Garnet (Almandine/Pyrope series)
Garnet Group - X3Y2(SiO4)3
mineral
Category
Industrial Byproduct (Anthropogenic Material)
Browse industrial byproduct (anthropogenic material) specimens identified by the Rock Identifier community.
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Riverstone Quartzite (Iron-stained)
Quartzite (primarily SiO2 with Limonite/Goethite staining)
metamorphic
Pink Granite
Intrusive Igneous Rock (Granitic)
igneous
Basalt with Quartz/Calcite Veins
Basalt (Aphanitic Mafic Igneous Rock)
igneous
Basalt
Basalt
igneous
Pumice
Pumice (Volcanic glass with vesicular texture)
igneous
Granite
Granite
igneous
Pumice
Pumicite (Amorphous volcanic glass)
Igneous
Coal (Anthracite or Bituminous)
Carbon (C) with varying hydrocarbon and mineral impurities
sedimentary
Marble
Recrystallized Calcite (CaCO3)
metamorphic
Granite
Phaneritic Igneous Rock (composed mostly of Quartz, Feldspar, and Mica)
igneous
Quartzite
Quartzite (primarily SiO2)
metamorphic
Pink Granite
Granitoid (rich in Potassium Feldspar)
igneous
Vesicular Basalt
Extrusive Mafic Igneous Rock (primarily Plagioclase Feldspar and Pyroxene)
igneous
Kaolin Clay in Saprolite Profile
Kaolinite (Al2Si2O5(OH)4) within Weathered Pegmatite/Granite
sedimentary
Anthracite Coal
Anthracite
sedimentary
Quartzite
Quartzite (SiO2)
metamorphic
Iron Ore (Limonite and Hematite)
Goethite/Limonite (FeO(OH)·nH2O) and Hematite (Fe2O3)
mineral
Pumice
Pumicite
igneous
Basalt
Basalt (composition predominately plagioclase feldspar and pyroxene)
igneous
Pumice
Pumice (Amorphous volcanic glass)
igneous
Granite
Granite (phaneritic intrusive felsic igneous rock)
igneous
Sandstone
Arenite (SiO2 primarily)
sedimentary
Yellow chalcedony (likely citrine or iron-stained quartz)
Microcrystalline quartz, SiO₂; yellow coloration likely from iron oxides or included quartz varieties
mineral
Tumbled honey-colored chalcedony or quartzite
Microcrystalline quartz, SiO₂; exact identification requires testing
mineral
Plume Agate or Moss Agate
Agate (SiO2)
mineral
Iron Meteorite / Limonite-coated Meteorite / Iron Nodule
Iron-Nickel Alloy (Kamacite and Taenite) with weathering crust
meteorite
Uncertain small pale mineral fragment
Indeterminate; possibly calcite or a light-colored feldspar fragment
mineral
Dyed mineral cluster, likely calcite or aragonite
Calcite (CaCO₃) or aragonite (CaCO₃), artificially color-enhanced
mineral
Rounded gray-brown river cobble
Indeterminate lithology; possibly weathered quartzite, chert, or fine-grained sandstone
sedimentary
Tumbled unakite
Unakite (epidote + pink K-feldspar + quartz)
metamorphic
Uncertain small metallic-looking mineral/rock fragment
Indeterminate; possibly galena-bearing rock or metallic slag
mineral
Calcite–fluorite mineral specimen with iron-oxide staining
Calcite (CaCO₃), likely fluorite (CaF₂), with possible quartz and iron/manganese oxides
mineral
Orbicular jasper (likely ocean jasper)
Silica-rich microcrystalline quartz/chalcedony with iron-oxide and feldspar inclusions; commonly marketed as Ocean Jasper
mineral
Pegmatite (Graphic Granite / Granite Pegmatite)
Coarse-grained intrusive igneous rock (Felsic)
igneous
Agate
Silicon Dioxide (Chalcedony), SiO2
gemstone
Black Tourmaline
Schorl (NaFe2+3Al6(Si6O18)(BO3)3(OH)4)
mineral
Agate
Silicon dioxide (SiO2) - Chalcedony variety
sedimentary
Pegmatite
Igneous Pegmatite
igneous
Mica Schist
Metamorphic rock dominated by muscovite and/or biotite mica
metamorphic
Black Tourmaline
Schorl (NaFe2+3Al6(Si6O18)(BO3)3(OH)4)
mineral
Jasper
Microcrystalline Quartz (SiO2)
sedimentary