Quartzite
Quartzite (SiO2)
metamorphic
Category
Amorphous Solid
Browse amorphous solid specimens identified by the Rock Identifier community.
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Quartzite (specifically an iron-stained or Carnelian-colored variety)
Silicon Dioxide (SiO2) with iron oxide inclusions
metamorphic
Dark volcanic sand / basaltic sand
Basalt-derived lithic sand, chiefly plagioclase, pyroxene, and volcanic glass
igneous
Lunar Meteorite (Feldspathic Breccia)
Achondrite, Lunar Meteorite (Feldspathic Breccia)
igneous
Quartz Vein in Schist
Quartz (SiO2) in Mica Schist
metamorphic
Gastropod Fossil (Snail Internal Mold)
Gastropoda; internal mold (steinkern), often composed of Calcium Carbonate (CaCO3) or Silica (SiO2)
sedimentary
Iron-rich ochre (red/brown hematite pigment)
Hematite, Fe₂O₃, likely mixed with clay and quartz grains
mineral
Chalcedony Geode Fragment
Silicon Dioxide (SiO2) - Microcrystalline Quartz
sedimentary
Quartz with inclusions (likely Tourmaline or Biotite)
Silicon Dioxide (SiO2)
mineral
Earthy iron-oxide-rich mineral coating (probable laterite/limonite)
Hydrated iron oxides and oxyhydroxides, chiefly goethite (FeO(OH)) and limonite (variable FeO(OH)·nH₂O), mixed with clay/sand
mineral
Anthracite coal
Anthracite; predominantly carbon (C), with minor mineral impurities
sedimentary
Tiger's Eye
Pseudomorph of Quartz after Crocidolite (SiO2)
metamorphic
Vesicular basalt (likely scoria)
Mafic volcanic rock; predominantly plagioclase, pyroxene, and volcanic glass, with possible olivine
igneous
Geode Nodules / Keokuk Geode
Quartz / Chalcedony Geode (SiO2)
sedimentary
White Agate (Chalcedony)
Agate (Silicon Dioxide - SiO2)
mineral
Black Onyx
Cryptocrystalline Quartz (SiO2 with organic/iron impurities)
mineral
Black Onyx (Tumbled)
Silicon Dioxide (SiO2)
mineral
Agatized Fossil Coral
SiO2 replacing Anthozoa
fossil
Dendritic Jasper
SiO2 (Microcrystalline Quartz)
mineral
Chert breccia
Sedimentary Breccia (Microcrystalline Quartz)
sedimentary
Ocean Jasper (Orbicular Jasper)
Silicon Dioxide (SiO2) with iron and other impurities
sedimentary
Quartzite Pebble (River Rock)
Metamorphic Quartzite (predominantly SiO2)
metamorphic
Lapis Lazuli (Low Grade)
Lapis Lazuli (Metamorphic rock containing lazurite, calcite, and pyrite)
metamorphic
Composite Turquoise or Reconstituted Turquoise with Copper inclusions
CuAl6(PO4)4(OH)8·4H2O (Turquoise) mixed with matrix and copper/bronze flakes
mineral
Petrified Wood
Petrified Wood (Silicified Wood)
fossil
Petrified Wood
Silicified Wood (primarily SiO2)
sedimentary
Garnet-bearing Schist
Almandine Garnet (Fe3Al2(SiO4)3) in Mica Schist
metamorphic
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Gemstone butterfly brooch/pendant
Likely faceted pink tourmaline or synthetic spinel in gilt metal; exact identification requires testing
gemstone
Gold and Cubic Zirconia (San Judas Tadeo Pendant)
Native Gold (Au) with Synthetic Cubic Zirconia (ZrO2)
mineral
Black Onyx
Silicon Dioxide (SiO2)
mineral
Banded Gneiss
Gneiss (quartz-feldspar-biotite metamorphic rock)
metamorphic
Stichtite in Serpentinite (Atlantisite)
Mg6Cr2CO16(OH)16·4H2O in Mg3Si2O5(OH)4
metamorphic
Quartz Geode
Silicon Dioxide (SiO₂)
mineral
Pallasite Meteorite (likely Imilac or Brenham)
Stony-Iron Meteorite (Pallasite)
mineral
Petrified Wood
Silicified wood (Quartz/Chalcedony replacement of cellulose)
fossil
Petrified Wood
Silicified Wood (SiO2)
fossil
Petrified Wood
Agatized or Silicified Wood (SiO2)
fossil
Petrified Wood
Agatized or Silicified Wood (SiO2)
fossil
Petrified Wood
Silicified Wood (SiO2)
fossil
Black Onyx
Silicon Dioxide (SiO2) - variety of Chalcedony
mineral
Quartz Geode
Macrocrystalline Quartz (SiO2) within a geode structure
mineral