Diamond
Carbon (C)
mineral
Category
Granite
Browse granite specimens identified by the Rock Identifier community.
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Vesicular Basalt
Extrusive Basalt (Mafic Silicate)
igneous
Vesicular Basalt with Quartz/Chalcedony
Vesicular Basalt (primarily Plagioclase, Pyroxene, and Olivine with SiO2 infill)
igneous
Barite Rose on Marcasite
Barium Sulfate (BaSO4) on Iron Sulfide (FeS2)
mineral
Banded Iron Formation (BIF) / Tiger Iron
Magnetite / Hematite / Chert (SiO2 + Fe2O3/Fe3O4)
sedimentary
Basalt with Iron Oxidation
Extrusive Mafic Igneous Rock (composed of Plagioclase and Pyroxene)
igneous
Blue Sphalerite (likely dyed or treated Druzy Quartz/Agate)
Zinc Sulfide (ZnS) or Silicon Dioxide (SiO2) with trade-name enhancement
Mineral
Psilomelane (Manganese Ore)
Psilomelane (Ba,H2O)2Mn5O10
mineral
Quartzite
Quartzite (Primary mineral: SiO2)
Metamorphic
Quartzite
Quartzite (SiO2)
metamorphic
Quartzite
Quartzite (Primary mineral: Silicon Dioxide, SiO2)
metamorphic
Quartzite
Quartzite (SiO2)
metamorphic
Khondalite
Garnet-Sillimanite-Graphite Gneiss
metamorphic
Vesicular Basalt (Amygdaloidal)
Amygdaloidal Basalt (Mafic volcanic rock)
igneous
Diamond
Carbon (C)
mineral
Colorless Gemstone (possibly Diamond or Cubic Zirconia)
C (Diamond) or ZrO2 (Cubic Zirconia)
gemstone
Barite
Barium Sulfate (BaSO4)
mineral
Weathered Basalt with Iron Staining
Aphanitic Mafic Volcanic Rock
igneous
Basalt River Cobble
Basalt
igneous
Cubic Zirconia (CZ)
Cubic Zirconium Dioxide (ZrO2)
mineral (synthetic)
Tanzanite
Blue Zoisite (Ca2Al3(SiO4)(Si2O7)O(OH))
mineral
Barite
Barium Sulfate (BaSO4)
mineral
Sodalite
Na8(Al6Si6O24)Cl2
mineral
Sodalite
Na8(Al6Si6O24)Cl2
mineral
Quartzite
Metamorphosed Quartz Sandstone (SiO2)
metamorphic
Garnet in Matrix
Almandine or Spessartine Garnet in Quartz/Schist Matrix (X3Al2(SiO4)3)
metamorphic
Tiger Diamond / Hematite-infused Quartzite
Silicified Hematite-Rich Quartzite (SiO2 + Fe2O3)
metamorphic
Basalt (Weathered)
Extrusive mafic volcanic rock
igneous
Diamond (or high-refractive faceted gemstone)
Carbon; C
mineral
Basalt with Iron Oxidation (Lattice/Veined)
Mafic Volcanic Rock (principally Plagioclase and Pyroxene)
igneous
Rough Corundum (Sapphire/Ruby mixture)
Corundum (Aluminum Oxide, Al2O3)
mineral
Ironstone with Limonite/Goethite coating
Ferruginous Sedimentary Rock (contains Limonite FeO(OH)·nH2O)
sedimentary
Celestine (Celestite)
Strontium sulfate (SrSO4)
mineral
Gold Nugget / Gold-bearing Quartz
Native Gold (Au)
mineral
Coquina
Bioclastic Limestone (composed primarily of CaCO3)
sedimentary
Banded Iron Formation (BIF)
Magnetite-hematite-chert formation
sedimentary
Diamond
Diamond (C)
Mineral
Tanzanite (Blue Zoisite)
Ca2Al3(SiO4)(Si2O7)O(OH) + (V) - Vanadium-bearing Zoisite
mineral
Quartz-bearing Ore (likely Gold-bearing Quartz)
Quartz (SiO2) with potential sulfide mineralization (Pyrite/Arsenopyrite)
mineral/hydrothermal
White Topaz
Aluminum Silicate Fluoride Hydroxide; Al2SiO4(F,OH)2
mineral
Yellow Sapphire
Corundum (Al2O3)
mineral
Sandstone (River Pebble)
Arenite (SiO2 based)
sedimentary