Sandstone
Clastic Sedimentary Rock
sedimentary
Category
Mineral_rock
Browse mineral_rock specimens identified by the Rock Identifier community.
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Green Tourmaline (Verdelite) / Actinolite
Tourmaline group: Na(Mg,Fe,Li,Al,Mn)3Al6(BO3)3Si6O18(OH)4 / Actinolite: Ca2(Mg,Fe)5Si8O22(OH)2
mineral
Lepidolite
Lepidolite (K(Li,Al)3(Al,Si,Rb)4O10(F,OH)2)
mineral
Malachite
Malachite, Cu2CO3(OH)2
mineral
Calcite
Calcium Carbonate (CaCO3)
mineral
Ironstone Nodule
Ironstone (Ferruginous Rock)
sedimentary
Conglomerate
Conglomerate (Sedimentary Rock)
sedimentary
Weathered granitic rock, likely granodiorite
Granodiorite: quartz, plagioclase feldspar, potassium feldspar, and biotite/hornblende
igneous
Basalt Porphyry
Porphyritic Basalt
igneous
Copper Ore (Malachite and Limonite bearing)
Cuprite, Malachite, and Limonite mixture
mineral
Jasper Mushroom Carving
Silicon Dioxide (Microcrystalline Quartz, SiO2)
mineral
Pyrite in Matrix
Iron Disulfide (FeS2)
mineral
Iron-stained milky quartz
Quartz (SiO₂), mainly massive or vein quartz, with reddish-brown iron-oxide staining and possible minor feldspar or other vein minerals
mineral
Banded metamorphic rock, likely gneiss
Biotite–quartz–feldspar gneiss, possibly amphibolite-bearing
metamorphic
Weathered iron-rich rock, possibly laterite or altered basalt
Probable ferruginous basalt/lat eritic material; exact identification requires testing
igneous
Clear Quartz (Rock Crystal)
Silicon Dioxide (SiO2)
mineral
Milky quartz-rich rock
Quartz (SiO₂), likely massive milky quartz with minor iron-oxide staining and attached host material
mineral
Likely smoky quartz-bearing rock or quartz crystal
Quartz, silicon dioxide (SiO₂), possibly smoky quartz with iron- or irradiation-related coloration
mineral
Likely weathered brown rock or iron-rich mineral specimen
Indeterminate from image; possible limonite/goethite-rich material
mineral
Iron-rich slag or limonite-bearing rock
Hydrated iron oxides, chiefly limonite/goethite (FeO(OH)·nH₂O); possibly industrial iron slag
mineral
Iron-stained garnet-bearing rock, possibly almandine garnet
Garnet-group silicate, likely almandine (Fe₃Al₂Si₃O₁₂), in a quartz–iron-oxide matrix
mineral
Quartz (Milky or Cloudy)
Silicon Dioxide (SiO2)
mineral
Iron-stained quartz-bearing rock
Quartz (SiO₂), likely in a limonite/goethite-rich matrix
mineral
Sandstone (with Rock Art)
Sandstone (Clastic Sedimentary Rock)
sedimentary
Weathered granitic rock (tentative)
Granite, composed mainly of quartz, feldspar, and mica
igneous
Granite / Igneous Rock Specimen
Phaneritic Igneous Rock
igneous
Unakite
Epidotized Granite
metamorphic
Quartz with Spessartine Garnet and Iron Staining
Silicon Dioxide (SiO2) with Almandine-Spessartine (Mn3Al2(SiO4)3)
mineral
Quartz
Silicon Dioxide (SiO2)
mineral
Chalcedony
Silicon Dioxide (SiO2)
mineral
Prehnite
Prehnite (Ca2Al(AlSi3O10)(OH)2)
mineral
Iron-stained Quartz
Silicon Dioxide (SiO2) with Hematite/Limonite inclusions
mineral
Quartz Pebble
Silicon Dioxide (SiO2)
sedimentary
Quartz
Silicon Dioxide (SiO2)
mineral
Pebble / Rounded Rock
Lithic fragment / Water-worn rock
sedimentary
Iron-stained quartz-rich rock, likely quartzite or silicified breccia
Quartz (SiO₂), possibly quartzite with limonite/goethite iron oxides
metamorphic
Aquamarine (Beryl)
Beryllium Aluminum Silicate - Be3Al2Si6O18
gemstone
Quartz (Druzy/Crystalline)
Silicon Dioxide (SiO2)
mineral
Stichtite in Serpentine (Atlantasite)
Mg6Cr2CO3(OH)16·4H2O in Mg3Si2O5(OH)4
metamorphic
Sandstone
Arenite (primarily SiO2)
sedimentary
Quartz Pebble
Silicon Dioxide (SiO2)
sedimentary
Quartz Pebble
Quartz (SiO2)
sedimentary