River Pebble (Siltstone/Mudstone)
Clastic sedimentary rock
Category
Browse mineralogical specimen specimens identified by the Rock Identifier community.
River Pebble (Siltstone/Mudstone)
Clastic sedimentary rock
Smoky Quartz occurring with Feldspar
Silicon Dioxide (SiO2) with Potassium Aluminum Silicate (KAlSi3O8)
Yellow Chalcedony (Agate or Citrine Quartz)
Silicon Dioxide (SiO2)
Quartz (Agate/Chalcedony variety)
Silicon Dioxide (SiO2)
Jasper in Quartz (River Cobble)
Silicon Dioxide (SiO2) with Ferric Iron inclusions
Jasper (Iron-stained Chert)
Silicon Dioxide (SiO2) with iron oxide inclusions
Yellow Jasper
Silicon Dioxide (SiO2) with iron oxide inclusions
Clear Quartz
Silicon Dioxide (SiO2)
Prehnite
Prehnite (Ca2Al2Si3O10(OH)2)
Quartz
Crystalline Silicon Dioxide (SiO2)
Quartz
Silicon Dioxide (SiO2)
Peanut Wood
Silicified (Petrified) Wood - SiO2 (Silicon Dioxide)
Copper Nugget
Native Copper (Cu)
Chevron Amethyst
Silicon dioxide, SiO2 (Quartz variety)
Amethyst (Geode Fragment)
Silicon Dioxide with iron impurities (SiO2)
Quartz Crystal Cluster
Silicon Dioxide (SiO2)
Peacock Ore
Bornite (Cu5FeS4) or Chalcopyrite treated with acid
Pink Opal
Hydrated Silica (SiO2·nH2O)
Amethyst
Silicon Dioxide (SiO2) with trace Iron (Fe3+)
Labradorite
(Ca,Na)(Al,Si)4O8
Prehnite
Prehnite (Ca2Al(AlSi3O10)(OH)2)
Moss Agate
Silicon Dioxide with inclusions (SiO2 + Fe/Mg/Mn/Chlorite)
Amazonite
Microcline (KAlSi3O8)
Yellow Agate
Silicon Dioxide (SiO2)
Quartz (Druzy/Crystalline)
Silicon Dioxide (SiO2)
Petrified Wood
Silicified Wood (primarily SiO2)
Chalcedony (Agate/Chert variety)
Silicon Dioxide (SiO2)
Clear Quartz (Rock Crystal)
Silicon Dioxide (SiO2)
Amethyst (Tumbled/Water-worn)
Silicon Dioxide (SiO2)
Milky Quartz (Stained with Iron)
Silicon Dioxide (SiO2)
Tanzanite (Rough)
Blue Zoisite (Ca2Al3(SiO4)3(OH))
Chert (with Limestone matrix)
Silicon dioxide (SiO2)
Tektite (Indochinite)
Tektite (Amorphous Meteoritic Glass)
Moldavite
Tektite (Impact Glass), ~80% SiO2 + Al2O3
Stichtite in Serpentine (Atlantasite)
Mg6Cr2CO3(OH)16·4H2O in Mg3Si2O5(OH)4
Petrified Wood
Silicified Wood (SiO2)
Yellow Jasper
Jasper (Silica-rich Microcrystalline Quartz, SiO2 with Iron impurities)
Dendritic Moss Agate
Chalcedony (Silicon Dioxide, SiO2) with inclusions
Titanium Aura Quartz (Bismuth-coated Druzy)
Silicon Dioxide (SiO2) with Titanium/Metal vapor coating
Vanadinite on Matrix
Vanadinite (Pb5(VO4)3Cl)
Charoite
Charoite, K(Ca,Na)2Si4O10(OH,F)·H2O
Chalcedony (Yellow Agate)
Cryptocrystalline Quartz (SiO2)