Basalt (with possible quartz veinsing)
Basalt
igneous
Category
Mineral Specimen
Browse mineral specimen specimens identified by the Rock Identifier community.
Sandstone
Arenite (composed primarily of SiO2)
sedimentary
Massive Milky Quartz (with Iron Inclusions)
Quartz (Silicon Dioxide, SiO2)
mineral
Ferruginous Quartz
Silicon Dioxide with Iron Oxide (SiO2 + Fe2O3)
mineral
Granite
Phaneritic Igneous Rock (composed mostly of Quartz, Alkali Feldspar, and Plagioclase)
igneous
Sandstone (with biological crust)
Arenite (SiO2 based)
sedimentary
White Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Quartz (Milky/Yellowish Pebble)
Silicon Dioxide (SiO2)
mineral
Diamond (set in Gold)
Diamond (pure carbon, C)
mineral
Carnelian Agate
Silicon Dioxide (SiO2) with Iron Impurities
mineral
Satin Spar (Selenite)
Gypsum (Calcium Sulfate Dihydrate) - CaSO4·2H2O
mineral
Basalt with Quartz/Epidote Vein
Mafic volcanic rock (formula primarily (Mg, Fe)2SiO4 and CaAl2Si2O8)
igneous
Sandstone (Ferruginous)
Arenite (with Goethite/Limonite cement)
sedimentary
Gneiss
Gneiss (High-grade Regional Metamorphic Rock)
metamorphic
Granodiorite (Gneissic Pebble)
Granodiorite displaying minor foliation
igneous/metamorphic
Jasper
Jasper (Silicon Dioxide, SiO2)
sedimentary
Milky Quartz (Water-Worn Cobble)
Silicon Dioxide (SiO2)
mineral
Banded Jasper
Silicon Dioxide (SiO2) with iron oxide inclusions
sedimentary
Petoskey Stone
Hexagonaria percarinata (Fossilized Rugose Coral)
sedimentary
Sandstone Pebble with Iron Staining
Clastic Sedimentary Rock (primarily Quartz with Fe2O3 oxides)
sedimentary
Granite
Phaneritic Plutonic Felsic Rock (KAlSi3O8 - SiO2 - NaAlSi3O8)
igneous
Quartz (Iron-stained)
Silicon Dioxide (SiO2)
mineral
Sandstone (Micaceous/Feldspathic variant)
Arenite (specifically subarkose or lithic arenite)
sedimentary
Quartz (River Pebble)
Silicon Dioxide (SiO2)
mineral
Massive Quartz (Yellow/Citrine variety)
Silicon Dioxide (SiO2)
mineral
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Honey Calcite
Calcium Carbonate (CaCO3)
mineral
Green Quartz (Prasiolite variant or Aventurine)
Silicon Dioxide (SiO2)
mineral
Gold Ore
Gold-bearing Quartz (Native Gold, Au)
mineral
Quartz (Druzy on Matrix)
Silicon Dioxide (SiO2)
mineral
Sandstone (Ferruginous)
Clastic Sedimentary Rock (SiO2 with FeO/Fe2O3)
sedimentary
Watermelon Tourmaline in Quartz Matrix
Elbaite (complex Borosilicate) - Na(Li,Al)3Al6(BO3)3Si6O18(OH)4
mineral
Fuchsite Schist
Chromium-rich Muscovite (K(Al,Cr)2(AlSi3O10)(OH)2) in Schist
metamorphic
Libyan Desert Glass
Impact-melt silica glass (SiO2 + traces of Al, Fe, Ti)
mineral (Tektite/Impactite)
Pyrite (Fool's Gold)
Iron Sulfide (FeS2)
mineral
Quartz (River Pebble)
Silicon Dioxide (SiO2)
mineral
Agate (Moss or Plume Agate variety)
Silicon Dioxide (SiO2)
mineral
Sandstone (Weathered Coastal Boulder)
Arenite (composed primarily of SiO2)
sedimentary
Yellow Quartz (Citrine Quartz variety / Ferruginous Quartz)
Silicon Dioxide (SiO2) with iron inclusions
mineral
Granite (Granitic Pegmatite/Porphyry)
Felsic intrusive igneous rock (Quartz, Feldspar, Mica composition)
igneous
Quartz Druzy on Geode Fragment
Silicon Dioxide (SiO2)
mineral
Lepidolite with Quartz
K(Li,Al)3(Al,Si,Rb)4O10(F,OH)2
mineral