Queen Conch Shell (Biogenic Calcium Carbonate)
Aliger gigas (synonym Strombus gigas); Composition: Aragonite (CaCO3)
mineral
Category
Antropogenic (Man Made Industrial Byproduct)
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N/A
Weathered dark rock fragment
Indeterminate; possibly basalt or iron-rich volcanic rock
igneous
Iron meteorite fragment (probable)
Fe–Ni metallic meteorite, commonly octahedrite (kamacite–taenite)
meteorite
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Vesicular basalt (likely scoria)
Basaltic volcanic rock; mainly plagioclase, pyroxene, and often olivine, with abundant gas vesicles
igneous
Likely hematite-rich ironstone or metallic mineral fragment
Hematite (Fe₂O₃), possibly with magnetite (Fe₃O₄) or metallic iron
mineral
Amethyst (variety of Quartz)
SiO2 (Silicon Dioxide) with trace iron impurities
Mineral
Chert
Chert (Microcrystalline Quartz)
sedimentary
Likely black beach pebble
Undetermined; possibly basalt, chert, or dark slate
sedimentary
Likely galena-bearing ore
Galena (lead sulfide, PbS), possibly mixed with quartz or other sulfides
mineral
Quartz (in a rock matrix)
Quartz (SiO2)
mineral
Sandstone
Arenite (mostly SiO2)
sedimentary
Pearl
Calcium carbonate (CaCO3) - mainly Aragonite with Conchiolin
mineraloid
Sandstone
Arenite (with iron oxide cement)
sedimentary
Turquoise
CuAl6(PO4)4(OH)8·4H2O
mineral
N/A (Non-Geological Object)
N/A
Gypsum (Satin Spar / Alabaster variety)
Calcium Sulfate Dihydrate (CaSO4·2H2O)
mineral
Conglomeratic concrete or asphalt aggregate surface with dark bituminous chunks
Polymictic gravel aggregate; dark pieces likely bitumen/asphalt, not a natural rock
sedimentary
Quartzite
Metamorphic Quartzite (SiO2)
metamorphic
Limestone Pebble
Sedimentary Calcium Carbonate (CaCO3)
sedimentary
Sandstone
Arenite (SiO2 primarily)
sedimentary
Chalk
Carbonate rock (mainly CaCO3)
sedimentary
Quartzite
Metamorphic Quartz Rock (SiO2)
metamorphic
Pearl
Aragonite / Calcium Carbonate (CaCO3)
mineraloid
Marble
Marble (primarily Calcite, CaCO3 or Dolomite, CaMg(CO3)2)
Metamorphic Rock
Sandstone
Arenite (SiO2 composition dominant)
sedimentary
Quartzite
Metamorphic Quartzite (SiO2)
metamorphic
Basalt with Secondary Mineralization (Likely Zeolites or Calcite)
Aphanitic mafic volcanic rock with secondary mineral inclusions (e.g., CaAl2Si3O10·3H2O for Scolecite)
igneous
Red gemstone ring, likely garnet or synthetic ruby
Possibly almandine garnet (Fe₃Al₂(SiO₄)₃) or corundum/ruby (Al₂O₃); image alone cannot distinguish
gemstone
Chert (Flint)
Silicon Dioxide (SiO2)
sedimentary
Chalk
Micrite (primarily Calcium Carbonate or CaCO3)
sedimentary
Sandstone
Arenite (composed primarily of SiO2)
sedimentary
Pearl
Organic gemstone (Calcium carbonate - CaCO3)
mineral
Chert (variations include Flint)
Microcrystalline or cryptocrystalline Quartz (SiO2)
sedimentary
Quartzite
Metamorphic Quartzite (SiO2)
metamorphic
Sandstone
Arenite (SiO2, often with CaCO3 or Fe2O3 cement)
sedimentary
Quartzite
Metamorphic Quartzite (SiO2)
metamorphic
Sandstone (Quartzose)
Arenite (primarily SiO2)
sedimentary
Red Quartzite
Quartzite (Metamorphosed Quartz Arenite)
metamorphic
Quartzite
Metamorphic Quartz Rock (SiO2)
metamorphic
Sandstone (Quartzose)
Sandstone (SiO2 dominated)
sedimentary