Shungite
Non-crystalline carbon (allotrope of carbon)
metamorphic
Category
Mineral And Sedimentary
Browse mineral and sedimentary specimens identified by the Rock Identifier community.
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Conglomerate
Conglomerate (clastic sedimentary rock)
sedimentary
Glacial Granite with Epidote
Granite featuring Epidote (Ca2(Al2,Fe3+)(SiO4)(Si2O7)O(OH))
igneous
Gneiss
Metamorphic Gneiss
metamorphic
Gneiss
Gneiss (High-grade Regional Metamorphic Rock)
metamorphic
Sandstone
Arenite (SiO2 based)
sedimentary
Garnet (likely Almandine)
Almandine Garnet, Fe3Al2(SiO4)3
mineral
Common Opal
Hydrated amorphous form of silica (SiO2·nH2O)
mineral
Ferruginous Sandstone
Arenite with Iron-Oxide Cement (SiO2 with Fe2O3/FeO(OH))
sedimentary
Sandstone with Liesegang Rings
Clastic Sedimentary Rock with Iron Oxide Precipitates (SiO2 + Fe2O3)
sedimentary
Chert (Flint)
Microcrystalline Quartz (SiO2)
sedimentary
Druzy Quartz on Limestone
Silicon Dioxide (SiO2)
mineral
Quartz (Milky Quartz)
Silicon Dioxide (SiO2)
mineral
Gneiss
Gneiss
metamorphic
Greywacke (River Slikenside)
Greywacke (Lithic Sandstone)
sedimentary
Sandstone (lithic wake/graywacke variety)
Arenite/Greywacke (SiO2 with lithic fragments)
sedimentary
Gneiss
Gneiss (High-grade Regional Metamorphic Rock)
metamorphic
Blue Apatite
Fluorapatite (Ca5(PO4)3F)
mineral
Clear Quartz (Rock Crystal)
Silicon Dioxide (SiO2)
mineral
Green Fluorite
Calcium Fluoride (CaF2)
mineral
Black Opal
Hydrated Silica (SiO2·nH2O)
mineral
Green Calcite
Calcite (CaCO3)
mineral
Sandstone
Arenite
sedimentary
Sandstone
Arenite (SiO2 primarily)
sedimentary
Sandstone
Arenite (composed primarily of SiO2)
sedimentary
Red Jasper (Chert)
Silicon Dioxide (SiO2) with iron oxide inclusions
sedimentary
Quartz Geode
Silicon Dioxide (SiO2)
sedimentary
Ironstone concretion
Siderite or Limonite concretion (FeCO3 or FeO(OH)·nH2O)
sedimentary
Sandstone Concretion
Arenaceous concretion (primarily SiO2 with Fe2O3 staining)
sedimentary
Ironstone Concretion
Siderite or Hematite Concretion (FeCO3 or Fe2O3)
sedimentary
Red Jasper
Jasper (Silicon Dioxide, SiO2)
sedimentary
Bivalve Fossil (Internal Mold/Steinkern)
Class Bivalvia (Fossilized Mold)
sedimentary
Geode
Crystalline Quartz (SiO2) within a nodule
sedimentary
Sandstone (Iron-stained)
Clastic sedimentary rock (SiO2 with Fe2O3 staining)
sedimentary
Sandstone Concretion
Sandstone (Sedimentary Rock) with silica or calcite cement
sedimentary
Sandstone (River Cobble)
Clastic Sedimentary Rock (primarily Quartz with Feldspar)
sedimentary
Sandstone (Ferruginous)
Arenite (primarily SiO2 with iron oxide Fe2O3 cement)
sedimentary
Pyrite on Limestone
Iron Disulfide (FeS2) in Calcium Carbonate (CaCO3) matrix
sedimentary (matrix) / mineral (inclusion)
Jasper
Silicon dioxide (SiO2)
sedimentary
Yellow Jasper
Silicon Dioxide (SiO2) with iron oxide inclusions
sedimentary
Carnelian
Chalcedony (cryptocrystalline quartz), SiO2 (Silicon Dioxide)
mineral
Gneiss (with Quartzite and Biotite)
Gneiss containing SiO2 (Quartz), K(Mg,Fe)3AlSi3O10(OH)2 (Biotite), and (K,Na,Ca)AlSi3O8 (Feldspar)
metamorphic