Ferro-slag (Leland Blue/Slag Glass)
Anthropogenic Vitreous Silica (Industrial Slag)
igneous
Category
Sedimentary Like (Industrial Composite)
Browse sedimentary like (industrial composite) specimens identified by the Rock Identifier community.
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Red Sandstone
Arenite (with Iron Oxide / Hematite cementation)
sedimentary
Bumblebee Jasper
Calcite with Arsenic and Sulfur inclusions
sedimentary
Banded Chert
Microcrystalline Quartz (SiO2)
sedimentary
Chert (potentially Jasper/Common Opal mixture)
Microcrystalline Quartz (SiO2)
sedimentary
Quartz Sand
Silicon Dioxide (SiO2)
sedimentary
Fluorite (Green Fluorite)
Calcium Fluoride (CaF2)
mineral
Synthetic Zinc/Polycarbonate Composite (Bey-specimen)
Zinc Alloy (Zamak 3) with Polycarbonate (C15H16O2)n Overlay
Anthropogenic Mineral Mimic
Mica Schist with Garnet inclusions
Mica Schist (primarily Muscovite and Biotite - KAl2(AlSi3O10)(OH)2)
metamorphic
Mica Schist
Mica Schist (composed mainly of Muscovite / Biotite, Quartz, and Feldspar)
metamorphic
Graphite Schist
C (Carbonaceous Schist)
metamorphic
Green Chert (Jasper)
Silicon Dioxide (SiO2)
sedimentary
Chert (Iron-stained)
Chert (Silicon Dioxide, SiO2)
sedimentary
Chalcedony (Smoky Quartz or Agate nodule fragment)
Silicon Dioxide (SiO2)
mineral
Chert (specifically Flint or Jasper variant)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Oyster Shell (Aragonite/Calcite)
Calcium Carbonate (CaCO3)
sedimentary
Greenschist
Greenschist (Chlorite-Epidote-Actinolite Schist)
metamorphic
Quartz / Common Opal Transition
Silicon Dioxide (SiO2)
mineral
Chert (Jasper)
Silicon dioxide (SiO2)
sedimentary
Quartz Geode in Sedimentary Matrix
Silicon Dioxide (SiO2) within a limestone/dolostone host
mineral
Magnetite (Iron Ore)
Magnetite (Fe3O4)
mineral
Chert (Jasper)
Microcrystalline Quartz (SiO2) with iron oxide impurities
sedimentary
Chert (and associated river cobbles)
Silicon dioxide (SiO2)
sedimentary
Chert (Flint)
Chert (Cryptocrystalline Silica/SiO2)
sedimentary
Orange Calcite
Calcite (Calcium Carbonate - CaCO3)
mineral
Garnet Gneiss
Gneiss containing almandine-pyrope garnet
metamorphic
Chert (Iron-stained)
Microcrystalline Quartz (SiO2)
sedimentary
Green Chert
Silicon Dioxide (SiO2)
sedimentary
Banded Chalcedony (Agate)
Chalcedony (SiO2) - Cryptocrystalline Quartz
mineral
Garnet in Schist/Gneiss Matrix
Almandine (Fe3Al2(SiO4)3) or Pyrope (Mg3Al2(SiO4)3)
metamorphic
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Marble
Recrystallized Calcite Rock (CaCO3)
metamorphic
Yellow Calcite (Polished)
Calcium Carbonate (CaCO3)
mineral
Gneiss (specifically Micaceous Gneiss)
Gneiss (High-grade Regional Metamorphic Rock)
metamorphic
Greywacke (River Pebble)
Greywacke sandstone with quartz veining
sedimentary
Garnet in Quartz Matrix
Almandine Garnet (Fe3Al2(SiO4)3) in Quartz (SiO2)
metamorphic
Red Sandstone
Clastic Sedimentary Rock (typically contains Quartz and Iron Oxide)
sedimentary
Chert (Jasper variety)
Silicon Dioxide (SiO2)
sedimentary
Anthracite Coal
Anthracite (Carbon-rich metamorphic coal)
metamorphic
Chert (Jasper)
Cryptocrystalline Quartz (SiO2)
sedimentary
Druzy Quartz (part of a Geode)
Silicon Dioxide (SiO2)
mineral
Sandstone
Arenite (primarily Quartz, SiO2)
sedimentary