Opal
Hydrated Amorphous Silica (SiO2·nH2O)
mineral
Category
Non Geological
Browse non geological specimens identified by the Rock Identifier community.
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Chert (and/or Siltstone River Pebble)
Silicon Dioxide (SiO2) - Microcrystalline Quartz
sedimentary
Chert (specifically Flint or Nodular Chert)
Silicon dioxide (SiO2)
sedimentary
Chert (specifically Chalcedony or Flint variation)
Microcrystalline Quartz (SiO2)
sedimentary
Gold Nugget
Native Gold (Au)
mineral
Raw Emerald in Matrix
Beryl (Be3Al2Si6O18) with Chromium/Vanadium impurities
mineral
Obsidian
Obsidian (volcanic glass)
igneous
Chert
Microcrystalline Quartz (SiO2)
sedimentary
Quartz (Engineered Stone Countertop)
Silicon Dioxide (SiO2) with polymer resins
Sedimentary-like (Industrial Composite)
Pebble / Sandstone / Siltstone
Sedimentary Rock (Quartz Sandstone / Siltstone)
sedimentary
Fossiliferous Rock (likely Dinosaur Fossil in Matrix)
Permineralized Vertebrate Fossil (Calcium Carbonate/Silica replaced bone material)
sedimentary
Granite
Granitoid
igneous
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Siltstone
Siltstone
sedimentary
Zebra Stone (Banded Chert or Limestone)
Silicon Dioxide (SiO2) with Calcium Carbonate (CaCO3) inclusions
sedimentary
Shungite
Non-crystalline carbon (C)
mineral
Shungite
Non-crystalline carbon (Fullerenes)
metamorphic
Quartzite
Quartzite (Recrystallized Quartz Sandstone)
metamorphic
Man-made Metal Pin (Non-geological)
Antimony-Lead Alloy or Zinc/Brass Base with Electroplating
Metal Alloy / Manufactured Artifact
Chalcedony (Agate/Chert variety)
Silicon Dioxide (SiO2)
sedimentary
Pink Anthracite Coal (dyed)
Anthracite Coal (Artificially Colored)
Sedimentary Rock (Altered)
Shungite
Non-crystalline carbonoid (Shungite)
metamorphic
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Clear Quartz
Silicon Dioxide (SiO2)
mineral
Synthetic Faux Fur Fursuit
Polyacrylonitrile / Polyester (Synthetic Textile)
not a rock (synthetic material/costume)
Quartz Geode
Silicon Dioxide (SiO2)
mineral
Hematite-rich Ironstone
Ferruginous Rock (Fe2O3)
sedimentary
Synthetic Costume Glove (Paws)
Polyethylene terephthalate (Polyester) & Polyurethane blend
Non-geological / Man-made textile
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Rutilated Quartz Bracelet
Quartz (Silicon Dioxide, SiO2) with inclusions of Rutile (Titanium Dioxide, TiO2)
gemstone
Siltstone
Siltstone (primarily composed of quartz and clay minerals)
sedimentary
Limonite Pseudomorph after Pyrite
Limonite (Hydrous iron oxides e.g., FeO(OH)·nH2O) pseudomorphing Pyrite (FeS2)
mineral
Zebra Stone (Silicified Siltstone)
Silicified Siltstone with Quartz/Kaolinite inclusions
sedimentary
Slate with Quartz
Low-grade Metamorphic Slate with SiO2 inclusions
metamorphic
Ametrine
Ametrine (SiO2 - Silicon Dioxide with varied iron impurities)
mineral
Quartz Veined Basalt
Mafic Volcanic Rock with Microcrystalline Quartz (SiO2)
igneous
Peridot
Olivine (Mg,Fe)2SiO4
Mineral
Zoisite with Ruby (Anyolite)
Anyolite (Calcium aluminium silicate hydroxide with Corundum)
metamorphic
Chert (River Stone)
Microcrystalline Quartz (SiO2)
sedimentary
Green Quartz / Aventurine
Silicon Dioxide (SiO2) with inclusions
Metamorphic
Native Gold
Gold (Au)
mineral
Fancy Jasper
Silicon Dioxide (SiO2) with impurities
mineral