Bay Scallop Shell
Argopecten irradians (Biogenic Calcium Carbonate / CaCO3)
sedimentary
Category
Sedimentary Like (Industrial Composite)
Browse sedimentary like (industrial composite) specimens identified by the Rock Identifier community.
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Pyrite
Iron Sulfide (FeS2)
mineral
Nickel
Nickel (Ni)
mineral
Polished red banded stone, likely rhodonite
Rhodonite — manganese inosilicate, MnSiO₃; possibly rhodochrosite or dyed quartz
mineral
Blue Banded Agate
Chalcedony (Silicon Dioxide, SiO2)
mineral
Schist
Mica Schist (Group of medium-grade metamorphic rocks)
metamorphic
Milky Quartz with Iron Staining
Silicon Dioxide (SiO2) with Limonite/Goethite
mineral
Ruby (Corundum)
Aluminum oxide (Al2O3) with Chromium traces
mineral
Olivine (Peridot)
Olivine (Mg, Fe)2SiO4
mineral
Marble
Metamorphosed Limestone (CaCO3)
metamorphic
Red jasper fragment
Jasper, microcrystalline quartz (SiO₂) colored chiefly by iron oxides
mineral
Brecciated jasper (likely ocean jasper or rhyolitic jasper)
Silica-rich volcanic breccia composed mainly of microcrystalline quartz/chalcedony (SiO₂), with iron-oxide staining and possible feldspar
igneous
Polished blue calcite sphere (tentative identification)
Calcite, CaCO₃; blue color generally results from trace impurities or inclusions
mineral
Rough Diamond
Diamond (C)
mineral
Concrete fragment with Aggregate
Anthropogenic Concrete with Calcarious and Siliceous Aggregate
sedimentary (anthropogenic/man-made)
Rough Gemstone Grains (Mixed Sapphires and Quartz)
Corundum (Al2O3) and Quartz (SiO2)
mineral
Aquamarine
Beryl (Be3Al2Si6O18)
mineral
Tumbled brown stone, likely jasper or iron-stained quartz
Microcrystalline quartz (SiO₂), possibly chalcedony/jasper with iron-oxide inclusions
mineral
Orbicular rhyolite (likely)
Rhyolite, a silica-rich volcanic rock; commonly quartz, alkali feldspar, plagioclase, and iron-rich alteration minerals
igneous
Quartzite
Quartzite (composed primarily of SiO2)
metamorphic
Garnet amphibolite / Metamorphic Rock
Garnet Amphibolite (Hornblende - Almandine schist/gneiss)
metamorphic
Olivine (Peridot)
Magnesium Iron Silicate (Mg,Fe)2SiO4
Mineral
Basalt
Extrusive Igneous Basalt (contains Plagioclase Feldspar and Pyroxene)
igneous
Rough Diamond
Diamond (pure carbon, C)
mineral
Quartz Vein in Host Rock
Silicon Dioxide (SiO2) in matrix
Mineral in Metamorphic/Igneous Host
Sandstone
Sandstone ( преимущественно SiO2 )
sedimentary
Basalt
Basalt (Aphanitic Mafic Volcanic Rock)
igneous
Yellow Quartz (Citrine Quartz)
Silicon Dioxide (SiO2)
mineral
Celestite
Strontium Sulfate (SrSO4)
mineral
Mica Schist
Schist (Muscovite/Biotite Schist)
metamorphic
Magnetite
Magnetite (Fe3O4)
Mineral
Quartzite
Quartzite (primarily SiO2)
metamorphic
Calcite
Calcite (CaCO3)
Mineral
Diamond (set in Gold)
Diamond (pure carbon, C)
mineral
Yellow Quartz (Citrine/Quartzite Pebble)
Silicon Dioxide (SiO2)
mineral
Diamond
Carbon (C)
mineral
Chert (Flint)
Chert (SiO2)
sedimentary
Sandstone
Arenite (major component SiO2)
sedimentary
Aquamarine
Beryl (Be3Al2Si6O18)
mineral
Geode (unopened) or Calcareous Nodule
Siliceous or Calcareous Concretion/Nodule
sedimentary
Banded Iron Formation (BIF)
Banded Iron Formation (predominantly Hematite, Magnetite, and Chert/Quartz)
sedimentary
Limestone
Calcium Carbonate (CaCO3)
sedimentary