Rhinestone (or glass crystal)
Silicon dioxide (if glass) / Various
Mineral/gemstone imitation
Category
Man Made Material, Not A Natural Rock Or Mineral Specimen
Browse man made material, not a natural rock or mineral specimen specimens identified by the Rock Identifier community.
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Amethyst
Silicon Dioxide (SiO2) with iron impurities
mineral
Mica Schist
Mica Schist (Complex Silicate Rock)
metamorphic
Geode with Quartz/Chalcedony
Silicon Dioxide (SiO2)
sedimentary
Slate
Foliated metamorphic rock
metamorphic
Chert (Polished River Pebble)
Chert (SiO2)
sedimentary
Sandstone
Quartz Arenite / Clastic Sedimentary Rock
sedimentary
Sandstone (Quartzose Sandstone / Feldspathic Sandstone)
SiO2 with minor impurities (Fe2O3, KAlSi3O8)
sedimentary
Orbicular granite (likely rapakivi-type granite)
Granite; chiefly quartz, alkali feldspar, plagioclase, and biotite/hornblende
igneous
Quartz (Milky or Smoky Quartz Pebble)
Silicon Dioxide (SiO2)
mineral
Bivalve Fossil (Shell-bearing Sedimentary Rock)
Class Bivalvia (Phylum Mollusca) within a Calcarenite/Sandstone matrix
fossil
Copper slag or vesicular basalt with copper minerals
Industrial slag / Basaltic matrix with secondary copper minerals
igneous
Polished orbicular jasper (likely ocean jasper)
Jasper, a microcrystalline variety of quartz (SiO₂), with iron-oxide and other mineral inclusions
mineral
Sandstone
Sedimentary Rock (Quartz arenite)
sedimentary
Chert (Jasper/Flint variety)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Weathered granite or granitic gneiss
Granite: quartz, feldspar, and mica; possibly weakly foliated gneiss
igneous
Limonite (Iron Ore)
Limonite (Hydrous iron(III) oxide-hydroxide mixture, primarily FeO(OH)·nH2O)
mineral
Sandstone (with minor quartz and possible clay components)
Clastic Sedimentary Rock (SiO2 dominated)
sedimentary
Red Sandstone
Arenite (primarily Quartz with Hematite cement)
sedimentary
Silicon Carbide (Carborundum)
Silicon Carbide (SiC)
mineral
Chert (often called Flint or Jasper)
Microcrystalline Quartz (SiO2)
sedimentary
Blue Slag Glass
Amorphous Silica (Byproduct of smelting)
Antropogenic (Man-made)
Rough Diamond
Diamond (Native Carbon, C)
mineral
Quartz Veined Mudstone
Metasedimentary rock with Quartz (SiO2) veins
metamorphic
Quartz (Milky/Crystalline)
Silicon Dioxide (SiO2)
mineral
Quartz (specifically Citrine or Yellow Quartz)
Silicon Dioxide (SiO2)
mineral
Mixed tumbled stone collection
Assorted minerals, likely including quartz, jasper, agate, and possibly obsidian or hematite
mineral
Granitic Gneiss Pebble
Gneiss (felsic metamorphic rock)
metamorphic
Colorless faceted gemstone, likely cubic zirconia
Cubic zirconia (zirconium dioxide, ZrO₂); visual confirmation is unavailable
gemstone
Weathered pegmatite or feldspar-rich granite fragment
Granitic pegmatite, composed mainly of potassium feldspar and quartz, with minor mica; exact identification is uncertain from the photograph
igneous
Sandstone
Arenite (SiO2 based)
sedimentary
Sandstone with Quarzite clasts
Arenite (SiO2 based)
sedimentary
Sandstone
Arenite (primarily SiO2)
sedimentary
Tumbled black-and-white banded stone, likely onyx or agate
Cryptocrystalline quartz (SiO₂), probably banded chalcedony/onyx
mineral
River Stone (likely Mudstone or Siltstone)
Lutite (Clastic sedimentary rock composed of clay and silt-sized particles)
sedimentary
Yellow Quartz Pebble (Citrine or Iron-Stained Quartz)
Silicon Dioxide (SiO2)
mineral
Granite
Phaneritic Plutonic Felsic Rock
igneous
River Pebbles (Chert and Quartzite)
Sedimentary Clastic Rock (Silica-rich)
sedimentary
Sandstone Pebble
Arenite (primarily SiO2)
sedimentary
Rutilated quartz crystal
Quartz, silicon dioxide (SiO₂), containing rutile inclusions (TiO₂)
mineral
Sandstone
Sedimentary Rock (Quartz arenite)
sedimentary
Sandstone
Clastic Sedimentary Rock
sedimentary