Chert / Yellow Jasper
Silicon Dioxide (SiO2)
sedimentary
Category
Industrial Byproduct
Browse industrial byproduct specimens identified by the Rock Identifier community.
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Iron Ore (Hematite/Goethite)
Ironstone (Fe2O3 / FeO(OH))
sedimentary
Anthracite Coal
Anthracite (Carbon based fossil fuel)
metamorphic
Small weathered fossil or mineral fragment
Indeterminate; possibly fossilized shell, bone, or a pale carbonate mineral
fossil
Likely fossilized shark tooth
Possibly *Carcharocles* or *Otodus* sp.; exact identification requires scale and detail
fossil
Peridot in Matrix
Olivine ((Mg,Fe)2SiO4)
mineral
Quartz in Matrix
Silicon Dioxide (SiO2) in host rock matrix
mineral
Yellow Calcite
Calcium Carbonate (CaCO3)
mineral
Diamond
Carbon (C)
gemstone
Quartzite pebble
Metamorphic Quartzite (SiO2)
metamorphic
Ferruginous Quartz
Silicon Dioxide (SiO2) with Iron Oxide inclusions
mineral
Agate
Chalcedony (SiO2)
mineral
Diamond (set in a eternity ring band)
Carbon (C)
gemstone
Sandstone (lithic/quartz variant)
Clastic sedimentary rock (SiO2 predominant)
sedimentary
Milky Quartz Boulder
Quartz (Silicon Dioxide, SiO2)
mineral
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Sandstone
Arenite (SiO2 principal)
sedimentary
Kimberlite with Diamonds
Kimberlite (ultramafic potassic igneous rock)
igneous
Quartzite Pebble
Quartzite (SiO2)
metamorphic
Quartz (Iron-Stained)
Crystalline Silicon Dioxide (SiO2)
mineral
Quartz (Agate/Chalcedony)
Silicon Dioxide (SiO2)
mineral
Chalcedony Pebble
Cryptocrystalline Quartz (SiO2)
mineral
Chert (Iron-Stained)
Chert (Silicon Dioxide, SiO2)
sedimentary
Red Garnet (likely Almandine)
Almandine (Fe3Al2(SiO4)3)
mineral
Peridot
Olivine ((Mg, Fe)2SiO4)
mineral
Magnetic Sand Grain / Magnetite Pellet
Magnetite (Fe3O4)
mineral
Jasper
Jasper (Silicon Dioxide, SiO2)
sedimentary
Quartz or possibly Jasper/Chert. Looks like a tumbled or water-worn stone.
SiO2 (Silicon Dioxide)
Mineral or Sedimentary (if chert)
Smoky Quartz with Feldspar
SiO2 (Quartz) with KAlSi3O8 (Potassium Feldspar)
mineral
Pumice
Pumice (a highly vesicular volcanic glass)
igneous
Aquamarine
Beryl (Be3Al2Si6O18)
mineral
Raw Diamond
Carbon (C)
mineral
Sandstone-based Concrete Fragment
Cementitious Composite with Sedimentary Aggregate
sedimentary (man-made/anthropogenic)
Bauxite (Laterite)
Hydrated aluminum oxides (Al2O3·nH2O)
sedimentary
Diamond (in Matrix)
Carbon (C)
mineral
Possible basaltic rock or meteorite candidate
Likely vesicular basalt; meteorite identification cannot be confirmed visually
igneous
Limonite (Iron Ore)
FeO(OH)·nH2O (Hydrated Iron Oxide)
mineral
Crushed Stone (Gravel/Aggregates)
Crushed rock aggregate (varied composition including Granite, Limestone, and Quartz)
sedimentary and igneous (mixed)
Banded Iron Formation (Jaspillite)
Banded Iron Formation (BIF)
sedimentary
Obsidian
Volcanic Glass (SiO2)
igneous
Limonite (Iron Ore)
Limonite (Hydrated iron oxide - FeO(OH)·nH2O)
mineral
Drill Core Samples (Varied Lithology)
Multi-lithological core samples (containing potential granite, marble, and phyllite/schist sequence)
igneous, sedimentary, and metamorphic