Sand Grain (Silica/Quartz Grain)
Silicon Dioxide (SiO2)
sedimentary
Category
Mineral In Metamorphic Rock
Browse mineral in metamorphic rock specimens identified by the Rock Identifier community.
Sandstone (Ferruginous)
Clastic Sedimentary Rock (SiO2 with FeO/Fe2O3)
sedimentary
Quartz Vein in Host Rock
Silicon Dioxide (SiO2) within Metasedimentary or Igneous matrix
mineral
Rough Ruby
Corundum (Al2O3) with Chromium traces
mineral
Turquoise
Turquoise (Hydrated phosphate of copper and aluminium) CuAl6(PO4)4(OH)8·4H2O
mineral
Quartzite
Quartzite (Primary mineral: Quartz, SiO2)
metamorphic
K2 Jasper (Beads)
Granodiorite with Azurite and Malachite
igneous
Granite
Granite (a common type of Felsic Intrusive Igneous Rock)
Igneous Rock
Clear Quartz Fragment
Quartz (Silicon Dioxide, SiO2)
mineral
Sandstone
Arenite
sedimentary
Pyrite in Matrix (Fool's Gold)
Iron Sulfide (FeS2)
mineral
Red Sandstone
Arenite (primarily Quartz, SiO2, with Iron Oxide cementing agent)
sedimentary
Sandstone
Arenite (SiO2 based)
sedimentary
Brown Sandstone
Arenite (primarily Quartz and Feldspar, with Iron Oxide cement)
sedimentary
Sandstone
Arenite (primarily SiO2)
sedimentary
Agate Geode Slice (with Druzy Quartz)
Silicon Dioxide (SiO2)
mineral
Green Aventurine
Quartzite with Fuchsite inclusions (SiO2 + K(Al,Cr)2AlSi3O10(OH)2)
metamorphic
Granite (with alteration)
Granite (Felsic intrusive igneous rock)
igneous
Lapis Lazuli
Na6Ca2(Al6Si6O24)(SO4,S,Cl,OH)2 (Lazurite-dominated rock)
metamorphic
Amygdaloidal Basalt
Vesicular Basalt with secondary mineral infilling (commonly Zeolite, Calcite, or Quartz)
igneous
Cobaltoan Calcite / Pink Dolomite (Possible)
Cobaltoan Calcite: (Ca,Co)CO3; Pink Dolomite (or Thulite): CaMg(CO3)2 or Mn-Dolomite / (Thulite: Mn2+3Al2(Si2O7)(SiO4)O(OH))
Mineral / Rock (depending on purity)
Note: Item is not a geological specimen
Guitar Components (Steel, Nickel, Plastic, Wood)
Synthetic/Consumer Product
Quartz Druzy on Geode Fragment
Silicon Dioxide (SiO2)
mineral
Note: This is a Man-Made Object (Costume/Prop Patch)
Synthetic fiber and pigments (Cellulose/Plastic-based composite)
Non-geological
Diorite
Diorite (Intermediate intrusive igneous rock)
igneous
Fuchsite Schist
Chromium-rich Muscovite (K(Al,Cr)2(AlSi3O10)(OH)2) in Schist
metamorphic
Staurolite (Cross Stone)
Staurolite (Fe2+2Al9Si4O23(OH))
metamorphic
Smoky Quartz
Smoky Quartz (Silicon Dioxide, SiO2)
mineral
Sandstone (Pebble/Conglomerate fragment)
Sandstone (clastic sedimentary rock)
Sedimentary Rock
Sapphire (Corundum variety)
Sapphire (Al₂O₃)
Mineral
Banded Agate (with possible Chalcedony layers)
Silicon dioxide (SiO2)
sedimentary
Emerald in Schist (Raw/Tumbled)
Beryllium Aluminum Silicate (Be3Al2Si6O18) with Chromium/Vanadium impurities in Mica Schist
metamorphic
Dark Igneous Rock (Likely Basalt or Diabase)
Basalt (extrusive igneous rock) or Diabase (intrusive igneous rock - also known as Dolerite), largely composed of plagioclase feldspar, pyroxene (augite), and sometimes olivine and amphibole. Exact mineralogy would require thin section analysis.
Igneous
Gneiss
Gneiss
metamorphic
Sandstone (likely Arkosic or Lithic Sandstone)
Arenite (SiO2 based with mineral inclusions)
sedimentary
Magnetite (potentially Hematite-rich)
Magnetite (Fe3O4)
mineral
Carnelian Agate
Silicon Dioxide (SiO2) with iron oxide impurities
mineral
Tiger's Eye
Pseudomorph of Quartz after Crocidolite (SiO2)
metamorphic
Jadeite
NaAlSi2O6 (Sodium Aluminum Silicate)
metamorphic
Rough Gemstone Grains (Mixed Sapphires and Quartz)
Corundum (Al2O3) and Quartz (SiO2)
mineral
Carnelian Agate
Chalcedony (Silicon Dioxide, SiO2)
mineral
Hematite
Iron(III) oxide (Fe2O3)
mineral