Jasper and Quartz Pebble
Silicon dioxide (SiO2) microcrystalline quartz variety
sedimentary
Category
Mixed (Sedimentary, Igneous, And Metamorphic)
Browse mixed (sedimentary, igneous, and metamorphic) specimens identified by the Rock Identifier community.
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Graywacke
Graywacke Sandstone
sedimentary
Leopard Skin Jasper
Silicon Dioxide (SiO2) with mineral inclusions
sedimentary
Chalcedony Agate / Carnelian nodules in Matrix
SiO2 (Silicon Dioxide) with iron oxide inclusions
mineral
Mixed Polished Gemstones (Tumbled Stones)
Mixed Silicates and Oxides (SiO2, KAlSi3O8, Ca2Al2Be3Si6O22, etc.)
mineral
Yellow Jasper
Silicon Dioxide (SiO2) with iron oxide inclusions
sedimentary
Asphalt (Bituminous pavement fragment)
Artificial conglomerate / Bitumen-Aggregate mixture
sedimentary
Magnetite
Magnetite (Fe3O4)
mineral
Blue-andalusite (likely chiastolite-bearing metamorphic fragment)
Andalusite, Al₂SiO₅; possibly mixed with quartz/mica
metamorphic
Mixed gemstone bead bracelet
Likely rose quartz, amethyst, and possibly rhodonite or lepidolite beads
gemstone
Weathered rounded cobble
Indeterminate lithology; likely weathered sandstone or volcanic rock
sedimentary
Jasper Rose Quarts / Ferruginous Quartz
Silicon Dioxide (SiO2) with Hematite inclusions
sedimentary
Asphalt Concrete
Bituminous Concrete (Anthropic Rock)
sedimentary
Chert Pebble
Chert (Microcrystalline Quartz, SiO2)
sedimentary
Carved Stone Turtle
Mixed stone carving
carved stone
Chakra Crystal Bracelet
Mixed Mineral Assortment
gemstone
Granite (Pink/Alkali Feldspar Granite)
Plutonic Igneous Rock (Granite)
igneous
Conglomerate
Conglomerate (Sedimentary Clastic Rock)
sedimentary
Quartzite with Schist layers
Metamorphosed Quartz-rich Rock (Mixed Schist/Quartzite)
metamorphic
Granite Cobble
Phaneritic Felsic Igneous Rock (Granite)
igneous
Greywacke
Lithic Sandstone (Greywacke)
sedimentary
Rounded weathered stone, likely basaltic or volcanic rock
Indeterminate fine-grained mafic volcanic rock; possibly basalt or andesite
igneous
Quartz with Feldspar
Silicon Dioxide (SiO2) with Potassium Feldspar (KAlSi3O8)
igneous
Weathered granitic rock fragment
Likely granite or granodiorite; quartz–feldspar–mica aggregate
igneous
Glauconitic Sandstone
Glauconitic Sandstone (Quartz with Glauconite)
sedimentary
Mixed tumbled gemstone chips
Polychrome jasper, quartz/chalcedony, feldspar, and other silicate fragments (exact identification requires testing)
mineral
Quartz geode
Microcrystalline and crystalline quartz, SiO₂, likely with chalcedony and iron-oxide staining
mineral
Ruby zoisite (anyolite) beads
Ruby-bearing zoisite; zoisite Ca₂Al₃(SiO₄)₃(OH), with corundum ruby Al₂O₃
metamorphic
Yellow Jasper
Jasper (Silicon Dioxide with Iron Hydroxide impurities, SiO2 + FeO(OH))
sedimentary
Polished black stone, likely obsidian or dark basalt
Volcanic glass (obsidian), possibly basalt; exact identification requires testing
igneous
Pyrite
Iron Sulfide (FeS2)
mineral
Siltstone
Siltstone (composed of mixed silicate minerals and clay)
sedimentary
Common River Pebbles and Stones
Mixed natural stream gravel / siliciclastic pebbles
sedimentary
River Rock
Mixed composition, often quartzite, sandstone, or basalt
sedimentary
River Rocks and Pebbles
Mixed Silica-rich Sediments (SiO2 based)
sedimentary
Bauxite
Bauxite (Al2O3·2H2O mixed with iron oxides)
sedimentary
Granite and Mixed Landscape Gravel
Plutonic Igneous Rock / Weathered Alluvium
igneous
Chert (with Epidote/Quartz veining)
Cryptocrystalline silica (SiO2) with Epidote/Quartz inclusions
sedimentary
Schist (Micaceous Schist)
Micaceous schist (Mainly Muscovite/Biotite mixed with Quartz)
metamorphic
Concrete
Anthropogenic Sedimentary Rock (Hydrated Calcium Silicate)
sedimentary (anthropogenic / man-made)
Rounded gravel / river pebbles
Polymictic alluvial gravel, commonly quartz-, feldspar-, and lithic-rich clasts
sedimentary
Bumblebee Jasper
Anhydrite with Sulfur, Hematite, and Orpiment (SiO2/CaSO4 mixture)
sedimentary