Iron Slag
Iron Slag (Industrial Vitreous Material)
Mineral/By-product
Category
Mineralogical Specimen
Browse mineralogical specimen specimens identified by the Rock Identifier community.
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Banded Gneiss
Gneiss (complex metamorphic silicate rock)
metamorphic
Basalt pebble
Basalt
igneous
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Rhyolite Pebble
Rhyolite
igneous
Quartz (Tumbled)
Silicon Dioxide (SiO2)
mineral
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Milky Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Quartz Pebble
Crystalline Silica (SiO2)
mineral
Sandstone (likely Quartzose Sandstone)
Arenite (composed primarily of SiO2)
sedimentary
Quartzite River Rock
Quartzite (SiO2)
metamorphic
Fossilized Shark Tooth
Bioapatite (Calcium Hydroxyapatite) replacement
mineral
Gneiss
High-grade metamorphic rock (Gneiss)
metamorphic
Basalt River Cobble
Basalt
igneous
Chert (often called Flint when dark or worked)
Cryptocrystalline silica (SiO2)
sedimentary
Pink Granite
Phaneritic Felsic Igneous Rock (composed primarily of K-Feldspar, Quartz, and Plagioclase)
igneous
Quartz (Druzy/Macro-crystalline)
Silicon Dioxide (SiO2)
mineral
Granite
Granitoid
igneous
Banded Chert (River Cobble)
Microcrystalline Quartz (SiO2)
sedimentary
Devil's Toenail (Fossil Oyster)
Gryphaea arcuata (Calcium Carbonate, CaCO3)
sedimentary
Basalt River Pebble
Basalt (Aphanitic Mafic Igneous Rock)
igneous
Basalt
Basalt (Mafic volcanic rock)
igneous
River Cobble (Gneiss/Schist mix)
Foliated Metamorphic Rock (Gneissic/Schistose)
metamorphic
Granite Pebble
Felsic Intrusive Igneous Rock (composed of Quartz, Alkali Feldspar, and Plagioclase)
igneous
Yellow Quartzite Pebble
Quartzite (SiO2 with Iron Oxide staining)
metamorphic
Rhyolitic Tuff
Rhyolitic Tuff / Pyroclastic rock
igneous
Sandstone
Arenite
sedimentary
Granite Pebble
Phaneritic plutonic rock (Quartz, Feldspar, Mica)
igneous
Blue Banded Agate
Chalcedony (Silicon Dioxide, SiO2)
mineral
Basalt (River Stone)
Basalt
igneous
Chert (Yellow Jasper variant)
Microcrystalline Quartz (SiO2)
sedimentary
Chert (Arrowhead/Tool variety)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Chert (Jasper/Flint variety)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Granite Pebble
Granite
igneous
Red Jasper
Silicon Dioxide (SiO2) with iron oxide inclusions
sedimentary
Chert (Basanite / Flint)
Microcrystalline silica (SiO2)
sedimentary
Sandstone (likely Arkosic)
Clastic Sedimentary Rock (primarily SiO2 with Feldspar)
sedimentary
Limestone (with potential fossil inclusions)
Calcium Carbonate (CaCO3)
sedimentary
Basalt pebble
Basalt
igneous
Sandstone (likely Fossiliferous Sandstone)
Clastic sedimentary rock (primarily SiO2)
sedimentary