Yellow chalcedony (likely lemon agate or yellow jasper)
Microcrystalline quartz, SiO₂; possibly iron-bearing jasper or chrysoprase-like chalcedony
mineral
Category
Sedimentary (Processed Mineral Product)
Browse sedimentary (processed mineral product) specimens identified by the Rock Identifier community.
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Shale (Ferruginous)
Laminated Mudrock (Siliciclastic Sedimentary Rock)
sedimentary
Likely tumbled jasper or iron-rich chert
Microcrystalline quartz (SiO₂), potentially hematite/goethite-bearing
mineral
Sulfur
Native Sulfur (S)
mineral
Purpurite
Purpurite (MnPO4)
mineral
Sandstone (Ferruginous)
Arenite (primarily SiO2 with Fe2O3 staining)
sedimentary
Hematite
Ferric Oxide (Fe2O3)
mineral
Red Hematite
Iron(III) oxide (Fe2O3)
mineral
Hematite
Iron(III) oxide (Fe2O3)
mineral
Specular Hematite
Specularite (Iron Oxide, Fe2O3)
mineral
Sandstone
Clastic Sedimentary Rock
sedimentary
Tumbled quartz (likely milky/rose quartz)
Quartz, silicon dioxide (SiO₂)
mineral
Hematite / Goethite (Iron Ore)
Iron Oxide (Fe2O3 / FeO(OH))
mineral
Likely marble (calcite-rich metamorphic rock)
Calcite marble, composed mainly of calcite (CaCO₃); identification is provisional from the image
metamorphic
Hematite
Iron(III) oxide (Fe2O3)
mineral
Likely hematite-rich ironstone or metallic mineral fragment
Hematite (Fe₂O₃), possibly with magnetite (Fe₃O₄) or metallic iron
mineral
Iron Slag
Anthropogenic Iron Silicate
industrial byproduct
Selenite (satin spar gypsum)
Gypsum, CaSO₄·2H₂O; fibrous variety known as satin spar
mineral
Amethyst and mixed gemstone bracelet
Amethyst: purple quartz, silicon dioxide (SiO₂); likely accompanied by other quartz or decorative mineral beads
gemstone
Tumbled tiger’s eye
Tiger’s eye (chatoyant quartz), SiO₂, typically pseudomorphic quartz after crocidolite
mineral
Asphalt (Aggregate)
Bituminous macadam / Concrete Aggregate
sedimentary
Quartz
Silicon Dioxide (SiO2)
mineral
Shale (Beach-worn)
Laminated Pelite (primarily clay minerals and quartz)
sedimentary
Hematite
Hematite (Fe2O3)
mineral
Quartz-rich pegmatite with iron-stained quartz
Quartz (SiO₂) in granitic pegmatite, likely with feldspar and iron-oxide staining
igneous
Hematite
Iron(III) oxide (Fe2O3)
mineral
Hematite
Iron(III) oxide (Fe2O3)
mineral
Banded sandstone pebble
Lithic or quartz-rich sandstone; exact composition requires testing
sedimentary
Cullet Glass (Industrial Slag Glass)
Amorphous Silica (SiO2) with metallic oxide impurities
Man-made byproduct (often mistaken for Obsidian or Emerald)
Gold (Processed)
Gold (Au)
Metal (Elemental Mineral)
Hematite (Iron Ore Boulder)
Hematite (Fe2O3)
mineral
Hematite
Iron(III) oxide (Fe2O3)
mineral
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Hematite
Hematite (Fe2O3)
mineral
Tumbled quartz
Quartz (silicon dioxide, SiO₂)
mineral
Sandstone (lithic wacke/conglomerate mix)
Clastic Sedimentary Rock (SiO2 with lithic fragments)
sedimentary
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N/A
Hematite
Iron(III) oxide (Fe2O3)
mineral
Clear Quartz (Rock Crystal) Bead
Silicon Dioxide (SiO2)
mineral
Bituminous Coal
Organic sedimentary rock (humic coal)
sedimentary
Tumbled quartz (likely rose or milky quartz)
Quartz, silicon dioxide (SiO₂)
mineral
Dyed Agate Geode
Silicon Dioxide (SiO2) with artificial pigment
mineral