Quartzite Pebble
Metamorphosed Quartz Sandstone (SiO2)
metamorphic
Category
Man Made Object (Ring)
Browse man made object (ring) specimens identified by the Rock Identifier community.
Petrified Wood
Silicified Wood (primarily SiO2)
sedimentary
Amethyst
Quartz (SiO2) with trace iron impurities
Mineral
Ambergris
Ambrein-rich Calculus
Organic (Pseudo-geological)
Petrified Wood
Silicified wood (primarily Silicon Dioxide, SiO2)
sedimentary
Carnelian (Chalcedony variety)
SiO2 (Silicon Dioxide)
Mineral
Rainbow Hematite (Man-made/Treated)
Tumbled Hematite with Titanium/Anodized coating (Iron(III) oxide, Fe2O3)
mineral
Man-made Blank Ammunition (Brass)
CuZn (Cartridge Brass - roughly 70% Copper, 30% Zinc)
Anticrystalline / Synthetic Alloy
Glass / Silicon Dioxide (Man-made)
SiO2 (Amorphous Silicon Dioxide)
Amorphous Solid
Citrine
Quartz (SiO₂)
mineral
Howlite
Howlite (Calcium borosilicate hydroxide, Ca2B5SiO9(OH)5)
mineral
Petrified Wood
Silicified wood (primarily SiO2 - Silicon Dioxide/Quartz)
metamorphic
Anyolite (Ruby in Zoisite)
Zoisite with inclusions of Corundum; Ca2Al3(SiO4)3(OH) + Al2O3
metamorphic
River Quartzite Siltstone
Quartz-rich Meta-siltstone (SiO2 dominated)
metamorphic
Carnelian (a variety of Chalcedony)
Silicon Dioxide (SiO2) with Iron Oxide impurities
mineral
Banded Agate
Silicon Dioxide (SiO2)
mineral
Diamond (set in jewelry)
Diamond (Carbon, C)
mineral
Garnet
Garnet Group (Silicate mineral); general formula X3Y2(SiO4)3
mineral
Spiny Oyster Shell
Spondylus varians (Biogenic Calcium Carbonate)
mineral
Rutilated Quartz (likely Citrine or Smoky Quartz with Rutile inclusions)
SiO2 with TiO2 inclusions (Quartz with Rutile)
Mineral
Slate
Foliated low-grade metamorphic rock
metamorphic
Pumice
Pumicite (Amorphous Volcanic Glass)
igneous
Petrified Wood
Silicified Wood (SiO2)
metamorphic
Pumice
Pumice (a highly vesicular extrusive igneous rock)
igneous
Man-made Synthetic Material (Not a rock or mineral)
Polyester (Polyethylene terephthalate) / Faux Fur
Synthetic / Textile
Terracotta (Man-made ceramic brick fragment)
Baked clay / High-iron ceramic (Silicate-based ceramic)
Anthropogenic material (Man-made sedimentary mimic)
Man-made Synthetic Material (Costume Faux Fur)
Synthetic Polymer (Polyester/Acrylic)
not a rock
Banded Sandstone
Arenite with Liesegang banding
sedimentary
Calcite (or Alabaster, if truly carved)
Calcium Carbonate (CaCO3)
Mineral/Rock
Optical Calcite
Calcite (Calcium Carbonate, CaCO3)
mineral
Carnelian Agate
Chalcedony (SiO2) with iron oxide inclusions
mineral
Banded Calcite (often sold as 'Mexican Onyx' or 'Green Onyx')
Calcite (Calcium Carbonate, CaCO3)
sedimentary
Banded Calcite or Travertine
Calcium Carbonate (CaCO3)
Sedimentary
Slate
Foliated Metamorphic Rock
metamorphic
Petrified Wood
Silicon Dioxide (SiO2) permineralized organic matter
sedimentary
Ruby in Fuchsite
Corundum (Al2O3) in Chrome-Mica (KAl2(AlSi3O10)(OH)2)
metamorphic
Jade (likely Nephrite Jade based on appearance)
Nephrite (a variety of actinolite, Ca2(Mg,Fe)5Si8O22(OH)2)
Mineral
Black Jasper (Black Onyx substitute)
Silicon Dioxide (SiO2) with carbonaceous impurities
sedimentary (microcrystalline quartz)
Red Jasper
Silicon Dioxide (SiO2)
sedimentary
Unable to Identify (Image Obscured)
Indeterminate
Amethyst
SiO2 (Silicon Dioxide)
Mineral
Terrazzo (with Marble and Granite fragments)
Cementitious or resinous composite containing Calcium Carbonate (CaCO3) and Silicates
sedimentary (man-made composite)