Clear Quartz Crystal
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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Sandstone (likely Arkosic or Quartzose)
Sandstone (SiO2 dominated)
sedimentary
Hag Stone
Perforated Sedimentary Rock (typically Limestone or Sandstone)
sedimentary
Gold Nugget
Native Gold (Au)
mineral
Granite (Weathered)
Plutonic Igneous Rock (Granitic)
igneous
Sandstone
Arenite (SiO2 primarily)
sedimentary
Blue Agate (Dyed Chalcedony)
Silicon Dioxide (SiO2)
mineral
Concrete
Anthropogenic Sedimentary Conglomerate (Cement mixture: typically Ca2SiO4, Ca3SiO5, Ca3Al2O6)
sedimentary (artificial)
Aura Quartz (Pink/Rose Aura Quartz)
Silicon Dioxide (SiO2) bonded with Platinum and/or Silver
mineral
Sandstone
Sandstone (principally SiO2)
sedimentary
Sandstone (Ferruginous)
Arenite (composed primarily of SiO2 with Fe2O3 staining)
sedimentary
Blue Agate (Dyed)
Silicon Dioxide (SiO2) - Cryptocrystalline Quartz
mineral
Chert (Flint)
Microcrystalline Quartz (SiO2)
sedimentary
Citrine Quartz
Silicon Dioxide (SiO2)
mineral
Diamond (or high-refractive faceted gemstone)
Carbon; C
mineral
Chert Nodule (with Ironstone Cortex)
Microcrystalline Silica (SiO2)
sedimentary
Green Aventurine
Silicon Dioxide (SiO2) with inclusions of Fuchsite
metamorphic
Sandstone
Clastic Sedimentary Rock (composed mostly of quartz, SiO2)
sedimentary
Howlite
Calcium borosilicate hydroxide (Ca2B5SiO9(OH)5)
mineral
River Pebble Gravel
Hydrothermally modified Clastic Sediment (mainly Quartzite and Chert)
sedimentary
Stichtite in Serpentine (Atlantisite)
Mg6Cr2CO3(OH)16·4H2O (Stichtite) within Mg3Si2O5(OH)4 (Serpentine)
Metamorphic
Peacock Ore (Chalcopyrite/Bornite)
Bornite (Cu5FeS4) or iridescent treated Chalcopyrite (CuFeS2)
Mineral
Smoky Quartz
Silicon Dioxide (SiO2)
mineral
Citrine Quartz
Silicon Dioxide (SiO2)
mineral
Amethyst
Silicon Dioxide (SiO2) with iron impurities
mineral
Amethyst Cluster
Silicon Dioxide (SiO2) with iron impurities
mineral
Beads (likely glass or man-made material)
N/A (artificial material)
Man-made material, not a natural rock or mineral specimen
Smoky Quartz
Silicon Dioxide (SiO₂)
mineral
Amethyst
SiO2 (Silicon Dioxide with Iron impurities)
mineral
Amethyst (Polished/Carved Crystal)
Silicon Dioxide (SiO2) with trace Iron (Fe)
mineral
Smoky Quartz
Silicon Dioxide (SiO2)
mineral
Amethyst
SiO2 (Silicon Dioxide with Iron impurities)
mineral
Clear Quartz Sphere
Silicon Dioxide (SiO2)
mineral
Smoky Quartz
Silicon Dioxide (SiO2) with aluminum impurities
mineral
Amethyst
Silicon Dioxide (SiO2) with trace Iron impurities
mineral
Amethyst Quartz with Matrix
Silicon Dioxide (SiO2)
mineral
Rough Amethyst
Silicon Dioxide (SiO2) with Iron impurities
mineral
Amethyst
Amethyst (variety of Quartz, SiO2)
mineral
River Chalcedony / Agate
Chalcedony (Silicon Dioxide, SiO2)
mineral
Smoky Quartz
Smoky Quartz (Silicon Dioxide - SiO2)
mineral
Amethyst
Silicon Dioxide (SiO2) with iron impurities
mineral
Smoky Quartz (with inclusions)
Silicon Dioxide (SiO2)
mineral