Common Opal
Hydrated Amorphous Silica (SiO2·nH2O)
Category
Browse mineral like industrial smelting waste specimens identified by the Rock Identifier community.
Common Opal
Hydrated Amorphous Silica (SiO2·nH2O)
Schist (Kyanite Schist)
Kyanite-Mica Schist (primarily Al2SiO5, KAl2(AlSi3O10)(OH)2, and SiO2)
Granitic Gneiss
Gneiss (High-grade metamorphic rock)
Sandstone (likely Arkosic)
Clastic Sedimentary Rock
Sandstone (likely Arkosic or Quartzose)
Sandstone (SiO2 dominated)
Quartz
Silicon Dioxide (SiO2)
Amethyst (Raw Quartz)
Silicon Dioxide (SiO2) with iron impurities
Gneiss
Gneiss
Granite (Polished Pebble)
Phaneritic Plutonic Rock (primarily Orthoclase and Quartz)
Smoky Quartz on Feldspar (Granite Pegmatite)
Silicon Dioxide (SiO2) with Potassium Aluminum Silicate (KAlSi3O8)
Gneiss
High-grade regional metamorphic rock (Foliated)
Sandstone (specifically Banded Sandstone)
Clastic sedimentary rock (primarily SiO2)
Granodiorite Core
Granodiorite
Amygdaloidal Basalt
Amygdaloidal Basalt containing Zeolite or Quartz (SiO2/Silicates)
Rutilated Quartz
Silicon Dioxide with Titanium Dioxide (SiO2 with TiO2 inclusions)
Potassium Feldspar
K-Feldspar (KAlSi3O8)
Muscovite Mica
Muscovite (KAl2(AlSi3O10)(OH)2)
Quartz (Smoky/Milky variety)
Silicon Dioxide (SiO2)
Malachite
Copper carbonate hydroxide, Cu2CO3(OH)2
Obsidian
Obsidian (principally SiO2 + MgO, Fe3O4)
Blue Quartzite (Aventurine variety)
Silicon Dioxide (SiO2) with inclusions of Dumortierite or Magnesio-riebeckite
Sandstone
Arenite (SiO2 based)
Green Aventurine
Silicon Dioxide (SiO2) with inclusions of Fuchsite (K(Al,Cr)2(AlSi3O10)(OH)2)
Prehnite
Calcium aluminum silicate hydroxide - Ca2Al(AlSi3O10)(OH)2
Sandstone or Limestone
Arenite or Calcareous Sedimentary Rock
Sandstone (likely Quartzose Sandstone)
Arenite (primarily SiO2)
Schist
Mica Schist
Hypersthene
Hypersthene (formula: (Mg,Fe)SiO3)
Sandstone (likely Quartz Sandstone)
Arenite (composed primarily of SiO2)
Pyrite (Fool's Gold)
Iron Disulfide (FeS2)
Dendritic Opal
Opalized Chalcedony with Manganese Inclusions (SiO2 · nH2O)
Schist (Micaceous Schist)
Schist (comprising Muscovite/Biotite mica, Quartz, and Feldspar)
Banded Gneiss
Gneiss (High-grade regional metamorphic rock)
Diorite
Phaneritic plutonic rock (dominated by plagioclase feldspar and hornblende)
Limonite with Hematite
Hydrated Iron(III) Oxide-Hydroxide (FeO(OH)·nH2O)
Milky Quartz
Quartz (Silicon Dioxide - SiO2)
Quartz (specifically Milky or Clear Quartz fragment)
Silicon Dioxide (SiO2)
Smoky Quartz
Silicon Dioxide (SiO2)
Petrified Wood
Silicified Wood (primarily SiO2)
Petrified Wood (Silicified Wood)
Silicified Wood (primarily Chalcedony/Quartz, SiO2)
Rough Amber (likely Copal or immature Amber)
Organic gemstone / Succinite (if Baltic)
Quartz
Silicon Dioxide (SiO2)