Sandstone
Arenite (composed primarily of SiO2)
sedimentary
Category
Man Made Material (Simulated Mineral)
Browse man made material (simulated mineral) specimens identified by the Rock Identifier community.
Learn about Man Made Material (Simulated Mineral) in the encyclopedia
View all →
Sandstone (likely Ferruginous)
Arenite (SiO2 with iron oxide impurities)
sedimentary
Greenish translucent mineral fragment
Indeterminate; possibly serpentine, epidote, or green glassy feldspar
mineral
Schist
Schist (Crystalline metamorphic rock)
metamorphic
Limestone with Calcite Veins
Sedimentary Calcium Carbonate (CaCO3)
sedimentary
Quartz Pebble
Silicon Dioxide (SiO2)
sedimentary
Schist
Schist
metamorphic
White Marble
Metamorphic Limestone (CaCO3)
metamorphic
Quartz (Iron-stained)
Silicon Dioxide (SiO2)
mineral
Quartz (Milky Quartz)
Silicon Dioxide (SiO2)
mineral
Quartz
Silicon dioxide (SiO2)
Mineral
Sandstone (Quartz-rich)
Arenite (primarily SiO2)
sedimentary
Polished ocean jasper / brecciated jasper
Jasper, microcrystalline quartz (SiO₂), with iron-oxide and other silicate inclusions
mineral
Vesicular volcanic rock, likely weathered scoria
Scoria (vesicular basaltic-andesitic volcanic rock), composition approximately plagioclase, pyroxene, and volcanic glass
igneous
Weathered granite or granitic gneiss fragment
Granite, predominantly quartz, feldspar, and dark mica/amphibole
igneous
Porphyry (likely Porphyritic Andesite or Basalt)
Porphyritic Igneous Rock
igneous
Cinnabar in Quartz
Silicon Dioxide (SiO2) with Mercury Sulfide (HgS) inclusions
Mineral
Petrified Wood
Silicified wood (SiO2)
fossil
Yellow Ochre / Limonite
Limonite (Hydrated Iron(III) Oxide-Hydroxide, FeO(OH)·nH2O)
mineral
Fossilized Shell
Invertebrate fossil (Bivalvia or Brachiopoda)
fossil
Sedimentary Sandstone with Iron Oxide
Ferruginous Sandstone
sedimentary
Sandstone
Arenite (SiO2 based with mineral cement)
sedimentary
Fossilized Shark Tooth (Partial) or Coprolite
Elasmobranchii (fossil) or Coprolite (trace fossil)
fossil
Weathered quartz-rich cobble, possibly quartzite or feldspar-rich granite
Quartz–feldspar aggregate; identification is uncertain from the photograph
igneous
Granite
Intrusive Igneous Rock
igneous
Clear Quartz
Silicon Dioxide (SiO2)
mineral
Orbicular jasper (likely ocean jasper)
Silica-rich microcrystalline quartz/chalcedony with feldspar and accessory minerals; composition varies
mineral
Epidote (Unakite component) / Green Quartzite
Ca2(Al,Fe)3(SiO4)3(OH)
metamorphic
Green Fluorite with Galena
Calcium Fluoride (CaF2) with Lead Sulfide (PbS)
mineral
Milky Quartz
Quartz (Silicon Dioxide, SiO2)
mineral
Amethyst
Amethyst (Silicon Dioxide, SiO2 + Fe4+)
mineral
Copper-bearing Quartz (with Malachite and Iron Oxides)
Quartz (SiO2) with Malachite (Cu2CO3(OH)2) and Hematite/Limonite (Fe2O3)
Mineral Specimen
Biotite on Matrix
Biotite (K(Mg,Fe)3AlSi3O10(F,OH)2)
mineral
Amethyst Quartz
Silicon Dioxide (SiO2)
mineral
Mixed tumbled gemstone collection
Varied minerals, likely including amethyst, sodalite/lapis lazuli, quartzite or aventurine, jasper, and agate/chalcedony
gemstone
Petrified Wood
Silicified Wood (SiO2)
mineral
Fossil Shark Tooth
Carcharocles (Otodus) sp. or similar fossilized Chondrichthyes tooth
sedimentary
Amethyst-bearing quartz (likely polished or naturally fractured)
Quartz, silicon dioxide (SiO₂), purple variety colored mainly by iron-related defects
mineral
Fossil Shell (Bivalve)
Class Bivalvia (fossilized)
fossil
Banded gneiss pebble
Biotite–quartz–feldspar gneiss (composition variable)
metamorphic
Sandstone (Quartzose)
Arenite (primarily SiO2)
sedimentary
Red Jasper
Silicon Dioxide (SiO2) with iron oxide inclusions
mineral