Fossilized Shark Tooth
Carcharocles sp. or Striatolamia sp. (Phosphate/Carbonate mineralized Hydroxyapatite)
sedimentary
Category
Mineral Based Human Made Alloy
Browse mineral based human made alloy specimens identified by the Rock Identifier community.
Learn about Mineral Based Human Made Alloy in the encyclopedia
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Chert (Flint)
Chert (SiO2)
sedimentary
Chert (Arrowhead Fragment)
Microcrystalline Quartz (SiO2)
sedimentary
Basalt
Basalt
igneous
Coquina
Bioclastic Limestone
sedimentary
Quartz (Water-worn Pebble)
Quartz (Silicon Dioxide, SiO2)
mineral
Dragon Vein Agate
Chalcedony (cryptocrystalline Quartz), SiO2
mineral
Unable to Identify (Image Obscured)
Indeterminate
Aquamarine
Beryl (Be3Al2Si6O18)
mineral
Likely yellow quartz gemstone ring
Quartz (SiO₂), possibly heat-treated citrine or lemon quartz; metal setting appears to be brass/gold-colored alloy
gemstone
Brick
Fired clay or Ceramic material (no specific mineralogical scientific name as it's a composite)
Man-made material (constructed)
Iron Meteorite
Siderite (Iron-Nickel Alloy)
mineral
Chert (Nodule)
Silicon Dioxide (SiO2) - Cryptocrystalline Quartz
sedimentary
Cupronickel (on a 1981 Mexico 20 Pesos coin)
Copper-Nickel Alloy (Cu75Ni25)
mineral
Iron Meteorite
Siderite (Iron-Nickel Alloy)
mineral
Snowflake Obsidian
Volcanic glass with Cristobalite inclusions (70–75% SiO2)
igneous
Aura Quartz Geode (Angel Aura Quartz)
Silicon Dioxide (SiO2) bonded with precious metals
mineral
Rose Quartz
Silicon Dioxide (SiO2) with trace titanium, iron, or manganese
mineral
Sandstone
Arenite
sedimentary
Slag Glass
Anthropogenic Amorphous Silicon Dioxide
mineral
N/A - Non-Geological Item
not a rock/mineral
Coquina
Bioclastic Limestone (composed primarily of CaCO3)
sedimentary
Note: No specimen visible
N/A
Muscovite Mica in Quartz
Potassium Aluminum Silicate Hydroxide (KAl2(AlSi3O10)(OH)2) and Silicon Dioxide (SiO2)
metamorphic
Aura Amethyst (Dyed/Coated)
Titanium-treated Silicon Dioxide (SiO2)
mineral
Amethyst (vibrant lilac/purple variety)
Silicon Dioxide (SiO2) with iron impurities
mineral
Chert (Jasper/Flint variety)
Microcrystalline Quartz (SiO2)
sedimentary
Diorite (River Pebble)
Intermediate Phaneritic Igneous Rock
igneous
Porcelain (Kaolin-based)
Alumina silicate ceramic (composed primarily of Kaolinite: Al2Si2O5(OH)4)
metamorphic (man-made/engineered)
Chert (Flint variety)
Chert (Microcrystalline or Cryptocrystalline Quartz), SiO2
sedimentary
Biotite Mica
Biotite (K(Mg,Fe)3AlSi3O10(OH,F)2)
mineral
Orange Calcite
Calcium Carbonate (CaCO3)
mineral
Granite (Leucogranite)
Felsic Plutonic Rock (Granite)
igneous
Chert (varieties include Flint and Mudstone)
Microcrystalline Silica (SiO2)
sedimentary
Chert (Flint)
Silicon Dioxide (SiO2)
sedimentary
Hag Stone
Perforated Sedimentary Rock / Flint / Limestone
sedimentary
Slag
Anthropogenic glassy silicate
Mineral-like byproduct
Pink Granite
Phaneritic Felsic Intrusive Igneous Rock
igneous
Citrine (Heat-Treated Amethyst)
Silicon Dioxide (SiO2)
mineral
Carved quartz skull, likely smoky quartz or gray chalcedony
Silicon dioxide (SiO₂), quartz or microcrystalline quartz
gemstone
Iron Slag
Iron/Steel Slag (Ferrosilicate Glass)
industrial byproduct (anthropogenic material)
Dyed Dragon Vein Agate
Silicon Dioxide (SiO2) with artificial pigment
mineral