Sea Glass
Man-made vitreous material (silica-based glass)
mineral
Category
Mineral Precipitate (Anthropogenic Context)
Browse mineral precipitate (anthropogenic context) specimens identified by the Rock Identifier community.
Learn about Mineral Precipitate (Anthropogenic Context) in the encyclopedia
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Asphalt concrete
Anthropogenic conglomerate
sedimentary
Concrete rubble
Anthropogenic conglomerate
sedimentary
N/A - Image does not contain a rock or mineral
Anthropogenic textile material
Non-geological
Chert (Flint) Artifact
Silicon Dioxide (SiO2)
sedimentary
Generic Pebble / Rock Fragment
Lithic fragment / Weathered rock pebble
sedimentary
Kidney Stone
Calcium oxalate, uric acid, struvite, or cystine
mineral
Slag
Anthropogenic glassy silicate
Mineral-like byproduct
Scoria
Scoria
Igneous
Aggregate Concrete
Anthropogenic Conglomerate (Technosol)
sedimentary
Chert (Flint Nodules)
Silicon Dioxide (SiO2)
sedimentary
Quartz (Bull Quartz)
Silicon Dioxide (SiO2)
mineral
Gold (Elemental Metal)
Gold (Au)
Mineral
Asphalt (Bituminous Concrete)
Bituminous mix / Anthropogenic conglomerate
man-made composite (lithified equivalent of sedimentary)
Unidentifiable embedded dark fragment
Indeterminate; possibly a dark silicate mineral or lithic inclusion
mineral
Slag
Anthropogenic Iron Silicate Glass
mineral
Slag Glass
Anthropogenic Amorphous Silicon Dioxide
mineral
Blue Slag Glass
Anthropogenic Amorphous Silicon Dioxide
mineral
Blue Glass or Slag Glass
Amorphous Silica (Anthropogenic Glass)
mineral
Uncertain fine-grained rock or mineral-bearing specimen
Indeterminate; possible quartz- or feldspar-bearing matrix with reflective grains
mineral
Ferruginous Sandstone (Ironstone)
Sandstone with Hematite/Goethite cement (SiO2 + FeO(OH))
sedimentary
Fossilized bone fragment
Fossil bone, composed chiefly of carbonate-fluorapatite (bioapatite)
fossil
Goethite pseudomorph after Pyrite
Goethite (FeO(OH)) pseudomorph after Pyrite (FeS2)
mineral
Sandstone or Quartzite with algae
Unknown specific, largely SiO2 with biological growth
sedimentary or metamorphic
Chert or flint flake
Cryptocrystalline microcrystalline quartz (SiO₂), likely chert/flint
sedimentary
Flint/chert projectile point
Microcrystalline quartz (SiO₂), archaeologically worked into a bifacial point
sedimentary
Polished green aventurine (likely)
Quartz, SiO₂, with green mica or other mineral inclusions; the photo alone cannot confirm the exact stone.
mineral
Banded iron formation fragment
Banded iron formation (BIF), composed mainly of hematite/magnetite and chert (SiO₂)
sedimentary
Unidentified small rock or mineral fragment
Indeterminate from the blurred image; possibly quartz-rich stone, feldspar, or weathered concrete-like geological material
mineral
Green Slag Glass
Amorphous Silica Glass (Anthropogenic)
Industrial byproduct (often mistaken for obsidian or mineral)
Sandstone (likely Ferruginous)
Sandstone (SiO2 with iron oxides)
sedimentary
Slag (Industrial Glass/Glassy Rock)
Anthropogenic Vitreous Material
igneous
Ferrocoke or Slag
Anthropogenic pyrometallurgical residue
igneous
Fordite
Anthropogenic paint-rock
mineraloid (human-made geological specimen)
Iron Slag
Anthropogenic Iron Silicate
industrial byproduct
Concrete with Exposed Aggregate
Anthropogenic conglomerate (Concrete)
man-made rock (sedimentary analogue)
Asphalt Concrete
Bituminous Concrete / Asphaltic Composite
not a natural rock (man-made composite)
Unidentified dark, flat specimen
Indeterminate; image resolution is insufficient for mineral identification
mineral
Rose Quartz
Silicon Dioxide (SiO2) containing trace amounts of titanium, iron, or manganese
mineral
Pyrite and Sunstone
Iron Sulfide (FeS2) and Plagioclase Feldspar ((Ca,Na)Al(Al,Si)Si2O8)
mineral
Weathered pale-blue rock fragment
Unidentified; the image does not show enough detail for a reliable geological identification
sedimentary
Anthropogenic Heat Source (Electronic/Industrial Interface)
Thermal IR emission (Electronic infrastructure)
not a rock or mineral