Sandstone
Arenite
sedimentary
Category
Mineral_rock
Browse mineral_rock specimens identified by the Rock Identifier community.
Learn about Mineral_rock in the encyclopedia
View all →
Sandstone
Arenite (primarily SiO2)
sedimentary
Turquoise
CuAl6(PO4)4(OH)8·4H2O (Hydrous phosphate of copper and aluminium)
mineral
Quartz Geode
Quartz (Silicon Dioxide, SiO2) in a Geode
sedimentary
Conglomerate
Conglomerate (a clastic sedimentary rock)
Sedimentary Rock
Granite
Intrusive Igneous Rock
igneous
Sandstone
Sedimentary Clastic Rock
sedimentary
Sandstone
Clastic Sedimentary Rock
sedimentary
Banded metamorphic rock, likely mica schist or gneiss
Quartz–feldspar–mica schist/gneiss; exact identification requires a fresh surface and mineral tests
metamorphic
Jasper
Silicon dioxide (Quartz variety), SiO2
sedimentary
Prehnite
Ca2Al(AlSi3O10)(OH)2
mineral
Quartz Crystal Cluster
Silicon Dioxide (SiO2)
mineral
Peridot
Olivine ((Mg,Fe)2SiO4)
gemstone
Jasper
Silicon Dioxide (SiO2) - Microcrystalline Quartz
sedimentary
Sunstone
Oligoclase (Plagioclase Feldspar), (Na,Ca)(Si,Al)4O8
mineral
Apatite
Calcium phosphate fluoride/chloride, Ca5(PO4)3(F,Cl,OH)
mineral
Fuchsite in Quartz
Muscovite (KAl2(AlSi3O10)(OH)2) containing Chromium + Quartz (SiO2)
metamorphic
Jasper and Mudstone Composite
Silicified Sedimentary Rock / Jasperoid Pebble
sedimentary
Fossilized Dinosaur Skull (Tyrannosaurus rex)
Tyrannosaurus rex (permineralized fossil), rich in Hydroxylapatite/Silica
sedimentary
Petrified Wood
Silicified Wood (SiO2)
fossil
Quartz Crystal Cluster / Quartzite
Silicon Dioxide (SiO2)
mineral
Granite
Intrusive Igneous Rock
igneous
Granite
Intrusive Igneous Rock
igneous
Cobblestones (Basalt/River Rock)
Polished lithic fragments and rounded pebbles
sedimentary
Quartz
Silicon Dioxide (SiO2)
mineral
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
K-Feldspar (Potassium Feldspar / Pink Feldspar)
KAlSi3O8 (Potassium Aluminum Silicate)
mineral
Actinolite (likely fibrous amphibole)
Actinolite, Ca₂(Mg,Fe)₅Si₈O₂₂(OH)₂; possibly an actinolite–tremolite specimen
mineral
Granite
Granite (Phaneritic igneous rock)
igneous
Quartz (Milky/Snow)
Silicon Dioxide (SiO2)
mineral
Satin Spar (Gypsum)
Calcium Sulfate Dihydrate (CaSO4·2H2O)
mineral
Granite (possibly granitic gneiss)
Felsic plutonic rock dominated by quartz, K-feldspar, plagioclase, biotite and/or hornblende
igneous
Tiger's Eye
Silicon Dioxide (Quartz with crocidolite inclusions), SiO2
gemstone
Bull Quartz with Mica and Host Rock
Massive Quartz (SiO2) with Muscovite/Chlorite inclusions
igneous
Grey River Stone (Gneiss/Schist mix)
Foliated Metamorphic Rock (variable mineral formula)
metamorphic
Siltstone
Siltstone (primarily composed of quartz and clay minerals)
sedimentary
Dragon Blood Jasper
Epidote with Pietersite or Red Jasper (Silicate mineral)
metamorphic
Pyrite-rich Ore
Pyrite (FeS2) with secondary minerals
mineral
Howlite
Hydrous calcium borosilicate (Ca2B5SiO9(OH)5)
mineral
Dyed Selenite
Gypsum (Calcium Sulfate Dihydrate, CaSO4·2H2O)
mineral
Sea Snail Shell (Top Shell)
Trochidae family (Calcium Carbonate, CaCO3)
mineral
Goethite / Limonite Gossan
Hydrated Iron Oxide (FeO(OH))
sedimentary