Banded Agate (Tumbled)
Agate (Silicon Dioxide, SiO2 - Cryptocrystalline Quartz)
mineral
Category
Industrial Byproduct
Browse industrial byproduct specimens identified by the Rock Identifier community.
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River Quartz Pitting/Cobble
Silicon Dioxide (SiO2)
mineral
Milky Quartz Pebble
Quartz (Silicon Dioxide, SiO2)
mineral
Diamond (Set in jewelry)
Cubic Carbon (C)
mineral
Chert
Microcrystalline silica (SiO2)
sedimentary
Bismuth Crystal
Bismuth (element symbol Bi, atomic number 83)
mineral
Quartzite
Quartzite (primarily SiO2)
metamorphic
Diamond
Diamond (a metastable allotrope of carbon, C)
Mineral
Glauconitic Sandstone (Greensand)
Glauconitic Sandstone (Iron-potassium phyllosilicate mineral: (K,Na)(Fe3+,Al,Mg)2(Si,Al)4O10(OH)2)
sedimentary
Pink Granite
Phaneritic intrusive felsic igneous rock
igneous
Bauxite
Bauxite (principal ore of aluminum, primarily Al(OH)3)
sedimentary
Granite
Phaneritic Plutonic Felsic Rock
igneous
Granite Pebble
Felsic Plutonic Rock (primarily Quartz, Feldspar, and Mica)
igneous
Diamond
Carbon (C)
mineral
Scoria (Red Lava Rock)
Scoria (Vesicular Basalt/Andesite)
igneous
Chondrite Meteorite
Stony Meteorite (Ordinary Chondrite)
meteorite
Green Fluorite
Calcium Fluoride (CaF2)
mineral
Weathered Basalt with Iron Staining
Aphanitic Mafic Volcanic Rock
igneous
Chert (potentially Jasper/Common Opal mixture)
Microcrystalline Quartz (SiO2)
sedimentary
Ruby
Corundum (Al2O3:Cr)
mineral
Chalcedony
Cryptocrystalline Quartz (SiO2)
mineral
Quartzite
Quartzite (primarily SiO2)
metamorphic
Quartz with Hematite Inclusions
Silicon Dioxide (SiO2) with Ferric Oxide (Fe2O3)
mineral
Diamond (Faceted)
Carbon (C) - Diamond
mineral
Anthracite Coal
Anthracite
metamorphic
Milky Quartz with Iron Staining
Silicon Dioxide (SiO2)
mineral
Rose Quartz with Feldspar Inclusions
Silicon Dioxide (SiO2)
mineral
Anthracite Coal
Anthracite
metamorphic
Orange Calcite
Calcium Carbonate (CaCO3)
mineral
Quartzite
Quartzite (SiO2)
metamorphic
Chert (Commonly known as Flint)
Microcrystalline Quartz (SiO2)
sedimentary
Chert / Jasper
Microcrystalline Quartz (SiO2)
sedimentary
Anthracite Coal
Anthracite (Carbon-rich metamorphic coal)
metamorphic
Mica Schist
Medium-grade regional metamorphic rock (composition varies)
metamorphic
Chert (Flint)
Chert (Cryptocrystalline Quartz, SiO2)
sedimentary
Rose Quartz
Silicon Dioxide (SiO2)
mineral
Quartzite Pebble
Quartzite (predominantly Silicon Dioxide - SiO2)
metamorphic
Milky Quartz (Water-Worn Pebble)
Quartz (Silicon Dioxide, SiO2)
mineral
Banded Flint (Polished Stripe Flint)
Silicon Dioxide (SiO2) - variety of Chert
sedimentary
Satin Spar (Selenite)
Gypsum (Calcium Sulfate Dihydrate) - CaSO4·2H2O
mineral
Olivine (Peridot)
Magnesium Iron Silicate ((Mg, Fe)2SiO4)
mineral
Pink Quartzite
Quartzite (SiO2 with iron oxide inclusions)
metamorphic