Slate
Slate (foliated metamorphic rock)
metamorphic
Category
Man Made Object (Ring)
Browse man made object (ring) specimens identified by the Rock Identifier community.
Learn about Man Made Object (Ring) in the encyclopedia
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Green Chalcedony (Green Agate)
Silicon Dioxide (SiO2)
mineral
Fossilized Sea Urchin Spines
Echinoidea (Cidaroid spines)
sedimentary
Goldstone (blue-goldstone–style glass) beads
Artificial aventurine glass, typically silica glass with copper inclusions; not a natural mineral
mineral
Standing Liberty Quarter (Silver Specimen)
Native Silver alloy (Ag with Cu traces)
mineral
Petrified Wood / Red Jasper
Silicified wood (primarily Silicon Dioxide, SiO2)
sedimentary
Pumice
Pumice (Amorphous volcanic glass)
igneous
Pumice
Pumice (a volcanic glass, primarily SiO2)
igneous
Diamond (in a gold setting)
Carbon (C)
mineral
Tumbled carnelian
Carnelian, a translucent orange-red variety of chalcedony (microcrystalline quartz), SiO₂
gemstone
Carnelian (orange chalcedony)
Chalcedony, microcrystalline quartz (SiO₂), iron-oxide colored
gemstone
Petrified Wood
Silicified Wood (primarily SiO2)
sedimentary
Diamond
Diamond (pure Carbon, C)
mineral
Blue calcite sphere
Calcite (CaCO₃), commonly blue-calcite variety
mineral
Wishing Stone
Greenschist or Basalt with Quartz/Calcite Vein
metamorphic
Fossilized shell or coral fragment
Indeterminate biogenic carbonate; likely calcite/aragonite (CaCO₃)
fossil
Weathered fossilized wood (likely petrified wood)
Silicified wood; commonly quartz/chalcedony replacing wood tissue (SiO₂)
fossil
Petrified wood (polished/cut slab)
Silicified fossil wood, commonly quartz/chalcedony (SiO₂) replacing wood tissue
fossil
Stone bead bracelet
Unidentified polished natural-stone beads; possibly wood-grain jasper, agate, or serpentine
mineral
Flint or chert, possibly a knapped stone tool
Microcrystalline quartz (SiO₂), commonly chalcedony with possible carbonaceous impurities
sedimentary
Petrified wood
Silicified wood; commonly quartz (SiO₂) replacing wood tissue
fossil
Petrified wood
Silicified fossil wood, commonly quartz/chalcedony (SiO₂)
fossil
Garnet (Pyrope or Almandine)
Silicate (X3Y2Si3O12)
mineral
Blue Agate Ring
Silicon Dioxide (Chalcedony variety Agate), SiO2
gemstone
Unable to identify - Image contains non-geological items
N/A
Likely iron-rich concretion or weathered rock pebble
Uncertain from the image; possibly an iron-oxide-cemented concretion (goethite/hematite)
sedimentary
Blue Chalcedony
Microcrystalline Quartz (SiO2)
mineral
Tumbled orange chalcedony (probable carnelian)
Cryptocrystalline quartz, SiO₂; reddish-orange variety commonly called carnelian
gemstone
Carnelian
Carnelian (a variety of Chalcedony, which is a microcrystalline quartz, SiO2)
Mineral (variety of Chalcedony)
Moonstone
Orthoclase Feldspar (KAlSi3O8) or Albite mixtures
mineral
Star sapphire ring
Corundum (Al₂O₃), likely asteriated sapphire
gemstone
Faceted brown gemstone ring, likely smoky quartz
Smoky quartz (SiO₂), identification uncertain from the image
gemstone
Carved labradorite fish
Labradorite, calcium-rich plagioclase feldspar (approximately (Ca,Na)(Al,Si)₄O₈)
mineral
Petrified Wood
Silicified Wood (Permineralized organic matter, głównie $SiO_2$)
fossil
Jasper
Microcrystalline Quartz (SiO2)
sedimentary
Banded Sandstone (Liesegang Rings)
Sedimentary sandstone with Iron oxide precipitates
sedimentary
Petrified Wood
Silicified Wood (SiO2)
sedimentary
Painted River Rock (likely Quartzite or Granite)
Quartzite or Granitic Gneiss (painted)
metamorphic
Siltstone or Limestone Beach Pebble
Siltstone / Micritic Limestone
sedimentary
Quartzite Pebble
Metamorphosed Quartz Sandstone (SiO2)
metamorphic
Carnelian
Orange-red chalcedony (microcrystalline quartz, SiO₂)
gemstone
Ruby in Fuchsite
Corundum (Al2O3) in Chromium-rich Muscovite (K(Al,Cr)2(AlSi3O10)(OH)2)
metamorphic