Granite
Granite (Phaneritic Quartz-Feldspar Felsic Rock)
igneous
Category
Anthropogenic (Man Made Material Processed By Nature)
Browse anthropogenic (man made material processed by nature) specimens identified by the Rock Identifier community.
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Limestone
Sedimentary Calcium Carbonate (CaCO3)
sedimentary
Polished brecciated jasper pebble
Microcrystalline quartz (SiO₂), with iron-oxide inclusions
mineral
Diamond (set in jewelry)
Diamond (Carbon, C)
mineral
Diamond
Natural Carbon (C)
mineral
Picture Jasper
Silicon Dioxide (SiO2) with iron oxide and clay inclusions
sedimentary
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Brecciated jasper, possibly rainforest jasper
Jasper: microcrystalline to cryptocrystalline quartz, SiO₂, commonly containing hematite, goethite, chlorite, epidote, and other iron- and manganese-bearing minerals
gemstone
Diamond (Round Brilliant Cut)
Carbon (C)
gemstone
Green Calcite (Onyx Marble)
Calcium Carbonate (CaCO3)
mineral
Diamond
Carbon (C)
mineral
Diamond
Diamond (C)
mineral
Tumbled green jasper (probable serpentine-rich stone)
Jasper, microcrystalline quartz (SiO₂), possibly mixed with serpentine or chlorite
mineral
Silty Shale
Silty Shale (Fissile Sedimentary Rock)
sedimentary
Leopard Skin Jasper
Silicon Dioxide (SiO2) - Microcrystalline Quartz
sedimentary
Rhodonite
Rhodonite, manganese inosilicate — MnSiO₃; the specimen may include quartz, feldspar, and black manganese-oxide minerals in the matrix
mineral
Sandstone
Arenite
sedimentary
Sandstone
Arenite
sedimentary
Microcrystalline Quartz (Chert/Agate)
Silicon Dioxide (SiO2)
sedimentary
Tumbled purple agate (likely grape agate or amethystine chalcedony)
Microcrystalline quartz, SiO₂; purple coloration commonly from iron, manganese, or inclusions
mineral
Red Sandstone
Arenite (with iron oxide cement)
sedimentary
Diamond (faceted)
Carbon (C)
gemstone
Rough Diamond
Diamond (Native Carbon, C)
mineral
Sandstone
Arenite (SiO2 primarily)
sedimentary
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Chalcedony
Silicon Dioxide (SiO2)
sedimentary
Diamond
Diamond (pure carbon, C)
mineral
Rough Diamond
Diamond (pure Carbon, C)
mineral
Sandstone (Red Sandstone / River Stone)
Arenite (composed primarily of Quartz, SiO2, with Iron Oxide cementation)
sedimentary
Metallic sulfide ore, likely pyrite-bearing rock
Pyrite (FeS₂), possibly with marcasite or other sulfides
mineral
Yellow calcite crystal cluster with calcite fragment
Calcite, calcium carbonate (CaCO₃)
mineral
Dalmatian jasper
Dalmatian stone, typically a leucocratic alkali-feldspar-rich porphyritic igneous rock with black arfvedsonite or aegirine inclusions
igneous
Red Sandstone
Arenite (SiO2 based with Fe2O3)
sedimentary
Tumbled chalcedony or quartz-rich stone
Microcrystalline quartz, SiO₂; possibly pale chert or chalcedony
mineral
Diamond
Diamond (pure Carbon, C)
mineral
Diamond
Diamond (C)
Mineral
Tumbled blue-gray chalcedony (likely blue agate)
Chalcedony, microcrystalline quartz (SiO₂)
mineral
Limestone
Sedimentary Calcium Carbonate (CaCO3)
sedimentary
Quartzite Pebble
Quartzite (SiO2)
metamorphic
Sandstone (likely Arkosic)
Clastic Sedimentary Rock (primarily SiO2 with Feldspar)
sedimentary
Sandstone
Arenite
sedimentary
Tumbled gray-green metamorphic rock, likely serpentinite or chlorite schist
Serpentinite/chlorite-rich ultramafic metamorphic rock; commonly dominated by antigorite, lizardite, or chlorite with minor magnetite and talc
metamorphic