Sandstone Pebble
Sandstone (SiO2 rich clastic rock)
sedimentary
Category
Mixed (Predominantly Sedimentary And Igneous)
Browse mixed (predominantly sedimentary and igneous) specimens identified by the Rock Identifier community.
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Dyed Dalmatian Stone (Dalmatian Jasper)
Aplite (predominantly quartz, feldspar, and arfvedsonite)
igneous
Rose Quartz
Silicon Dioxide (SiO2) with trace amounts of titanium, iron, or manganese
gemstone
Moonstone with Black Tourmaline
Orthoclase (KAlSi3O8) with Schorl inclusions
mineral
Pegmatite
Igneous Pegmatite
igneous
Costume Jewelry Gemstones (Emerald-imitation and semi-precious beads)
BeCuAl6Si6O18 (Beryl structure), frequently simulated by glass or synthetic spinel
mineral
Carnelian (Chalcedony)
Silicon Dioxide (SiO2)
mineral
Weathered limestone fragment
Limestone, predominantly calcite (CaCO₃)
sedimentary
Bauxite
Bauxite (Al(OH)3 mixed with Fe2O3 and clay minerals)
sedimentary
Ironstone Concretion (Moqui Marble)
Iron Oxide Concretion (Fe2O3 / FeO(OH) mixed with SiO2)
sedimentary
Citrine
Quartz (Silicon Dioxide - SiO2)
mineral
Tumbled labradorite beads
Labradorite, a calcium-rich plagioclase feldspar (approximately (Ca,Na)(Al,Si)₄O₈)
mineral
Sandstone Pebble
Sedimentary Rock (Quartzose Sandstone)
sedimentary
Sandstone with Quartz Vein
Quartzose Sandstone with Hydrothermal Quartz
sedimentary
Vesicular basalt (likely weathered scoria)
Basaltic scoria; predominantly calcium-rich plagioclase, clinopyroxene, and iron-magnesium oxides
igneous
Granitic Gneiss
Gneiss (Metamorphic rock predominantly containing quartz, K-feldspar, and plagioclase)
metamorphic
Hematite-rich ironstone concretion
Hematite (Fe₂O₃), likely mixed with goethite/limonite and silica
mineral
Quartz (River Pebble)
Quartz (Silicon Dioxide, SiO2)
mineral
Rose Quartz Sphere
Silicon Dioxide (SiO2)
mineral
Anthracite Coal
Carbon (with organic impurities)
sedimentary
Kambaba Jasper (Crocodile Jasper)
Stromatolitic Rhyolite/Jasper (SiO2)
sedimentary
Himalayan Pink Salt (Halite)
Halite (Sodium Chloride, NaCl)
sedimentary
Obsidian and Phantom Quartz
Volcanic Glass (SiO2 + MgO + Fe3O4) and Crystalline Quartz (SiO2)
igneous and mineral
Blue Lace Agate
Silicon Dioxide (SiO2)
mineral
Amazonite
Microcline (KAlSi3O8)
mineral
Unakite
Unakite (altered granite)
metamorphic
Unakite
Epidotized Granite
metamorphic
Ferruginous Sandstone (with Laterite)
Ferruginous Arenite (FeO(OH)·nH2O)
sedimentary
Granite Pebble with Quartz/Feldspar Vein
Intrusive Felsic Igneous Rock (Granite)
igneous
Malachite with Chrysocolla
Copper carbonate hydroxide (Cu2CO3(OH)2) and Hydrated copper silicate (Cu,Al)2H2Si2O5(OH)4·nH2O
mineral
Sandstone
SiO2 (predominantly quartz sand)
sedimentary
Sandstone Pebble
Sedimentary Rock (Quartzose Sandstone)
sedimentary
Coarse-grained granite or granitic gneiss
Granite; predominantly quartz, potassium feldspar, plagioclase, and dark biotite/hornblende
igneous
Granite
Intrusive Igneous Rock
igneous
Sandstone
Sedimentary Rock (Quartz Sandstone)
sedimentary
Crazy Lace Agate
Silicon Dioxide (SiO2)
sedimentary
Iron Ore / Hematite Rock
Iron oxide (primarily Hematite, Fe2O3)
mineral
Banded Agate (Orca Agate)
Silicon Dioxide (SiO2) - Chalcedony variety
mineral
Scoria
Extrusive Mafic Volcanic Rock
igneous
Citrine
Silicon Dioxide (SiO2) with iron impurities
mineral
Tumbled jasper and agate assortment
Microcrystalline quartz (chalcedony), SiO₂, with iron-oxide and other mineral impurities
mineral
Limestone
Sedimentary Calcium Carbonate (CaCO3)
sedimentary