Quartz / Quartzite
Silicon Dioxide (SiO2)
Mineral / Metamorphic
Category
Industrial Byproduct (Often Mistaken For Obsidian Or Mineral)
Browse industrial byproduct (often mistaken for obsidian or mineral) specimens identified by the Rock Identifier community.
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Blue Anhydrite
Anhydrite (CaSO4)
mineral
Sapphire
Corundum (Al2O3)
Mineral
Satin Spar (often marketed as Selenite)
Gypsum (Calcium Sulfate Dihydrate) - CaSO4·2H2O
mineral
Quartz Vein with Host Rock (Greywacke/Siltstone)
Silicon Dioxide (SiO2) within Clastic Sedimentary/Metamorphic Matrix
metamorphic
Blue Sapphire
Corundum (Al2O3)
mineral
Quartz (Double-Terminated)
Silicon Dioxide (SiO2)
mineral
Agate (Thunderegg segment)
Silicon dioxide (SiO2) - Microcrystalline Quartz/Chalcedony
mineral
Olivine (Peridot)
Magnesium Iron Silicate (Mg,Fe)2SiO4
mineral
Shale (Beach-worn)
Laminated Pelite (primarily clay minerals and quartz)
sedimentary
Rough Diamond
Native Carbon (C)
mineral
Agate
Cryptocrystalline Quartz (SiO2)
mineral
Basalt
Basalt
igneous
Rutilated Quartz
Quartz (SiO2) with Rutile (TiO2) inclusions
Mineral
Goldstone
N/A (Synthetic Glass with Copper Inclusions)
Manufactured Glass
Agate
Silicon Dioxide (SiO2) - variety of Chalcedony
mineral
Garnet (likely Almandine)
Almandine (Fe3Al2(SiO4)3)
mineral
Chert (Chert Nodule)
Silicon Dioxide (SiO2)
sedimentary
Sandstone
Arenite (primarily Quartz, SiO2)
sedimentary
Green Fluorite
Calcium Fluoride (CaF2)
mineral
Banded Agate (specifically Sardonyx or Red Agate)
Silicon Dioxide (SiO2)
mineral
Schist
Mica Schist (primarily Muscovite and Quartz)
metamorphic
Olivine (Peridot)
Magnesium Iron Silicate (Mg, Fe)2SiO4
mineral
Blue Sapphire
Corundum (Al2O3 - Aluminum Oxide with Iron and Titanium impurities)
mineral
Chert (Jasper/Agate variety)
Silicon Dioxide (SiO2)
sedimentary
Agate
Silicon Dioxide (SiO2) - Chalcedony variety
mineral
Greywacke (Sandstone)
Lithic wacke
sedimentary
Pyrope Garnet (Bohemian Garnets)
Pyrope (from the group Mg3Al2(SiO4)3)
mineral
Tumbled Clear Quartz and Citrine Points
Silicon Dioxide (SiO2)
mineral
Quartz Pebble
Quartz (Silicon Dioxide, SiO2)
mineral
Beryl (Emerald variety in host rock)
Be3Al2(SiO3)6 (Silicate mineral)
mineral
Green Druzy Quartz (Prasiolite)
Silicon Dioxide (SiO2) with inclusions (typically Chlorite or Actinolite)
mineral
Quartzite
Quartzite (SiO2)
metamorphic
Rose Quartz
Silicon Dioxide (SiO2)
mineral
Anthracite Coal
Anthracite (Carbon-based metamorphic rock)
metamorphic
Ferruginous Sandstone (Ironstone)
Iron-rich Arenite
sedimentary
Quartz (milky variety)
SiO2 (Silicon Dioxide)
Mineral
Sodalite
Sodium Aluminum Silicate Chloride (Na8(Al6Si6O24)Cl2)
mineral
Schist (Chlorite or Mica-rich)
Chlorite Schist
metamorphic
Ferruginous Sandstone (Gozzan-like)
Ferruginous Sandstone (SiO2 with FeO(OH) inclusions)
sedimentary
Blue Crackle Quartz (Dyed Fire Agate/Quartz)
Silicon Dioxide (SiO2) with artificial dye treatment
mineral
Fluorite (Green Fluorite)
Calcium Fluoride (CaF2)
mineral