Tumbled blue glassy mineral, possibly sodalite or blue aventurine
Identification uncertain; likely sodalite (Na₈Al₆Si₆O₂₄Cl₂) or blue-dyed quartz/slag-like material
mineral
Category
Not A Natural Rock
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Diamond
Diamond (pure carbon, C)
mineral
Diamond (Princess Cut Faceted Gemstone)
Native Carbon (C)
mineral
Citrine Quartz
Silicon Dioxide (SiO2) with iron impurities
mineral
Dark rounded pebble, likely basalt or slag
Probable fine-grained mafic rock; possibly basalt (plagioclase–pyroxene) or industrial iron/steel slag
igneous
Snowflake Obsidian
Volcanic Glass (SiO2 rich with Cristobalite inclusions)
igneous
Dinosaur Claw Fossil
Fossilized Theropod Claw (Vertebrate Palaeontological Specimen)
fossil
Likely weathered basalt or mafic volcanic rock
Basalt; chiefly plagioclase feldspar, pyroxene, and commonly olivine or iron oxides
igneous
Orange Crackle Quartz
Silicon Dioxide (SiO2) with thermal fracturing
mineral
Amber (and Citrine Quartz)
Succinite (Amber) and Silicon Dioxide (SiO2)
Organic Mineraloid and Mineral
Earthy Hematite / Goethite Surface
Iron Oxide (Fe2O3 – α-FeO(OH))
mineral
Limonite/goethite-rich ironstone (probable)
Limonite, chiefly hydrated iron oxides; commonly goethite, α-FeO(OH), with possible quartz or host-rock inclusions
mineral
Quartz Geode (Chalcedony)
Silicon Dioxide (SiO2)
mineral
Tektite
Natural impact glass
meteorite
Diamond (Cut Gemstone)
Natural Carbon (C)
gemstone
Slag Glass
Vitreous Silicate Residue
industrial byproduct (anthropogenic rock)
Moss Agate
SiO2 with impurities (Chalcedony)
Mineral/Gemstone
Dark river pebble, likely basalt or fine-grained volcanic rock
Basalt (probable); mostly plagioclase and pyroxene, with possible magnetite
igneous
Ruby (Corundum)
Corundum (Aluminum Oxide with Chromium), Al2O3:Cr
mineral
Amethyst (Water-Worn Pebble)
Silicon Dioxide (SiO2 with iron impurities)
mineral
Raw Citrine
Citrine (Silicon Dioxide - SiO2)
mineral
Citrine Quartz
Silicon Dioxide (SiO2)
mineral
Obsidian
Obsidian (volcanic glass, amorphous silica rich rock)
Igneous
Aura Quartz
Titanium-coated Silicon Dioxide (SiO2)
mineral
Chert / Flint Nodule
Microcrystalline quartz (SiO2)
sedimentary
Chert
Microcrystalline quartz (SiO2)
sedimentary
Conglomerate
Polymictic Conglomerate
sedimentary
Quartzite pebble
Quartzite (SiO2)
metamorphic
Rose Quartz
Silicon Dioxide (SiO2)
mineral
Chert
Microcrystalline Quartz (SiO2)
sedimentary
Blue Agate (Dyed)
Silicon Dioxide (Chalcedony), SiO2
gemstone
Diamond
Diamond (C)
gemstone
Heart-shaped River Pebble (Chert/Quartzite)
Cryptocrystalline Quartz (SiO2) / Chert Pebble
sedimentary
Dyed Howlite (often sold as 'Turquenite')
Calcium Borosilicate Hydroxide (Ca2B5SiO9(OH)5)
mineral
Halite
Sodium Chloride (NaCl)
Mineral
Chert / Flint
Silicon dioxide (Microcrystalline Quartz, $SiO_2$)
sedimentary
Quartzite Pebble
Metamorphic Quartzite
metamorphic
Quartzite
SiO2 (Silicon Dioxide / Metamorphic Quartz)
metamorphic
Chert (Vuggy or Weathered)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
![Turquoise (Hydrated phosphate of copper and aluminium [CuAl6(PO4)4(OH)8·4H2O]) — Mineral](https://media.rockidentification.com/93306e99-639b-48d3-a99c-0b95cec08800-thumbnail.jpg)
Turquoise
Hydrated phosphate of copper and aluminium [CuAl6(PO4)4(OH)8·4H2O]
Mineral
Dyed Imperial Jasper (Sea Sediment Jasper)
Silicon Dioxide (SiO2) - Impure Quartz/Chalcedony
sedimentary
Obsidian
Obsidian (principally SiO2 + MgO, Fe3O4)
igneous