Hematite
Iron(III) oxide (Fe2O3)
mineral
Category
Industrial By Product
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Hematite
Iron(III) oxide (Fe2O3)
mineral
Hematite
Hematite (Fe2O3)
mineral
Hematite
Iron(III) oxide (Fe2O3)
mineral
Asphalt (Bituminous Pavement)
Bituminous mix (Aggregates with Bitumen binder)
sedimentary
Sodalite
Sodalite (Na8(Al6Si6O24)Cl2)
mineral
Quartz (Quartzite Pebble)
Silicon Dioxide (SiO2)
mineral
Polished greenstone (likely serpentine or altered basalt)
Serpentinite, mainly serpentine-group minerals (Mg₃Si₂O₅(OH)₄); exact identification requires testing
metamorphic
Quartz-bearing metamorphic rock, likely quartzite with dark mica/amphibole
Quartzite or quartz-rich schist; chiefly SiO₂ quartz with biotite, hornblende/amphibole, and iron-oxide staining
metamorphic
Weathered granite or granitic gneiss
Granite: quartz + feldspar + mica; possible gneissic variant
igneous
Weathered vesicular basalt
Basalt, chiefly plagioclase and pyroxene with secondary iron oxides and zeolite/calcite fillings
igneous
Quartz-rich pegmatite with mica
Granitic pegmatite; mainly quartz (SiO₂), feldspar, and muscovite/biotite mica, with possible sulfide or iron-oxide staining
igneous
Weathered dark volcanic rock, likely basalt
Basalt (plagioclase–pyroxene ± olivine), tentative identification
igneous
Weathered granite pebble
Granite, mainly quartz, feldspar, and mica; approximate composition SiO₂-rich continental crust
igneous
Hematite (specular hematite)
Hematite, α-Fe₂O₃ (iron(III) oxide)
mineral
Tumbled iron-rich concretion or ironstone pebble
Goethite–hematite-rich ironstone; commonly limonite (FeO(OH)·nH₂O) with hematite (Fe₂O₃)
sedimentary
Iron-rich weathered rock, possibly limonite/goethite-bearing ore
Limonite (hydrated iron oxides; chiefly goethite, FeO(OH), with hematite and other oxides possible)
mineral
Specular Hematite (Specularite)
Iron Oxide (Fe2O3)
mineral
Unakite
Altered Granite (Epidotized Granite)
metamorphic
Milky Quartz
Crystalline Silicon Dioxide (SiO2)
mineral
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Hematite
Iron(III) oxide (Fe2O3)
mineral
Limonite-goethite ironstone specimen
Goethite (α-FeO(OH)) with limonite, quartz, and iron oxides
mineral
Conglomeratic gravel / polymictic breccia
Polymictic rudite, likely anthropogenic or beach/stream gravel; composition varies
sedimentary
Pyrite with Limonite/Goethite Alteration (Pseudomorph)
Iron Sulfide (FeS2) transitioning to Hydrated Iron Oxides (FeO(OH)·nH2O)
mineral
Dyed Agate Geode
Silicon Dioxide (SiO2) with artificial pigment
mineral
Amethyst chips
Quartz, purple variety (SiO₂)
gemstone
Pumice
Pumice (volcanic glass)
igneous
Scoria
Vesicular Mafic Igneous Rock
igneous
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Red jasper (tumbled)
Jasper, microcrystalline quartz/chalcedony (SiO₂) colored mainly by iron oxides
mineral
Serpentine
Serpentinite (composed primarily of Mg3Si2O5(OH)4)
metamorphic
Pearl
Calcium Carbonate (mostly Aragonite), CaCO3 (with conchiolin)
mineral
Quartzite
Quartzite (primarily SiO2)
metamorphic
Chalk
Calcium Carbonate (CaCO3)
sedimentary
Vesicular volcanic rock (likely pumice)
Pumice, a highly vesicular volcanic glass, commonly rhyolitic to dacitic in composition
igneous
Likely blue-green kyanite crystal
Kyanite, Al₂SiO₅
mineral
Blue kyanite in matrix
Kyanite, Al₂SiO₅
mineral
Kyanite
Kyanite (Al₂SiO₅)
metamorphic
Tumbled milky quartz (probable)
Quartz, silicon dioxide (SiO₂)
mineral
Quartzite
Quartzite (Mostly SiO2)
metamorphic