Siliceous Septarian Concretion / Geode (SiO2)
sedimentary
Glauconitic Sandstone (Greensand)
Glauconitic Quartz Arenite (containing Glauconite, (K,Na)(Fe3+,Al,Mg)2(Si,Al)4O10(OH)2)
sedimentary
Basalt (River Stone)
Aphanitic Mafic Igneous Rock
igneous
Citrine
Quartz (SiO2) - specifically, a variety of macrocrystalline quartz
mineral
Red Jasper
Silicon Dioxide (SiO2) with Hematite inclusions
sedimentary
Quartzite
Quartzite (primarily SiO2)
metamorphic
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Pumice
Pumice (Amorphous volcanic glass)
igneous
Milky Quartz
Quartz (Silicon Dioxide - SiO2)
mineral
Basalt with Vesicles
Aphanitic Mafic Volcanic Rock (Basalt)
igneous
Quartzite Cobble
Quartzite (SiO2)
metamorphic
Milky Quartz
Quartz (Silicon Dioxide, SiO2)
mineral
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Grey Limestone Pebble
Limestone (Calcium Carbonate - CaCO3)
sedimentary
Milky Quartz with Iron Staining
Quartz (Silicon Dioxide, SiO2)
mineral
Quartzite
Quartzite (primarily SiO2)
metamorphic
Quartz Pebble
Quartz (Silicon Dioxide, SiO2)
mineral
Jasper or Chalcedony
Microcrystalline Quartz (SiO2)
sedimentary
Basalt Pebble
Basalt (Mafic Extrusive Igneous Rock)
igneous
Note: The image provided is a fabric sock, not a geological specimen.
Polyester-Cotton Blend with Elastane
Synthetic/Natural Fiber (Non-Geological)
Red Coral
Corallium rubrum (for precious red coral), although other species like Corallium japonicum and Paracorallium are also used.
Organic Gemstone (not a rock or mineral in the traditional sense, but bio-mineralized material)
Red Chalcedony (likely dyed)
Chalcedony (a variety of Quartz), SiO2
Mineral (Cryptocrystalline Quartz)
Marble
Metamorphosed Limestone/Dolomite
metamorphic
Unidentified Rock Fragment
Unknown
Rock
Sodalite
Sodalite (Na4Al3Si3O12Cl)
Mineral
Aragonite Star Cluster
Aragonite (Calcium Carbonate, CaCO3)
mineral
Blue Agate (Dyed)
Silicon Dioxide (SiO2)
Sedimentary (formed from silica deposits)
Tiger's Eye
Silicon dioxide (SiO2) with fibrous inclusions of crocidolite (riebeckite)
Mineral
Quartz (Druzy) in host rock
SiO₂ (Silicon Dioxide) as Quartz, with unspecified host rock components (likely silicates and iron oxides)
Mineral
Aventurine
Quartz (Aventurine variety)
Mineral
Pyrite (Fool's Gold)
Iron Sulfide (FeS2)
mineral
Basalt
Extrusive mafic igneous rock; primarily (Ca,Na)(Mg,Fe,Al,Si)2O6 with (Ca,Na)(Al,Si)4O8
igneous
Quartzite (Water-worn Pebble)
Metamorphosed Quartz Sandstone (SiO2)
metamorphic
Pumice
Pumicite
igneous