Petrified Wood
Silicified Wood (SiO2)
fossil
Category
Mineral, Specifically A Detrital Grain
Browse mineral, specifically a detrital grain specimens identified by the Rock Identifier community.
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Crushed Granite Gravel
Granite (Mainly Quartz, Feldspar, and Mica)
igneous
Sandstone (Ferruginous)
Arenite with Iron-Oxide cement
sedimentary
Quartzite
Quartzite (SiO2)
metamorphic
Sandstone (River Cobble)
Arenite
sedimentary
Quartz (Small Fragment)
Silicon Dioxide (SiO2)
mineral
Sunstone
Aventurine Feldspar ((Ca,Na)(Al,Si)4O8)
mineral
Orca Agate
Chalcedony (Microcrystalline Quartz, SiO2)
mineral
Sandstone (with potential Arkose/Lithic characteristics)
Arenite (Sedimentary rock composed of sand-sized grains)
sedimentary
Granite
Granite
Igneous
Diorite
Diorite (an intrusive igneous rock)
igneous
Ocean Jasper
Orbicular Jasper (variety of Chalcedony/Quartz, SiO2)
sedimentary
Amazonite
Potassium Feldspar (KAlSi3O8) with lead impurities
mineral
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Black Onyx (Tumbled)
Silicon Dioxide (SiO2)
mineral
Petrified Wood
Silicified Wood (primarily Quartz/SiO2)
mineral
Carnelian
Carnelian Chalcedony (SiO2 with Iron Oxide impurities)
mineral
Green Aventurine
Aventurine Quartz (SiO2 with inclusions of Fuchsite mica)
metamorphic
Amethyst
Amethyst (Silicon Dioxide - SiO2 with impurities of iron)
mineral
Rounded gray pebble
Indeterminate; likely a water-worn silicate or carbonate pebble
sedimentary
Yellow Calcite
Calcite (Calcium Carbonate, CaCO3)
mineral
Shale
Argillaceous Sedimentary Rock
sedimentary
Agate
Silicon dioxide (SiO2)
gemstone
Grey Agate
Silicon Dioxide (SiO2) - Microcrystalline Quartz
mineral
Granite
Phaneritic intrusive igneous rock (Quartz, Feldspar, Mica)
igneous
Pink Granite
Granite (Phaneritic igneous rock)
igneous
Chalcedony (Botryoidal Agate vein)
Chalcedony (Microcrystalline Quartz) - SiO2
mineral
Sandstone (Ferruginous)
Arenite with Iron Oxide matrix
sedimentary
Chert (specifically Jaspery Chert)
Microcrystalline Quartz (SiO2)
sedimentary
Black Shale
Argillaceous Chert/Shale
sedimentary
Chert (and Cherty Limestone)
Silicon Dioxide (SiO2) with impurities
sedimentary
Emerald
Beryl (Be3Al2Si6O18 with Chromium/Vanadium impurities)
mineral
Jasper
Silicon Dioxide (SiO2) with iron oxide impurities
sedimentary
Ruby (Raw/Rough)
Corundum (Al2O3 with Chromium trace)
mineral
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Ferruginous Quartz
Silicon Dioxide (SiO2) with Iron Oxide (Fe2O3) inclusions
mineral
Agate (Puddingstone style)
Silicon Dioxide (SiO2) with impurities
mineral
Agate (Chalcedony)
Agate (Silicon Dioxide - SiO2)
mineral
Agate
SiO2 (Silicon dioxide, cryptocrystalline quartz)
mineral
Sandstone
Arenite (SiO2 principal)
sedimentary
Quartz with Iron Staining
Silicon Dioxide (SiO2)
mineral
Shale fragment
Shale (clay mineral rich sedimentary rock)
sedimentary