Quartz (Druzy)
Silicon Dioxide (SiO2)
mineral
Category
Mineraloid (Human Made Geological Specimen)
Browse mineraloid (human made geological specimen) specimens identified by the Rock Identifier community.
Banded Agate (River-worn Pebble)
Cryptocrystalline Silicon Dioxide (SiO2)
sedimentary
Green Quartzite
Quartzite (SiO2)
metamorphic
Milky Quartz
Quartz (Silicon Dioxide, SiO2)
mineral
Stromatolite
Cyanobacteria fossilized formation (CaCO3)
sedimentary
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Garnet
Garnet Group (formula varies, e.g., Almasndine: Fe3Al2(SiO4)3)
mineral
Quartz Mineral
Silicon Dioxide (SiO2)
mineral
Quartz Vein in Host Rock (Gneiss/Schist)
Silicon Dioxide (SiO2) within a metamorphic matrix
metamorphic
Ferruginous Sandstone
Arenite with Hematite/Limonite cement
sedimentary
Beryl (Emerald Variety)
Beryllium aluminum silicate (Be3Al2Si6O18)
mineral
Rugose Coral (Horn Coral)
Order Rugosa (extinct fossilized coral)
sedimentary
Fossiliferous Limestone (with Crinoids)
CaCO3 (Calcium Carbonate)
sedimentary
Mixed collection of Quartz varieties, Chalcedony, and metamorphic pebbles
Mixed gemstones (primarily Silicon Dioxide - SiO2)
mineral
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Rough Green Beryl (Emerald variety)
Beryl (Be3Al2Si6O18 with Chromium/Vanadium impurities)
mineral
Charoite
Charoite (Hydrated potassium sodium calcium barium strontium silicate hydroxyfluoride)
metamorphic
Unakite
Epidotized Granite
metamorphic
Aquamarine
Beryl (Be3Al2Si6O18 with Fe2+ impurities)
mineral
Quartz (Common Milky Quartz)
Silicon Dioxide (SiO2)
mineral
Milky Quartz with Iron Staining
Silicon Dioxide (SiO2)
mineral
Travertine
Calcareous Tufa (CaCO3)
sedimentary
Chalk (Calcitic)
Calcium Carbonate (CaCO3) - Biogenic Sedimentary Rock
sedimentary
Basalt
Mafic volcanic rock (primarily plagioclase feldspar and pyroxene)
igneous
Red Scoria (Lava Rock)
Vesicular Basalt / Scoria
igneous
Quartz / Milky Quartz
Silicon Dioxide (SiO2)
mineral
Quartzite
Quartzite (SiO2)
metamorphic
Mica in Quartz Host
Muscovite (KAl2(AlSi3O10)(OH)2) in Quartz (SiO2)
igneous
Pyrite (Fool's Gold)
Iron Disulfide (FeS2)
mineral
Petrified Wood
Silicified Wood (SiO2 - Quartz/Chalcedony replacement)
Mineral / Fossil
Quartz (Milky Quartz)
Silicon Dioxide (SiO2)
mineral
Pyrite (Fool's Gold)
Iron Sulfide (FeS2)
mineral
Pyrite
Iron Sulfide (FeS2)
mineral
Milky Quartz with Iron Staining and Matrix
Silicon Dioxide (SiO2)
mineral
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Sandstone or Quartzite
Arenite (if sedimentary) / Quartzite (if metamorphic)
Sedimentary or Metamorphic
Quartz (Iron-stained or Milky)
Silicon Dioxide (SiO2)
mineral
Travertine (Calcareous Tufa)
Calcium Carbonate (CaCO3)
sedimentary
Moqui Marble
Iron Oxide Concretion
sedimentary
Sandstone
Arenite (SiO2 primarily)
sedimentary
Pyrite
Pyrite (FeS₂)
Mineral
Porphyritic Basalt
Porphyritic Basalt (with plagioclase phenocrysts)
igneous