Milky Quartz Pebble with Chert
Silicon Dioxide (SiO2)
mineral
Category
Industrial Byproduct (Often Mistaken For Obsidian Or Mineral)
Browse industrial byproduct (often mistaken for obsidian or mineral) specimens identified by the Rock Identifier community.
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Banded Chert
Chert (a microcrystalline variety of quartz, SiO2 with minor impurities)
Sedimentary
Bornite (Peacock Ore)
Bornite (Cu5FeS4)
mineral
Chalcedony (Common Agate)
Silicon Dioxide (SiO₂)
mineral
Asphalt / Bituminous Aggregate
Bituminous mixture (Hydrocarbon-based sediment)
sedimentary
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Sandstone (with biological crust)
Arenite (SiO2 based)
sedimentary
Quartz pebble
Silicon Dioxide (SiO2)
mineral
Garnet
Garnet Group (e.g., Almandine Fe3Al2(SiO4)3 or Pyrope Mg3Al2(SiO4)3)
mineral
Concretion
Various mineral compositions, typically carbonate or iron oxide cemented sediment
Sedimentary
Quartz (Milky/Chalcedony variety)
Silicon Dioxide (SiO2)
mineral
Cubic Zirconia (Faceted)
Zirconium dioxide (ZrO2)
mineral
Iron-stained Quartz
Silicon Dioxide with Iron Oxide (SiO2 + Fe2O3)
mineral
Smoky Quartz (Rough)
Silicon Dioxide (SiO2)
mineral
Green Calcite
Calcium Carbonate (CaCO3)
mineral
Pegmatite (Granitic)
Granite Pegmatite
igneous
Ruby
Corundum (Al2O3 with Chromium traces)
mineral
Quartzite
Quartzite (SiO2)
metamorphic
Sandstone Beach Pebble
Clastic Sedimentary Rock (primarily Quartz with Iron Oxide coating)
sedimentary
Amazonite
Amazonite (KAlSi3O8) - a variety of Microcline Feldspar
Mineral
Vesicular Basalt
Basalt (Mafic volcanic rock)
igneous
Schist
Schist (various compositions)
metamorphic
Epidote
{Ca2}{Al2Fe3+}(Si2O7)(SiO4)O(OH)
mineral
Limonite / Ironstone
Hydrated ferric oxide (FeO(OH)·nH2O)
mineral
Sandstone
Arenite
sedimentary
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Orange Calcite
Calcium Carbonate (CaCO3)
mineral
Quartz (Iron-stained or Orange Quartz)
Silicon Dioxide (SiO2)
mineral
Quartz Pebble (Chalcedony/Agate variety)
Silicon Dioxide (SiO2)
mineral
Vuggy Quartz / Chert
Silicon Dioxide (SiO2)
sedimentary
Green Fluorite (likely synthetic or heat-treated for jewelry)
Calcium Fluoride (CaF2)
mineral
Yellow Jasper
Silicon Dioxide (SiO2) with Goethite/Iron Oxide inclusions
sedimentary
Quartz pebble
Silicon Dioxide (SiO2)
mineral
Apache Tear (Obsidian)
Obsidian / Amorphous Volcanic Glass (primarily SiO2)
igneous
Sandstone (Ferruginous)
Arenite (with Iron Oxide cement)
sedimentary
Limonite (Iron Ore)
Limonite (̑FeO(OH)·nH₂O)
sedimentary
Quartz Geode in Sedimentary Matrix
Silicon Dioxide (SiO2) within a limestone/dolostone host
mineral
Chalcedony (Agate)
Cryptocrystalline Quartz (SiO2)
mineral
Orange Calcite
Calcium Carbonate (CaCO3)
mineral
Drill Core Samples (Varied Lithology)
Multi-lithological core samples (containing potential granite, marble, and phyllite/schist sequence)
igneous, sedimentary, and metamorphic
Ruby
Corundum (Al2O3 with Chromium traces)
mineral
Quartz (Beach Pebble)
Silicon Dioxide (SiO2)
mineral