Obsidian
Obsidian (volcanic glass; primarily SiO2)
igneous
Category
Man Made Object (Ring)
Browse man made object (ring) specimens identified by the Rock Identifier community.
Dalmatian Jasper
Dalmatian Stone (a microcrystalline quartz and feldspar rock with arfvedsonite)
igneous
Jasper
Silicon dioxide (SiO2) with iron oxide and clay inclusions
sedimentary
Green Aventurine
Silicon Dioxide with Fuchsite inclusions (SiO2 + K(Al,Cr)2AlSi3O10(OH)2)
metamorphic
Red Jasper
Silicon Dioxide (SiO2) with iron oxide inclusions
sedimentary
Red Jasper
Jasper (Silicon Dioxide, SiO2)
sedimentary
Carnelian Agate
Silicon Dioxide (SiO2) - variety of Chalcedony
mineral
Carnelian Agate
Silicon Dioxide (SiO2)
mineral
Blue Slag Glass
Amorphous Silica (Industrial byproduct)
Antropogenic (Man-made glass byproduct)
Slag (Industrial Byproduct)
Ferro-silicate glass (Slag)
Anthropogenic (Man-made industrial deposit)
Goldstone (Red)
Aventurine Glass
Man-made material (Simulated Mineral)
Diamond Plate (Steel)
Alloyed Carbon Steel or Aluminum with 'Durbar' pattern
not a rock (Man-made industrial metal)
Blue Goldstone
Aventurine Glass (Silicon Dioxide with metal inclusions)
man-made glass mineral simulant
Sea Glass (Frosted Glass)
Amorphous Silica (SiO2) with various additives
Man-made material (Anthropogenic 'mineraloid')
Iron Slag
Ferrous slag (primarily silicates and oxides of calcium, iron, and magnesium)
Anthropogenic (Man-made industrial byproduct)
Asphalt Chunk (with aggregate)
Bituminous concrete / Anthropogenic conglomerate
sedimentary (anthropogenic/man-made conglomerate)
Green Aura Quartz (Titanium treated Kyanite or Quartz)
Silicon Dioxide (SiO2) or Aluminum Silicate (Al2SiO5) with Titanium/Metal Oxide coating
mineral (man-made aura treatment)
Slag
Ferrous Slag (Siliceous industrial waste)
Anthropogenic (Man-made industrial byproduct)
Sandstone (specifically Picture Sandstone or Wonderstone)
Arenite (composed primarily of SiO2)
sedimentary
Pearl
Calcium carbonate (CaCO3) in the form of aragonite or calcite
mineral
Milky Quartz
Quartz (Silicon Dioxide, SiO2)
mineral
Iceland Spar (Optical Calcite)
Calcite (CaCO3)
mineral
Eye Agate
Silicon Dioxide (SiO2) - Banded Chalcedony
mineral
Black Onyx
Cryptocrystalline Chalcedony (SiO2)
mineral
Bismuth Crystal
Bismuth (Bi)
mineral
Quartz (Microcrystalline/Chert)
Silicon Dioxide (SiO2)
mineral
Granite
Granitoid (KAlSi3O8 – NaAlSi3O8 – CaAl2Si2O8 + SiO2)
igneous
Red Chert (Jasper)
Cryptocrystalline Quartz (SiO2) with iron oxide inclusions
sedimentary
Chert (Jasper/Flint variety)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Flint (or Chert)
Cryptocrystalline Quartz (SiO2)
sedimentary
Desert Rose (Baryte or Gypsum Rose)
Baryte (BaSO4) or Gypsum (CaSO4·2H2O)
mineral
Quartzite (River Pebble)
Quartzite (Mainly SiO2)
metamorphic
Rhodonite
Rhodonite; (Mn,Fe,Mg,Ca)SiO3
Mineral
Rhodonite
Rhodonite (MnSiO3)
Mineral
Fancy Jasper
Chalcedony (cryptocrystalline quartz) with inclusions
Mineral
Tiger's Eye
Silicon dioxide with crocidolite fibers (SiO2 with chrysotile amphibole inclusions)
Mineral
Banded Chert
Microcrystalline Quartz (SiO2)
sedimentary
Sandstone
Arenite (primarily Quartz, SiO2)
sedimentary
Petrified Wood
Silicified Wood (SiO2)
mineral
Petrified Wood
Silicified Wood (SiO2)
mineral
Fossilized Shell in Limestone
Bivalve fossil (CaCO3) in Carbonate Sedimentary Rock
sedimentary
Sandstone (likely Red/Brown Sandstone)
Arenite (SiO2 based)
sedimentary