Granite
Intrusive igneous rock
igneous
Category
Mineral Composite
Browse mineral composite specimens identified by the Rock Identifier community.
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Fossil / Permineralized Bone
Tyrannosaurus rex fossil (Hydroxylapatite replaced by various minerals)
sedimentary
Turquoise
Turquoise, CuAl6(PO4)4(OH)8·4H2O
mineral
Banded Sandstone (River Cobble)
Arenite Sandstone with heavy mineral layering
sedimentary
Botryoidal Hematite
Iron(III) oxide (Fe2O3)
mineral
Vanadinite
Lead Chlorovanadate, Pb5(VO4)3Cl
mineral
Mica-rich metamorphic rock, likely schist
Muscovite–biotite schist, possibly with quartz and feldspar
metamorphic
Lapis Lazuli (Low Grade)
Lazurite-rich metamorphic rock ((Na,Ca)8(AlSiO4)6(SO4,S,Cl,OH)2)
metamorphic
Unakite
Unakite (Metasomatized Granite)
metamorphic
Orthoclase Feldspar
Orthoclase (KAlSi3O8)
mineral
Devil's Toenail (Fossil Oyster)
Gryphaea arcuata (Calcium Carbonate, CaCO3)
sedimentary
Chalcedony (Botryoidal)
Silicon Dioxide (SiO2)
mineral
Sandstone with Manganese Oxide Patina
Clastic Sedimentary Rock (primarily SiO2)
sedimentary
Milky Quartz with Mica Matrix
SiO2 (Silicon Dioxide) with Muscovite/Biotite mica
mineral
Prehnite
Prehnite (Ca2Al2Si3O10(OH)2)
mineral
Morganite and Aquamarine (Beryl) Bracelet
Beryllium aluminum silicate, Be3Al2(SiO3)6
gemstone
Bicolor Quartz Tumble
Silicon Dioxide (SiO2)
mineral
Limonite (Iron Ore)
Hydrated ferric oxide mixture (FeO(OH)·nH2O)
sedimentary
Blue Apatite
Apatite - Ca5(PO4)3(F,Cl,OH) (Calcium phosphate with Fluorine, Chlorine, or Hydroxyl)
mineral
Granite
Intrusive Felsic Igneous Rock
igneous
Granite
Intrusive Igneous Rock
igneous
Gneiss
Gneiss (a rock type, not a specific mineral with a formula)
Metamorphic Rock
Polished serpentine pebble
Serpentinite, chiefly serpentine-group minerals (chrysotile, lizardite, antigorite)
metamorphic
Gneiss
Metamorphic Gneiss (High-grade regional metamorphism)
metamorphic
Likely quartz-rich mineral fragment
Quartz (SiO₂), possibly iron-stained or included quartz
mineral
Granite
Granite (felsic intrusive igneous rock)
igneous
Shark Tooth Fossil
Carcharodon / Otodus fossilized tooth (Calcium Phosphate / Hydroxyapatite)
fossil
Fossilized Shark Tooth
Chondrichthyes (Class)
fossil
Green Fluorite
Fluorite (Calcium Fluoride, CaF2)
mineral
K-Feldspar (Potassium Feldspar / Pink Feldspar)
KAlSi3O8 (Potassium Aluminum Silicate)
mineral
Travertine
Calcium Carbonate (CaCO3)
sedimentary
Limonite (Yellow Ochre)
Hydrated iron(III) oxide-hydroxides (FeO(OH)·nH2O)
mineral
Limonite (Iron Ore)
Hydrated Iron(III) Oxide-Hydroxide (FeO(OH)·nH2O)
mineral
Garden Quartz (Lodalite)
Silicon Dioxide with various mineral inclusions (SiO2)
mineral
Quartz in Greenstone
Metamorphic rock with quartz vein (SiO2 / mixed silicates)
metamorphic
Quartz with Sulfide Inclusions
Silicon Dioxide (SiO2) with metallic mineral inclusions
mineral
Bornite (Peacock Ore)
Bornite (Cu5FeS4)
mineral
Mammoth or Mastodon Tooth Fragment
Mammuthus / Mammut molar fragment
fossil
Bumblebee Jasper (technically Bumblebee Stone)
Calcite, Aragonite, and Realgar/Orpiment mixture (SiO2 + CaCO3 + As2S3/As2S2)
sedimentary (volcanic)
Rock Specimen
Unclassified rock specimen
sedimentary
Lapis Lazuli
(Na,Ca)8(AlSiO4)6(S,SO4,Cl)1-2 (Complex silicate rock)
metamorphic
Copper Ore (Malachite, Azurite, and Chalcopyrite in Host Rock)
Copper-bearing polymetallic mineral aggregate (Cu-minerals)
mineral