Yellow Jasper
Silicon Dioxide (SiO2) with iron oxide inclusions
sedimentary
Category
Mineral Based Composite
Browse mineral based composite specimens identified by the Rock Identifier community.
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Sandstone (likely Fossilized Wood or Concrete Simulacrum)
Arenite / Silicified Wood / Anthropogenic Concrete
sedimentary
Ruby zoisite (anyolite)
Zoisite with corundum (ruby) and commonly amphibole; Ca₂Al₃(SiO₄)₃(OH)
metamorphic
Polished blue copper mineral, likely chrysocolla or dyed howlite
Chrysocolla: hydrated copper phyllosilicate, approximately (Cu,Al)₂H₂Si₂O₅(OH)₄·nH₂O; visual identification is uncertain from the image
mineral
Herkimer Diamond
Quartz (Silicon Dioxide - SiO2)
mineral
Quartz (Water-worn Pebble)
Quartz (Silicon Dioxide, SiO2)
mineral
Asphalt (Bituminous Concrete)
Asphaltum / Bitumen-Aggregate Matrix
Technonatural composite (often containing sedimentary/igneous aggregate)
Breccia
Breccia
sedimentary
Red Painted Rock
Artificial Coated Lithic Fragment
sedimentary
Opal ring
Common opal, likely synthetic or assembled blue-green opal (hydrated amorphous silica, SiO₂·nH₂O)
gemstone
Unable to Identify (Image Obscured)
Indeterminate
Opalite (likely man-made glass)
Opalite is a trade name for opalescent glass, not a natural mineral; composition is typically silica glass with additives
mineral
Rose Quartz
Silicon Dioxide (SiO2) with trace titanium, iron, or manganese
mineral
Copper
Native Copper (Cu)
mineral
Decorative mosaic cross containing mixed rock and glass fragments
Polychrome aggregate; likely quartz, feldspar, marble, granite, and assorted colored glass
mineral
Banded Calcite (Onyx Marble)
Calcite (CaCO3) / Travertine
sedimentary
Sandstone
Arenite
sedimentary
Sandstone
Arenite (SiO2 based typically)
sedimentary
Sandstone
Arenite (SiO2 based typically)
sedimentary
Sandstone
Arenite (SiO2 based with cement)
sedimentary
Amethyst (vibrant lilac/purple variety)
Silicon Dioxide (SiO2) with iron impurities
mineral
Mixed polished gemstone bead bracelet, likely ocean jasper, agate, and quartz varieties
Mostly microcrystalline quartz (SiO₂), with possible chalcedony, jasper, and minor feldspar or other inclusions
gemstone
Sandstone (River Rock)
Arenite (SiO2 based sedimentary rock)
sedimentary
Sandstone (Quartzose)
Arenite (SiO2 based typically)
sedimentary
Biotite Mica
Biotite (K(Mg,Fe)3AlSi3O10(OH,F)2)
mineral
Turquoise ring (likely stabilized or imitation turquoise)
Turquoise, CuAl₆(PO₄)₄(OH)₈·4H₂O; exact material is uncertain from the image
gemstone
Sandstone
Arenite (SiO2 based typically)
sedimentary
Mixed Gemstone and Mineral Collection
Silicon Dioxide (SiO2) based minerals and others
mineral
Mother of Pearl (Nacre)
Aragonite (CaCO3) with Organic Matrix
mineral
Orange Calcite
Calcium Carbonate (CaCO3)
mineral
Fossil crocodilian skull and jaws
Crocodyliform fossil; exact genus and species cannot be determined from the image
fossil
Iron Slag
Anthropogenic Iron oxide/Silicate composite
Mineral-like byproduct (Technogenic)
Red Sandstone
Arenite (SiO2 based with Fe2O3)
sedimentary
Sandstone
Arenite (SiO2 based typically)
sedimentary
Chalcedony (Grey/White Agate)
Silicon Dioxide (SiO₂)
mineral
Sandstone
Arenite (typically SiO2 based)
sedimentary
Hag Stone
Perforated Sedimentary Rock
sedimentary
Milky quartz
Quartz (SiO₂)
mineral
Black Spinel
Magnesium Aluminum Oxide (MgAl2O4)
mineral
Decorative gemstone-chip jewelry (likely turquoise, coral, and assorted beads)
Predominantly turquoise, CuAl₆(PO₄)₄(OH)₈·4H₂O; other pieces appear to be dyed coral or red stone, and possibly shell/metal components
gemstone
Weathered quartz-rich pebble
Likely quartz-bearing vein rock; exact identification requires testing
mineral
Painted Sandstone
Sandstone (clastic sedimentary rock) with acrylic/artistic coating
sedimentary