Emerald
Beryl (Be3Al2Si6O18 with Chromium/Vanadium impurities)
mineral
Category
Mineral Composite
Browse mineral composite specimens identified by the Rock Identifier community.
Learn about Mineral Composite in the encyclopedia
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Dyed Quartz Geode
Silicon Dioxide (SiO2) with artificial pigment
mineral
Milky Quartz
Quartz (Silicon Dioxide, SiO2)
mineral
Banded Agate
Silicon dioxide (SiO2) - variety of Chalcedony
sedimentary
Snowflake Obsidian
Obsidian with Cristobalite inclusions (SiO2)
igneous
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Botryoidal Hematite (Iron Ore)
Iron(III) oxide (Fe2O3)
mineral
Kidney Stone (Urolith)
Calculus renalis (Biogenic mineral aggregate)
mineral
Gossanous Sandstone (likely Terrestrial)
Arenite with Iron-Oxide inclusions
sedimentary
Quartz Geode (with possible Manganese or Goethite coating)
Silicon Dioxide (SiO2)
mineral
Amygdaloidal Basalt
Basalt with secondary mineral infilling (SiO2/CO3)
igneous
Limestone or Sandstone Cobble
Sedimentary rock (Calcium carbonate or Quartz based)
sedimentary
Bauxite
Bauxite (Al(OH)3, AlO(OH))
sedimentary
Quartz-veined Basalt or Limestone Pebble
Quartz vein in host rock (Silicate mineral in carbonate or volcanic matrix)
sedimentary
Prehnite
Prehnite (Ca2Al(AlSi3O10)(OH)2)
mineral
Sandstone
Sedimentary Clastic Rock (Quartz Arenite)
sedimentary
Granitic gneiss (weathered, rounded cobble)
Foliated granitoid; primarily quartz, feldspar, and mica (composition commonly approximates granite)
metamorphic
Tiny metallic mineral fragment, possibly native gold
Native gold (Au), unconfirmed; could also be pyrite or chalcopyrite
mineral
Biotite Schist
Schist (Biotite-dominated)
metamorphic
Painted Rock / Geode Specimen
Silicon Dioxide with artificial pigment coating
mineral
Granite
Granite (Felsic Plutonic Rock)
igneous
Sandstone (with possibly iron oxides and other minerals)
Sandstone
Sedimentary rock
Limonite (Yellow Ochre)
Hydrated iron(III) oxide-hydroxide (FeO(OH)·nH2O)
mineral
Garnet
Almandine/Pyrope Garnet (X3Y2(SiO4)3)
mineral
Fossil-bearing Sedimentary Rock
Sedimentum cum fossili
fossil
Geode (Quartz / Chalcedony Geode)
SiO2 (Silicon Dioxide)
sedimentary
Spiny Oyster Shell
Spondylus (Calcium Carbonate, CaCO3)
mineral
Lapis Lazuli
Na6Ca2(Al6Si6O24)(S,SO4,Cl)1-2 (primarily containing Lazurite with inclusions of Calcite and Pyrite)
metamorphic
Limonite/Hematite Ironstone
Goethite-rich Ironstone (FeO(OH) · nH2O)
sedimentary
Brimstone (Native Sulfur)
Native Sulfur (S)
mineral
Malachite
Malachite - Cu2CO3(OH)2
mineral
Sandstone
Arenite (Clastic Sedimentary Rock)
sedimentary
Chrysocolla in Matrix
Chrysocolla (Cu2-xAlx(H2-xSi2O5)(OH)4·nH2O)
mineral
Turquoise
Hydrated phosphate of copper and aluminium (CuAl6(PO4)4(OH)8·4H2O)
mineral
Fuchsite (Chrome Mica)
K(Al,Cr)2(AlSi3O10)(OH)2
mineral
Limonite (Iron Ore)
Limonite (FeO(OH)·nH2O)
mineral
Quartz with Inclusions
Silicon Dioxide (SiO2)
mineral
Sandstone
Clastic sedimentary rock (primarily SiO2)
sedimentary
Limonite (Ironstone)
FeO(OH)·nH2O
sedimentary
Sandstone
Sandstone (clastic sedimentary rock)
Rock
Fossilized Bone
Permineralized Vertebrate Bone
fossil
Sea Shell Fragment (Calcium Carbonate)
Aragonite / Calcite (CaCO3)
mineral