Granite
Intrusive Felsic Igneous Rock
igneous
Category
Sedimentary (Processed Mineral Product)
Browse sedimentary (processed mineral product) specimens identified by the Rock Identifier community.
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Amethyst and clear gemstone ring
Amethyst (purple quartz, SiO₂), likely set with colorless quartz or glass accents
gemstone
Weathered iron-rich rock fragment
Likely limonite/goethite-rich ironstone; exact identification requires testing
mineral
Quartz Pebble
Quartz (Silicon Dioxide, SiO2)
mineral
Banded Sedimentary Rock
Siliciclastic Sedimentary Rock
sedimentary
Quartzite
Quartzite (primarily SiO2)
metamorphic
Chert / Flint
Cryptocrystalline quartz (SiO2)
sedimentary
Likely graphite-rich schist or graphite-bearing metamorphic rock
Graphite (C) in a mica/quartz-rich matrix; exact rock name requires testing
metamorphic
Green Sea Glass
Man-made silicate glass (weathered)
sedimentary
Granite
Phaneritic plutonic rock (Quartz, Feldspar, Mica)
igneous
Goethite
Goethite (FeO(OH))
mineral
Granite
Phaneritic Igneous Rock (primarily Quartz, Feldspar, and Mica)
igneous
Beach Quartzite Pebble
Quartzite (primarily SiO2)
metamorphic
Quartz pebble
Silicon dioxide (SiO2)
mineral
Shale or Mudstone (Based on appearance)
Shale (fine-grained, laminated fissile sedimentary rock) / Mudstone (fine-grained, non-fissile sedimentary rock)
Sedimentary
Slag
Anthropogenic Vitrification Product / Silicate Slag
Anthropogenic (Man-made industrial byproduct)
Flint
SiO2 (Microcrystalline quartz / Chert)
sedimentary
Peacock ore (bornite/chalcopyrite), likely treated
Bornite, Cu₅FeS₄, and/or chalcopyrite, CuFeS₂
mineral
Pyrite (Fool's Gold)
Iron Sulfide (FeS2)
mineral
Faceted Quartz (Rock Crystal)
Crystalline Silicon Dioxide (SiO2)
gemstone
Tumbled blue-green stone, likely chrysoprase or dyed chalcedony
Cryptocrystalline quartz (SiO₂), possibly nickel-bearing chrysoprase; exact identification requires testing
gemstone
Pyrite
Iron Sulfide (FeS2)
mineral
Goldstone (blue/black aventurine glass)
Man-made aventurine glass; silica glass containing metallic copper or other glittering inclusions
mineral
Quartz Pebble
Silicon Dioxide (SiO2)
sedimentary
Blue Apatite
Apatite (Calcium Phosphate) - Ca5(PO4)3(F,Cl,OH)
mineral
Blue kyanite crystal fragment
Kyanite — Al₂SiO₅
mineral
Yellow Quartz (Citrine/Yellow Jasper mix)
Silicon Dioxide (SiO2) with iron oxide inclusions
mineral
Sulfur
Sulfur (S)
mineral
Chrysoprase
Chalcedony (cryptocrystalline SiO2 variety)
Mineral
Milky quartz pebble
Quartz (SiO₂), commonly called milky quartz
mineral
Magnetite
Magnetite (Fe3O4)
mineral
Milky quartz vein rock
Quartz (SiO₂), likely massive vein quartz with minor iron staining or host-rock inclusions
mineral
Quartz pebble
Silicon dioxide (SiO2)
mineral
Quartz Pebble
Silicon Dioxide (SiO2)
sedimentary
Chalcedony (likely carnelian/agate beads or rounded grains)
Microcrystalline quartz, SiO₂; chalcedony varieties
mineral
Metal Chain Belt with Square Plates
Not applicable (man-made)
Man-made Object (Metalwork)
Iron-rich weathered rock (probable limonite/goethite)
Limonite, a mixture dominated by goethite (FeO(OH)) and related hydrated iron oxides
mineral
Mixed Rock Collection
Polymineralic aggregate
sedimentary
Pumice
Felsic volcanic glass
igneous
Opal cabochon or opal-like decorative specimen
Hydrated amorphous silica, SiO₂·nH₂O; likely synthetic or assembled opal material
gemstone
Pumice
Pumice
igneous
Blue slag-like mineral specimen, possibly bornite or chalcopyrite
Tentatively bornite (Cu5FeS4) or iridescent chalcopyrite (CuFeS2)
mineral