Sandstone
Clastic Sedimentary 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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Sandstone / Quartzite
Sedimentary quartz arenite
sedimentary
Sandstone
Arenite (SiO2 primarily)
sedimentary
Copper Ore Specimen
Cupriferous Rock / Malachite-bearing ore
mineral
Hematite
Hematite (Fe2O3)
mineral
Garnet
Almandine/Pyrope Garnet (Silicate Mineral Group)
mineral
Rose Quartz
Silicon Dioxide (SiO2)
mineral
Labradorite (Larvikite variety)
(Na,Ca)(Al,Si)4O8 (Plagioclase Feldspar)
igneous
Polymict conglomerate
Clastic conglomerate, likely polymictic and matrix-supported
sedimentary
River Pebbles (Mixed Lithology)
Conglomerate clasts (Silica-rich and Metamorphic assemblages)
sedimentary
Que Sera Stone (Llanite)
Rhyolite containing blue quartz and feldspar
igneous
Labradorite
(Ca, Na)(Al, Si)4O8
mineral
Aquamarine (Tumbled)
Beryl (Be3Al2Si6O18)
mineral
Tumbled jasper, likely ocean or brecciated jasper
Microcrystalline quartz (SiO₂) with iron-oxide and other mineral impurities
mineral
Flint
Microcrystalline Quartz (SiO2)
sedimentary
Metallic sulfide-bearing ore, likely pyrite-rich rock
Pyrite (FeS₂), possibly mixed with quartz or other sulfides
mineral
Concrete with Exposed Aggregate
Anthropogenic conglomerate (Concrete)
man-made rock (sedimentary analogue)
Weathered limestone
Limestone, predominantly calcite (CaCO₃)
sedimentary
Weathered volcanic rock, likely andesite
Porphyritic andesite (tentative; image alone cannot confirm composition)
igneous
Limonite Concretion
Goethite/Limonite concretion (FeO(OH)·nH2O)
sedimentary
Botryoidal hematite-rich iron ore (probable)
Hematite, Fe₂O₃, possibly mixed with goethite/limonite
mineral
River Pebbles (Mixed Suite)
Mixed lithologies: Quartzite and Gneiss
metamorphic
Sandstone
Sedimentary Rock (Quartz Sandstone)
sedimentary
Leopardite
Quartz porphyry / Quartz monzonite with manganese oxide spots
igneous
Rhodonite
Manganese Silicate (Mn,Fe,Mg,Ca)SiO3
mineral
Mixed Chalcedony and Jasper Bracelet (possibly 'Ocean Jasper' or similar banded variety for brown beads, and blue/grey Chalcedony for the translucent beads)
Chalcedony (SiO2), Jasper (SiO2 with impurities)
Mineral (specifically a cryptocrystalline variety of Quartz)
Chakra Stone Bracelet
Mixed Mineral Assembly (Scoria, Amethyst, Lapis Lazuli, Turquoise/Howlite, Impression Jasper, Tiger's Eye, Carnelian, Red Jasper)
igneous, metamorphic, and sedimentary
Fossiliferous limestone, possibly a shell or bone fragment
Calcitic limestone; predominantly calcium carbonate (CaCO₃), likely calcite
sedimentary
Granite Pebble
Intrusive Igneous Rock
igneous
Mixed Quartz and Jasper Pebbles
Silicon Dioxide (SiO2)
Mineral
Pyrite and Calcite (or Barite) Specimen
Iron Sulfide (FeS2) with Calcium Carbonate (CaCO3)
mineral
Kambaba Jasper
Stromatolite (Fossilized Algae)
sedimentary
Blue-and-yellow sodalite-bearing rock (likely sodalite in nepheline syenite)
Sodalite, Na8(Al6Si6O24)Cl2, likely mixed with feldspar and/or nepheline
mineral
Magnetite-rich iron ore
Magnetite (Fe₃O₄), possibly mixed with hematite or metallic sulfides
mineral
Pyrite with Galena and Sphalerite on Matrix
Iron Sulfide (FeS2), Lead Sulfide (PbS), Zinc Sulfide (ZnS)
mineral
Jasper
Microcrystalline Quartz (SiO2)
mineral
Yellow Quartz (Citrine Quartzite)
Silicon Dioxide (SiO2)
mineral
Rose Quartz
Silicon Dioxide with trace inclusions (SiO2)
mineral
Quartz-rich pegmatite, with probable feldspar and mica
Granite/pegmatite assemblage: quartz (SiO₂), feldspar (KAlSi₃O₈–NaAlSi₃O₈–CaAl₂Si₂O₈), and mica
igneous
Fluorite
Fluorite (Calcium Fluoride, CaF2)
mineral
Quartz Crystal (specifically Rock Crystal)
Silicon Dioxide (SiO2)
mineral
Citrine
Silicon Dioxide (SiO2)
mineral