Quartz Pebble
Silicon Dioxide (SiO2)
sedimentary
Category
Mineral (Processed Alloy)
Browse mineral (processed alloy) specimens identified by the Rock Identifier community.
Quartz Pebble
Silicon Dioxide (SiO2)
sedimentary
Mica Schist / Granite
Mica Schist (Silicate metamorphic rock)
metamorphic
Rock Specimen
Unclassified rock specimen
sedimentary
Angular gray rock fragments
Unidentified fine-grained rock; the image does not show diagnostic features sufficient for a specific identification
igneous
N/A - Image is non-geological
Acrylonitrile Butadiene Styrene (ABS) or Polypropylene (PP)
Synthetic material (Plastic/Polymer)
Small brown mineral or rock fragment
Undetermined; the image does not show enough detail for reliable identification
mineral
Quartz Pebble
Silicon Dioxide (SiO2)
sedimentary
Pallasite Meteorite
Pallasite (Stony-iron meteorite; Fe-Ni alloy with (Mg,Fe)2SiO4 olivine)
Mineral/Extraterrestrial Rock
Quartz pebble
Silicon dioxide (SiO2)
mineral
Quartz Pebble
Silicon Dioxide (SiO2)
sedimentary
Quartz Pebble
Silicon Dioxide (SiO2)
sedimentary
Arsenopyrite in Quartz Matrix
Arsenopyrite (FeAsS) with Quartz (SiO2)
Mineral in a Metamorphic/Hydrothermal rock
Blue Apatite
Apatite (Calcium Phosphate) - Ca5(PO4)3(F,Cl,OH)
mineral
Sandstone
Arenite (primarily SiO2)
sedimentary
Nephrite Jade
Nephrite
Mineral/Rock
Green Calcite
Calcite (Calcium Carbonate, CaCO3)
mineral
Small tan stone (undetermined)
Unidentified fine-grained geological material; species cannot be determined from the image
mineral
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Arsenopyrite with Schist Matrix
Arsenopyrite (FeAsS)
mineral
Chalcopyrite
Chalcopyrite (CuFeS2)
Mineral
Calcite–fluorite mineral specimen with iron-oxide staining
Calcite (CaCO₃), likely fluorite (CaF₂), with possible quartz and iron/manganese oxides
mineral
Turquoise cabochon
Turquoise; hydrated copper–aluminum phosphate, approximately CuAl6(PO4)4(OH)8·4H2O (composition varies)
gemstone
Emerald
Beryl (Be₃Al₂Si₆O₁₈), specifically the green variety colored by trace amounts of chromium or vanadium.
Mineral
Yellow Calcite
Calcium Carbonate (CaCO3)
mineral
Biotite (Mica)
Biotite (K(Mg,Fe)3AlSi3O10(OH,F)2)
mineral
Mixed Mineral Collection (Quartz, Amethyst, Rose Quartz, Pyrite, etc.)
Mixed Silicates and Sulfides (SiO2, FeS2)
mineral
Carved Stone Turtle
Carved Soapstone and Quartz
mineral
Tiger's Eye
Pseudomorph of Quartz after Crocidolite (SiO2 with iron oxide inclusions)
metamorphic
Shark Tooth Fossil
Carcharocles megalodon or similar extinct shark tooth
fossil
Limonite Concretion
FeO(OH)·nH2O (Hydrated Iron Oxide)
sedimentary
Jasper and Chalcedony Composite
Silicon Dioxide (SiO2) microcrystalline quartz
sedimentary
Granite fragment
Granite (Felsic Plutonic Rock)
igneous
Quartz Pebble
Quartz (Silicon Dioxide - SiO2)
mineral
Granite
Intrusive Igneous Rock (Felsic)
igneous
Orange Calcite
Calcium Carbonate (CaCO3)
mineral
Fossilized Bone
Permineralized Vertebrate Fossil
sedimentary
Unidentified metallic mineral or meteorite fragment
Indeterminate; possible native metal-bearing sulfide or iron meteorite fragment
mineral
Snowflake Obsidian
Volcanic Glass with Cristobalite Inclusions
igneous
Spinifex Texture Komatiite
Komatiite (Ultramafic Volcanic Rock)
igneous
Moqui Marble
Hematite-Goethite Concretion (Fe2O3 / FeO(OH))
mineral
Polished iron meteorite fragment
Iron meteorite, chiefly kamacite and taenite (Fe–Ni alloys), possibly weathered or etched
meteorite