Tiger's Eye, Hematite, and Black Obsidian Bracelet
SiO2 (Tiger's Eye), Fe2O3 (Hematite), and 70-75% SiO2 (Obsidian)
mineral
Category
Sedimentary (Fossiliferous)
Browse sedimentary (fossiliferous) specimens identified by the Rock Identifier community.
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Jasper
Silicon dioxide (SiO2)
Mineral / Sedimentary
Satin Spar (Selenite)
Gypsum (Calcium Sulfate Dihydrate) - CaSO4·2H2O
mineral
Jasper
Silicon dioxide (SiO2) with iron inclusions
sedimentary
Blue Apatite
Fluorapatite (Ca5(PO4)3F)
mineral
Menilite Opal (Goddess Stone)
Menilite Opalescent Silex (Amorphous Hydrated Silica)
sedimentary
Marble
Recrystallized Calcite (CaCO3)
metamorphic
Gypsum (Alabaster variety)
Calcium sulfate dihydrate (CaSO4·2H2O)
mineral
Yellow Chalcedony (Agate/Chert)
Silicon Dioxide (SiO2) - Cryptocrystalline Quartz
sedimentary
Quartz (Small Fragment)
Silicon Dioxide (SiO2)
mineral
Banded Calcite (often sold as Caribbean Calcite or Honey Calcite)
Calcium Carbonate (CaCO3)
mineral
Chert (Flint variety)
Silicon Dioxide (SiO2)
sedimentary
Pyrite
Iron Sulfide (FeS2)
mineral
Satin Spar Selenite
Gypsum (Calcium Sulfate Dihydrate) - CaSO4·2H2O
mineral
Chert / Flint
Microcrystalline Quartz (SiO2)
sedimentary
Coal
Anthracite or Bituminous Coal (Carbon)
sedimentary
Sandstone
Arenite (composed mainly of SiO2)
sedimentary
Ferruginous Sandstone (River Pebble)
Clastic Sedimentary Rock (primarily SiO2 with Fe2O3 cement)
sedimentary
Sandstone with Iron Oxide Staining
Arenite with Limonite/Hematite alteration
sedimentary
Chert (White Chert or Flint)
Microcrystalline Quartz (SiO2)
sedimentary
Sandstone (likely Arkosic or Lithic Sandstone)
Arenite (SiO2 based with mineral inclusions)
sedimentary
Sandstone (Ferruginous)
Arenite (primarily SiO2 with iron oxide Fe2O3 cement)
sedimentary
Sandstone
Arenite
sedimentary
Sandstone
Arenite
sedimentary
Coal
Bituminous coal (Complex organic sedimentary rock)
sedimentary
Fossilized Trilobite or Mollusk Fragment
Phylum Arthropoda / Mollusca fossil in sedimentary matrix
fossil
Argillite
Argillite (compact, clay-rich sedimentary rock)
sedimentary
Coal
Carbonaceous sedimentary rock / Lignite to Bituminous coal
sedimentary
Chert (and Limestone Pebbles)
Silicon Dioxide (SiO2) / Sedimentary Microcrystalline Quartz
sedimentary
Sandstone
Sandstone (clastic sedimentary rock), primarily SiO2
sedimentary
Sandstone (Nut-stone / Cup-stone artifact)
Quartz Arenite / Worked Sedimentary Rock
sedimentary
Sandstone
Clastic sedimentary rock (primarily SiO2)
sedimentary
Sandstone
Clastic sedimentary rock (primarily SiO2)
sedimentary
Pyrite Concretion
Iron Sulfide (FeS2) in Sedimentary Matrix
sedimentary
Sandstone
Clastic sedimentary rock (primarily SiO2)
sedimentary
Ferruginous Sandstone
Clastic Sedimentary Rock (Iron-rich)
sedimentary
Sandstone
Clastic sedimentary rock (primarily SiO2)
sedimentary
Banded iron formation (ironstone)
BIF; hematite–magnetite–quartz/chert assemblage
sedimentary
Weathered basalt or iron-rich volcanic rock
Mafic volcanic rock, likely basalt; exact identification requires testing
igneous
Chert
Silicon Dioxide (SiO2)
sedimentary
Quartz Geode
Silicon Dioxide (SiO2)
mineral
Sandstone
Sandstone (SiO2-rich clastic sedimentary rock)
sedimentary