Quartz (specifically Milky or Clear Quartz)
Silicon Dioxide (SiO2)
mineral
Category
Synthetic Or Natural Fiber
Browse synthetic or natural fiber specimens identified by the Rock Identifier community.
Learn about Synthetic Or Natural Fiber in the encyclopedia
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Cubic Zirconia (CZ)
Cubic Zirconium Dioxide (ZrO2)
gemstone
Smoky Quartz
Silicon Dioxide (SiO2)
mineral
Quartzite (Quartz Vein)
SiO2 (Silicon Dioxide)
metamorphic
![Turquoise (Hydrated phosphate of copper and aluminium [CuAl6(PO4)4(OH)8·4H2O]) — mineral](https://media.rockidentification.com/bd94961c-533a-4ed4-b8e1-773f9b478c18-thumbnail.jpg)
Turquoise
Hydrated phosphate of copper and aluminium [CuAl6(PO4)4(OH)8·4H2O]
mineral
Amethyst
Amethyst (Silicon Dioxide - SiO2 with impurities of Fe3+)
mineral
Rough Corundum (likely Sapphire/Zircon-bearing)
Aluminium Oxide (Al2O3)
mineral
River Stone (likely Mudstone or Siltstone)
Lutite (Clastic sedimentary rock composed of clay and silt-sized particles)
sedimentary
Yellow Quartz / Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Granite
Phaneritic Plutonic Felsic Rock
igneous
Nephrite Jade
Nephrite (Ca2(Mg, Fe)5Si8O22(OH)2)
metamorphic
Black Onyx
Silicon Dioxide (SiO2) with carbon impurities
mineral
Pumice
Pumice (Amorphous volcanic glass)
Igneous
Fluorite (Rainbow Fluorite)
Calcium Fluoride (CaF2)
mineral
Yellow Quartz Pebble
Silicon Dioxide (SiO2)
Mineral
Gold Nugget
Native Gold (Au)
mineral
Hand-Drawn Trading Card (Amateur Artwork)
Cellulose-based substrate with wax/graphite/ink deposit (n/a for minerals)
Organic/Synthetic Composite (Paper and Pigment)
Quartzite
Quartzite (primarily SiO2)
metamorphic
Amethyst (Tumbled)
Amethyst (Silicon Dioxide with Iron impurities) - SiO2
mineral
Smoky Quartz (Tumbled)
Silicon Dioxide (SiO2)
mineral
Amethyst
Silicon Dioxide with iron impurities (SiO2)
mineral
Amethyst (Tumbled Quarz)
Silicon Dioxide (SiO2) with iron impurities
mineral
Amethyst (Variety of Quartz)
Silicon Dioxide (SiO2) with iron impurities
mineral
Multi-gemstone Quartz and Fluorite Bracelet
Silicon Dioxide (SiO2) and Calcium Fluoride (CaF2)
mineral
Chert (Arrowhead or Projectile Point)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Slate
Foliated Metamorphic Rock (primarily composed of quartz, illite, chlorite, and micas)
metamorphic
Glauconitic Sandstone (or Greensand)
Glauconitic Siliciclastic Rock (Containing (K,Na)(Fe,Al,Mg)2(Si,Al)4O10(OH)2)
sedimentary
Green Aventurine
Quartz (Silicon Dioxide) with Fuchsite inclusions (SiO2 + K(Al,Cr)2(AlSi3O10)(OH)2)
mineral
Coral Rock (Coquina)
Biogenic Limestone (Calcium Carbonate - CaCO3)
sedimentary
Green Aventurine (Gua Sha tool)
Quartzite with Fuchsite inclusions (SiO2 + K(Al,Cr)2AlSi3O10(OH)2)
metamorphic
Agate (specifically, multi-colored or pastel-dyed agate)
Silicon dioxide (SiO2) - specifically, a cryptocrystalline variety of quartz known as Chalcedony, with banding classified as Agate. (If it were Fluorite, the chemical formula would be Calcium Fluoride - CaF2).
Mineral
Laterite (iron-rich nodule, possibly Bauxite as a subtype)
Laterite (composed of various minerals including goethite, hematite, gibbsite, etc.)
Sedimentary
Amethyst
Amethyst (Silicon Dioxide - SiO2 with iron impurities)
mineral
Quartz (Milky Quartz)
Silicon Dioxide (SiO2)
mineral
Alexandrite
Chrysoberyl (BeAl2O4)
mineral
Citrine
Quartz (SiO2) - variety Citrine
Mineral
Carnelian
Carnelian (Silicon Dioxide - SiO2 with Hematite impurities)
Mineral
Apache Tear
Obsidian (Hydrated Volcanic Glass, SiO2)
igneous
Turquoise
Hydrated phosphate of copper and aluminium, CuAl6(PO4)4(OH)8·4H2O
mineral
Black Onyx
Chalcedony (Silicon Dioxide, SiO2)
mineral
Banded Agate (Onyx type)
Silicon Dioxide (SiO2) - Cryptocrystalline Quartz
mineral
Green Druzy Quartz (Prasiolite)
Silicon Dioxide (SiO2) with inclusions (typically Chlorite or Actinolite)
mineral