Agate
Chalcedony (SiO2)
mineral
Category
Sedimentary Or Igneous (Host Environment)
Browse sedimentary or igneous (host environment) specimens identified by the Rock Identifier community.
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Turquoise in Matrix
Hydrated phosphate of copper and aluminum (CuAl6(PO4)4(OH)8·4H2O)
mineral
Red Garnet Gemstone
Pyrope-Almandine Garnet (Mg3Al2(SiO4)3 to Fe3Al2(SiO4)3)
gemstone
Pyrite-bearing schist or quartzite
Micaceous quartz-rich metamorphic rock with pyrite (FeS₂)
metamorphic
Brachiopod Fossil in Sedimentary Rock
Phylum Brachiopoda fossil imprint in sedimentary matrix
fossil
K2 Jasper (K2 Granite)
Azurite in Granite (Biotite Granite with Azurite inclusions)
igneous
Quartz Pebble with Host Rock / Schist Matrix
Silicon Dioxide (SiO2) with Metamorphic Host Rock
sedimentary
Rounded quartz-rich river pebble
Likely quartz arenite or quartz-rich sandstone; exact identification requires testing
sedimentary
Jasper and Chalcedony Nodule
Silicon Dioxide (SiO2) - Microcrystalline Quartz
sedimentary
Basalt with Mineral Vein (Cobble)
Basalt (with likely Quartz/Calcite vein)
Igneous
Metallic sulfide mineral fragment, likely galena
Galena (lead sulfide, PbS), tentative identification
mineral
Flint / Chert Nodules in Limestone
Cryptocrystalline Quartz (SiO2) within Carbonate Rock
sedimentary
Quartz-veined metamorphic rock, likely schist or gneiss
Quartz–feldspar–mica rock; exact identification requires testing
metamorphic
Fossil shell
Likely a fossilized marine bivalve shell; exact taxon is indeterminate from the image.
fossil
Sandstone Concretion
Sedimentary concretion
Sedimentary
Gneiss with Quartz Veining
Gneiss (High-grade regional metamorphic rock)
metamorphic
Pyrite in Shale
Iron Disulfide (FeS2) in Argillaceous Shale
sedimentary
Shale or slate fragment
Fine-grained phyllosilicate rock, likely slate (metamorphosed shale)
metamorphic
Fossilized Insect in Nodular Matrix
Invertebrata / Insecta fossil in sedimentary concretion
fossil
Pyrite on Limestone
Iron Disulfide (FeS2) in Calcium Carbonate (CaCO3) matrix
sedimentary (matrix) / mineral (inclusion)
Weathered granite pebble
Granite, mainly quartz, feldspar, and mica; approximate composition SiO₂-rich continental crust
igneous
River Pebbles (Basalt and Graywacke/Limestone)
Mafic Volcanic Rock / Impure Sandstone
igneous and sedimentary
Rounded sandstone pebble
Quartz-rich sandstone (composition cannot be confirmed from the image)
sedimentary
Weathered schist or gneiss boulder
Micaceous quartz-feldspar schist/gneiss; exact identification is limited by the photograph
metamorphic
Orca Agate
Chalcedony (SiO2) with various inclusions
mineral
Silver-colored mica schist
Muscovite–quartz schist, possibly with biotite
metamorphic
Quartz Geode
Silicon Dioxide (SiO2)
mineral
Chert with Quartz Vein
Silicon dioxide (SiO2)
sedimentary
Chert (Jasper/Flint variety)
Silicon Dioxide (SiO2)
sedimentary
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Pyrite in Slate or Shale
Iron Sulfide (FeS2) in Argillaceous Matrix
mineral
Milky quartz
Quartz (silicon dioxide, SiO₂), likely a massive vein-quartz specimen
mineral
Polished malachite
Malachite, Cu₂CO₃(OH)₂
mineral
Weathered igneous pebble, likely basaltic andesite
Fine-grained mafic to intermediate volcanic rock; chiefly plagioclase feldspar, pyroxene, and possibly olivine or magnetite
igneous
Veined Limestone (Micrite) with Quartz/Calcite Veins
Calcium Carbonate (CaCO3) with Silicate or Carbonate inclusions
sedimentary
Quartz-rich sandstone (possibly arkosic sandstone)
Clastic sandstone composed mainly of quartz (SiO₂), with feldspar and mica fragments cemented by silica or carbonate
sedimentary
Druzy Quartz on Matrix
Silicon Dioxide (SiO2) on host rock
mineral
Turquoise
Turquoise, CuAl6(PO4)4(OH)8·4H2O
mineral
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Basalt and Quartz Pebble
Basalt (Igneous) and Quartzite/Quartz (SiO2) pebble
igneous and sedimentary
Rounded gray pebble
Indeterminate; likely a water-worn silicate or carbonate pebble
sedimentary
Milky Quartz Vein in Host Rock
Silicon Dioxide (SiO2)
Mineral