Sea Glass (Kelly Green)
Amorphous Silica (Silicon Dioxide with Iron/Chromium additives)
Anthropogenic specimen (Man-made material)
Category
Non Geological
Browse non geological specimens identified by the Rock Identifier community.
Yellow Ochre / Limonite
Limonite (Hydrated Iron(III) Oxide-Hydroxide, FeO(OH)·nH2O)
mineral
Dyed Quartzite
Tumbled Metamorphosed Quartz (SiO2) with artificial pigment
metamorphic
Man-made Metal Pin (Non-geological)
Antimony-Lead Alloy or Zinc/Brass Base with Electroplating
Metal Alloy / Manufactured Artifact
Polished Ocean Jasper
Orbicular Jasper (variety of Chalcedony/Quartz, SiO2)
mineral
Chondrite Meteorite
Ordinary Chondrite (S-type asteroid origin)
igneous
Turquoise
Hydrated phosphate of copper and aluminum, CuAl6(PO4)4(OH)8·4H2O
mineral
Common Green Opal
Hydrated amorphous silicon dioxide (SiO2·nH2O)
mineral
Gold Ore in Quartz
Native Gold (Au) in Quartz (SiO2)
mineral
Quartzite (River Pebble)
Recrystallized Quartz (SiO2)
metamorphic
Serpentine
Serpentine group minerals (e.g., Antigorite, Chrysotile, Lizardite). Chemical formula: (Mg, Fe)₃Si₂O₅(OH)₄
Mineral, often found as a rock (metamorphic)
Sea Glass (White/Clear)
Amorphous Silica (Alkali-Lime-Silica Glass), SiO2 + Na2O + CaO
Anthropogenic (Man-made product subject to geological processes)
Anthracite Coal
Anthracite
metamorphic
Cullet Glass (Industrial Slag Glass)
Amorphous Silica (SiO2) with metallic oxide impurities
Man-made byproduct (often mistaken for Obsidian or Emerald)
Synthetic Costume Glove (Paws)
Polyethylene terephthalate (Polyester) & Polyurethane blend
Non-geological / Man-made textile
Granite
Granite (Felsic intrusive igneous rock)
igneous
Shungite (Noble/Type II)
Non-crystalline carbon (Fullerene-bearing carbonaceous rock)
metamorphic
Quartzite Arrowhead (Archaeological Lithic)
Recrystallized Quartz (SiO2)
metamorphic
Mookaite Jasper
Mookaite (variety of Chert/Jasper), Silicon Dioxide - SiO2
sedimentary
Sea Glass
Amorphous Silica (SiO2) with various additives
Mineraloid (Anthropogenic)
Chert (specifically Red Chert or Jasper)
Microcrystalline Quartz (SiO2)
sedimentary
Jasper
Silicon dioxide (SiO2)
sedimentary
Vesicular Basalt (or Scoraceous Basalt)
Basalt with vesicular texture
igneous
Hematite
Hematite (Fe2O3)
mineral
Yellow Banded Agate
Silicon Dioxide (SiO₂)
mineral
Chert (specifically tan/pink variety)
Silicon Dioxide (SiO2)
sedimentary
Limonite (Iron Ore)
Limonite (FeO(OH)·nH2O)
mineral
Ferrochrome Slag
Anthropogenic slag (Fe-Cr alloy waste)
industrial byproduct
Sea Glass (Frosted Quartz/Glass)
Amorphous Silicon Dioxide (SiO2)
Mineraloid
Black Jasper (Black Onyx substitute)
Silicon Dioxide (SiO2) with carbonaceous impurities
sedimentary (microcrystalline quartz)
Shungite
Non-crystalline carbon (allotrope of carbon)
metamorphic
Green Quartz (including Prase or Aventurine variants)
Silicon Dioxide (SiO2) with inclusions (likely Actinolite or Chlorite)
mineral
Banded Flint (Polished Stripe Flint)
Silicon Dioxide (SiO2) - variety of Chert
sedimentary
Cinnabar
Mercury(II) sulfide (HgS)
mineral
Slag (Industrial Glass Slag)
Amorphous Silica / Ferro-silicate Slag
mineraloid / anthropogenic
Barite
Barium Sulfate (BaSO4)
mineral
Serpentine (Nephrite-like Serpentine)
Serpentinite (Hydrous magnesium iron phyllosilicate)
metamorphic
Marble
Marble (metamorphosed limestone/dolostone). Predominantly composed of Calcite (CaCO3) for marble derived from limestone, or Dolomite (CaMg(CO3)2) for marble derived from dolostone.
Metamorphic Rock
Rough Emerald in Matrix
Beryl (Be3Al2Si6O18) with trace Chromium/Vanadium
mineral
Bismuth Crystal
Bismuth (Bi)
mineral
Shale or Mudstone (Based on appearance)
Shale (fine-grained, laminated fissile sedimentary rock) / Mudstone (fine-grained, non-fissile sedimentary rock)
Sedimentary
Ferrous Slag (Iron Smelting By-product)
Fused Siliceous Slag
Anthropogenic Material (Man-made Rock)