Kidney Stone
Calculus (Calcium oxalate/Calcium phosphate)
mineral
Category
Minerals
Browse minerals specimens identified by the Rock Identifier community.
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Lapis Lazuli (Low-grade)
Lapis Lazuli (Aggregate of Lazurite, Calcite, and Pyrite)
metamorphic
Unakite Epidote-Granite
Unakite (Epidotized Granite)
metamorphic
Rounded granite cobble
Granite; chiefly quartz, alkali feldspar, plagioclase, and biotite/hornblende
igneous
Weathered basalt
Basalt; fine-grained mafic volcanic rock, chiefly plagioclase and pyroxene with possible olivine
igneous
Weathered river stones, likely basaltic andesite and related volcanic rocks
Fine-grained mafic/intermediate volcanic rocks; commonly basalt (plagioclase + pyroxene ± olivine) or andesite (plagioclase + pyroxene ± amphibole)
igneous
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Quartzite
Hydrothermal Quartz or Quartzite (SiO2)
metamorphic
Demitasse Granite (Diorite-Granite transition)
Intermediate Plutonic Rock (Granodiorite/Diorite mix)
igneous
Greenstone
Metabasalt (composed mainly of chlorite, epidote, and actinolite)
metamorphic
Gneiss
Gneiss
metamorphic
Gneiss (specifically a Granitic Gneiss)
Gneiss (typically composed of Quartz, Feldspar, and Mica/Amphiboles)
metamorphic
Gneiss
Gneiss
metamorphic
Nickel
Nickel (Ni)
mineral
Polished basalt pebble
Basalt, a fine-grained mafic volcanic rock; likely containing plagioclase, pyroxene, olivine, and iron oxides
igneous
Granite (Thin Section)
Granite (Felsic Plutonic Rock)
igneous
Malachite or Chrysocolla on Host Rock
Cu2(CO3)(OH)2 (Malachite) or (Cu,Al)2H2Si2O5(OH)4 (Chrysocolla)
mineral
Pegmatitic granite, possibly potassium-feldspar-rich
Coarse-grained granite; mainly quartz (SiO₂), potassium feldspar (KAlSi₃O₈), plagioclase, and biotite/hornblende
igneous
Sulfur
Sulfur (S8)
mineral
Limonite/Goethite on Shale
Hydrous ferric oxides (FeO(OH)·nH2O) often associated with argillaceous rock
sedimentary
Iron-stained Quartz (Gossan/Limonite-coated Quartz)
Silicon Dioxide (SiO2) with Hydrated Iron Oxides (FeO(OH)·nH2O)
mineral
Liesegang Banded Sandstone (Wonderstone)
Ferruginous Sandstone with Liesegang Rings
sedimentary
Pegmatitic mica-rich granite
Granitic pegmatite, composed mainly of quartz, feldspar, and biotite/muscovite mica
igneous
Gneiss
Gneiss
metamorphic
Gneiss
Gneiss
metamorphic
Gneiss (specifically Granitic Gneiss)
Gneiss (composed primarily of Quartz, Feldspar, and Biotite/Amphibole)
metamorphic
Weathered copper-bearing rock, possibly malachite/chrysocolla-bearing matrix
Indeterminate; likely copper carbonate/silicate minerals in a host rock, potentially malachite (Cu₂CO₃(OH)₂) or chrysocolla (hydrated copper silicate)
mineral
Howlite
Calcium borosilicate hydroxide (Ca2B5SiO9(OH)5)
mineral
Rose Quartz Chips
Quartz (Silicon Dioxide - SiO2)
mineral
Moqui Marble (Concretion)
Iron Oxide Concretion (Hematite/Goethite)
sedimentary
Azurite and Malachite
Azurite (Cu3(CO3)2(OH)2) and Malachite (Cu2(CO3)(OH)2)
mineral
Amygdaloidal Basalt with Secondary Minerals
Basalt containing secondary mineralization (likely Chlorite, Celadonite, or Zeolites)
igneous
Pegmatite
Igneous Pegmatite
igneous
Greenstone / Greenschist
Greenschist facies metamorphic rock (composed primarily of chlorite, actinolite, and epidote)
metamorphic
Vesicular basalt
Basalt, a mafic volcanic rock composed mainly of plagioclase feldspar, pyroxene, and often olivine
igneous
Granite Cobble
Granite
igneous
Granodiorite
Granodiorite (Intermediate intrusive igneous rock)
igneous
Gneiss
Gneiss
metamorphic
Fossilized Shark Tooth
Chondrichthyes (Class)
fossil
Biotite Schist
Schist (Biotite-dominated)
metamorphic
Gneiss
Banded Gneiss
metamorphic
Gneiss
Metamorphic Gneiss
metamorphic