Polished jasper carving or slab
Jasper, an opaque microcrystalline variety of quartz (SiO₂), likely iron-oxide-rich brecciated or orbicular jasper
gemstone
Category
Mineral_rock
Browse mineral_rock specimens identified by the Rock Identifier community.
Learn about Mineral_rock in the encyclopedia
View all →
Bauxite
Bauxite (Al(OH)3, AlO(OH))
sedimentary
Bauxite
Bauxite (Al2O3·nH2O)
sedimentary
Limonite (Iron Ore)
FeO(OH)·nH2O (Hydrous ferric oxide)
mineral
Limonite-stained Quartz
Silicon Dioxide (SiO2) with Iron Oxide/Hydroxide (FeO(OH)·nH2O) staining
mineral
Lapis Lazuli
Lapis Lazuli (A metamorphic rock primarily composed of Lazurite: (Na,Ca)8(AlSiO4)6(S,Cl,SO4,OH)2)
metamorphic
Green Fluorite
Calcium Fluoride (CaF2)
mineral
Green Fluorite
Fluorite (Calcium Fluoride, CaF2)
mineral
Purpurite
Manganese Iron Phosphate, Mn3+(PO4)
mineral
Picture Jasper
Silicon Dioxide (SiO2) with iron oxide and silicate minerals
sedimentary
Hematite
Hematite (Fe2O3)
mineral
Chert with Calcite Veins
Silicon Dioxide (SiO2) with Calcium Carbonate (CaCO3) intrusions
sedimentary
Sandstone (Ferruginous)
Arenite (Fe-oxide enriched)
sedimentary
Sandstone
Arenite (SiO2 primarily)
sedimentary
Serpentine-rich rock (likely serpentinite)
Serpentinite; chiefly antigorite, lizardite, or chrysotile Mg₃Si₂O₅(OH)₄
metamorphic
Weathered iron-rich rock (likely ironstone or altered basalt)
Probable limonite/goethite-bearing basalt or ironstone; exact identification requires testing
igneous
Dark coarse-grained metamorphic rock, likely amphibolite or hornblende schist
Amphibolite, dominated by hornblende amphibole and plagioclase feldspar; exact identification requires testing
metamorphic
Possible fossilized bone fragment
Indeterminate fossil bone; no species can be identified from this image
fossil
Lepidolite
K(Li,Al)3(Al,Si,Rb)4O10(F,OH)2
mineral
Yellow Calcite
Calcium Carbonate (CaCO3)
mineral
Sandstone with Manganese Dendrites
Arenite (mostly SiO2) with Manganese Oxide inclusions (MnO2)
sedimentary
Sandstone
Arenite
sedimentary
Sandstone (Ferruginous)
Arenite with Hematite cement (SiO2 + Fe2O3)
sedimentary
Limonite Concretion (Goonie or Rattlestone)
Limonite (FeO(OH)·nH2O)
sedimentary
Azurite
Azurite (Cu3(CO3)2(OH)2)
mineral
Kidney Stone
Calcium Oxalate (CaC2O4·nH2O)
mineral
Blue Howlite (Dyed)
Dyed Howlite (Calcium Borosilicate Hydroxide, Ca2B5SiO9(OH)5)
mineral
Granite with Epidote
Phaneritic intrusive igneous rock with Epidote (Ca2(Al2,Fe)(SiO4)(Si2O7)O(OH))
igneous
Granite
Intrusive igneous rock
igneous
Magnetite
Magnetite (Fe3O4)
mineral
Ironstone Concretion (Moqui Marble / Boji Stone)
Sedimentary Iron Oxide Concretion (Fe2O3 / FeO(OH))
sedimentary
Red Sandstone (with possible iron oxide staining)
Sandstone (primarily Quartz with Hematite/Goethite cement)
sedimentary
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Banded gneiss (likely amphibolite-bearing gneiss)
Gneiss; quartz–feldspar–mica/amphibole aggregate
metamorphic
Limonite (Iron Ore)
FeO(OH)·nH2O
mineral
Limonite Concretion (Ironstone)
Limonite (Hydrated Iron(III) Oxide-Hydroxide, FeO(OH)·nH2O)
sedimentary
Milky quartz
Quartz (silicon dioxide, SiO₂)
mineral
Green Aventurine and Clear Quartz Bracelet
Quartz variety with Fuchsite inclusions (Aventurine) and pure Silicon Dioxide (SiO2)
gemstone
Rounded quartz-rich cobble, likely granite-derived stone
Granite or granitic gneiss, composed mainly of quartz, feldspar, and minor mica
igneous
Milky quartz (quartz crystal)
Quartz, silicon dioxide (SiO₂)
mineral
Milky quartz
Quartz (silicon dioxide, SiO₂)
mineral
Tumbled milky quartz pebble
Quartz (silicon dioxide, SiO₂)
mineral