Fluorite (Rainbow Fluorite)
Calcium Fluoride (CaF2)
mineral
Category
Industrial By Product
Browse industrial by product specimens identified by the Rock Identifier community.
Pyrite
Iron Disulfide (FeS2)
mineral
Quartzite / Sandstone / Chert Mix
Silicon Dioxide (SiO2)
sedimentary and metamorphic
Chert (specifically Chert Nodule/Flint)
Chert (Silicon Dioxide, SiO2)
sedimentary
Yellow Agate
Agate (Varietal form of Chalcedony/Quartz, SiO2)
mineral
Almandine Garnet
Almandine (Fe3Al2(SiO4)3)
mineral
Chalcedony (Agate/Chert)
Microcrystalline Quartz (SiO2)
sedimentary
Chert (Nodule)
Microcrystalline or cryptocrystalline Quartz (SiO2)
sedimentary
Fuchsite
K(Al,Cr)2(AlSi3O10)(OH)2 (Chromium-rich Muscovite)
mineral
Anthracite Coal
Anthracite (high-rank coal / Carbon)
metamorphic
Ferruginous Quartz
Silicon Dioxide (SiO2) with Iron Oxide (Fe2O3/FeO(OH)) inclusions
mineral
Howlite
Howlite (Ca2B5SiO9(OH)5)
mineral
Ferruginous Quartz
Quartz (Silicon Dioxide) with Iron Inclusion (SiO2 + Fe2O3)
mineral
Chert (Jasper/Flint variant)
Silicon Dioxide (SiO2)
sedimentary
Sandstone (Ferruginous)
Arenite (primarily SiO2 with Fe2O3 inclusions)
sedimentary
Banded Iron Formation (BIF)
Banded Iron Formation
Sedimentary
Orange Calcite
Calcite (CaCO3)
Mineral
Unknown Organic Object (likely a berry or fruit)
Not applicable; this is not a geological specimen. If it were a cranberry, its scientific name would be Vaccinium macrocarpon; if a cherry, it would be Prunus avium or Prunus cerasus.
Organic Material (likely a fruit or berry)
Basalt
Mafic Volcanic Rock (primarily Plagioclase and Pyroxene)
Igneous
Rough Emerald (Beryl)
Emerald (Be3Al2(SiO3)6 with Cr/V impurities)
mineral
Ruby
Corundum (Al2O3 with Chromium traces)
mineral
Red Garnet
Garnet Group (e.g., Pyrope, Almandine, Spessartine, Grossular, Andradite, Uvarovite)
Mineral
Sea Glass (Frosted Glass)
Amorphous Silica (SiO2) with various metal oxide impurities
Man-made material (Anthro-lithic product)
Banded Chert (River Pebble)
Microcrystalline Quartz (SiO2)
sedimentary
Agate
Silicon Dioxide (SiO2) - Banded Chalcedony
mineral
Green Tourmaline (Verdelite)
Elbaite (Complex Borosilicate: Na(Li,Al)3Al6(BO3)3Si6O18(OH)4)
mineral
Olivine (Peridot)
Magnesium Iron Silicate (Mg,Fe)2SiO4
mineral
Fluorite (Rainbow Fluorite)
Calcium Fluoride (CaF2)
mineral
Diamond (as featured in jewelry)
Diamond (C - pure carbon)
mineral
Diamond (Set in Jewelry)
C (Native Carbon)
mineral
Fluorite (Green Fluorite)
Calcium Fluoride (CaF2)
mineral
Aquamarine
Beryl (Be3Al2Si6O18 with Fe2+ trace elements)
Mineral
Purple Agate (Dyed Chalcedony)
Silicon Dioxide (SiO2) - Microcrystalline Quartz
mineral
Anthracite Coal
Anthracite (Carbon Content: 86%-97%)
metamorphic
Anthracite Coal
Anthracite (Carbon-based organic sedimentary rock transitioned to metamorphic)
metamorphic
Iolite-bearing Gneiss (Cordierite)
Cordierite (Mg2Al4Si5O18) in Gneiss matrix
metamorphic
Rose Quartz
Silicon dioxide (SiO2) with trace impurities of titanium, iron, or manganese
mineral
Green Apophyllite and Stilbite on Quartz Cluster
Apophyllite-(K) (KCa4(Si8O20)(F,OH)·8H2O), Stilbite-Ca (NaCa4(Si27Al9)O72·28H2O), Quartz (SiO2)
Mineral
Anthracite Coal
Anthracite (Carbon-based sedimentary-derived metamorphic rock)
metamorphic
Biotite Schist
Biotite Schist
Metamorphic
Citrine
Quartz (SiO₂)
mineral
Milky Quartz
Silicon Dioxide (SiO2)
mineral