Glaucophane-bearing Schist (Blueschist)
Blueschist (Glaucophane-Lawsonite Schist)
metamorphic
Category
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Browse this image does not display a rock, mineral, or geological specimen. it shows a human hand wearing a ring. specimens identified by the Rock Identifier community.
Chert (or Flint)
Chert (Sedimentary Cryptocrystalline Sio2)
sedimentary
Limonite-stained Granite
Felsic Plutonic Rock with Hydrated Iron Oxides
igneous
Chert (Brown variety / Common Jasper)
Microcrystalline Quartz (SiO2)
sedimentary
Red Sandstone (Iron-rich)
Ferruginous Sandstone (variable formula, primarily SiO2 + Fe2O3)
sedimentary
Diorite
Plutonic Igneous Rock (Intermediate Composition)
Igneous
Gold Ore
Auriferous Quartz and Sulfide Mineralization in Host Rock
igneous
Concretion with Quartz Veining
Septarian Concretion (CaCO3 / SiO2)
sedimentary
Quartz (likely milky quartz or a stained variety)
Silicon Dioxide (SiO₂)
Mineral
Garnet (Almandine or Spessartine likely)
Garnet Group Minerals (e.g., Almandine Fe3Al2(SiO4)3, Pyrope Mg3Al2(SiO4)3, Spessartine Mn3Al2(SiO4)3)
Mineral
Fluorite in Matrix
Fluorite (CaF2) within a host rock matrix
Mineral
Sandstone Cobble with Liesegang Rings
Arenite with iron oxide precipitation (SiO2 matrix with Fe2O3 banding)
sedimentary
Quartz Geode (Druzy)
Crystalline Silicon Dioxide (SiO2)
mineral
Sandstone
Arenite (SiO2 based with various mineral cements)
sedimentary
Garnet in Matrix (likely Almandine in Quartz/Mica Schist)
Almandine Garnet (Fe3Al2(SiO4)3) in Quartz-Feldspar host rock
metamorphic
Peacock Ore
Bornite (Cu5FeS4)
mineral
Gneiss (specifically Granite Gneiss)
Gneiss (High-grade Regional Metamorphic Rock)
metamorphic
Halite (Rock Salt)
Halite (Sodium Chloride, NaCl)
mineral
Basalt (Vesicular)
Basalt (Mafic Extrusive Igneous Rock)
igneous
Lapis Lazuli (polished cabochon)
Lazurite-rich metamorphic rock (approx. Na6Ca2Al6Si6O24(SO4,S,Cl)2)
metamorphic
Sandstone (Ferruginous)
Clastic sedimentary rock (primarily SiO2 with Fe2O3 cement)
sedimentary
Quartz (River Pebble)
Quartz (SiO₂ - Silicon Dioxide)
Mineral
Chert (Flint)
Chert (predominantly SiO₂ - silicon dioxide)
sedimentary
Opalite (Man-made Glass)
Synthetic Silicon Dioxide Glass (SiO2 + metal oxides)
Synthetic Mineral Simulant / Glass
Pink Granite
Felsic intrusive igneous rock (composition: SiO2 and Al2O3)
igneous
Mica Schist
Mica Schist (predominantly Muscovite or Biotite sheet silicates)
metamorphic
Garnet-Mica Schist
Garnetiferous Porphyroblastic Schist
metamorphic
Granite
Granite (phaneritic intrusive igneous rock consisting of quartz, feldspar, and mica)
igneous
Quartz
Silicon Dioxide (SiO₂)
Mineral
Shale
Shale (composition varies: primarily clay minerals and quartz)
sedimentary
Muscovite Mica
Muscovite - KAl2(AlSi3O10)(F,OH)2
mineral
Banded Chert or Chert with Quartz Veins
Chert (SiO2)
Sedimentary
Granite / Gneiss Complex
Felsic Plutonic Rock (Granite) or High-grade Metamorphic Rock (Gneiss)
igneous/metamorphic
Gneiss (specifically a Granitic Gneiss)
Gneiss (Composition: Quartz, Feldspar, Mica)
metamorphic
Granite
Phaneritic Felsic Igneous Rock
igneous
Amygdaloidal Basalt
Amygdaloidal Basalt with Secondary Infilling (e.g., Agate, Quartz, or Zeolite)
igneous
Michigan Float Copper
Native Copper (Cu)
mineral
Tektite (likely Australite)
Tektite (no specific chemical formula as it's a natural glass of variable composition, mostly SiO2, Al2O3, FeO, MgO, CaO, K2O, Na2O, TiO2)
Mineral (specifically a mineraloid)
Quartz (Milky Quartz)
Silicon Dioxide (SiO₂)
mineral
Sandstone
Arenite (composed primarily of SiO2, or Silicon Dioxide)
sedimentary
Basalt
Basalt (Mafic Extrusive Igneous Rock)
igneous
Chrome Diopside
Magnesium Calcium Silicate (MgCaSi2O6) containing Chromium impurities
mineral