Clear Quartz (Rock Crystal)
Silicon Dioxide (SiO2)
mineral
Category
Man Made Glass (Not A Natural Rock Or Mineral)
Browse man made glass (not a natural rock or mineral) specimens identified by the Rock Identifier community.
Blue Chalcedony
Silicon Dioxide (SiO2)
mineral
Chalcedony (Agate Pebble)
Silicon Dioxide (SiO2)
mineral
Rose Quartz
Silicon dioxide (SiO2) with trace amounts of titanium, iron, or manganese
mineral
Quartz (Milky/Iron-stained)
Silicon Dioxide (SiO2)
mineral
Blue Lace Agate (often dyed)
Silicon dioxide (SiO2) - variety of chalcedony
mineral
Amethyst
Amethyst (Silicon Dioxide - SiO2 with ferric impurities)
mineral
Emerald
Beryl (Be3Al2(SiO3)6) with Chromium/Vanadium impurities
mineral
Staurolite (Cross Stone)
Staurolite (Fe2+2Al9Si4O23(OH))
metamorphic
Cubic Zirconia
Cubic Zirconium Dioxide (ZrO2)
mineral
Pearl
Calcium Carbonate (CaCO3) in the form of Aragonite
mineral
Gold Nugget / Gold-bearing Quartz
Native Gold (Au)
mineral
Travertine (Tufa)
Terrestrial Sedimentary Limestone (CaCO3)
sedimentary
Limonite (Yellow Ochre)
Limonite (an amorphous mixture of hydrated iron oxides, primarily FeO(OH)·nH2O)
mineral
Granite
Phaneritic Felsic Igneous Rock (Granite)
igneous
Chert (specifically Blue Chert/Flint)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Clear Quartz (Rock Crystal)
Silicon Dioxide (SiO2)
mineral
Amethyst (Chevron Amethyst)
Silicon Dioxide (SiO2) with iron impurities
mineral
Citrine
Silicon dioxide (SiO2) - yellow quartz variety
mineral
Blue Sapphire
Corundum (Al2O3)
mineral
Quartzite Pebble
Metamorphic Quartzite (SiO2)
metamorphic
Orthoclase Feldspar
Potassium Aluminum Silicate (KAlSi3O8)
mineral
Limonite (Iron Ore)
Limonite (FeO(OH)·nH2O)
mineral
Blue Topaz (specifically London Blue shade)
Topaz - Al2SiO4(F,OH)2
mineral
Limonite (Iron Ore)
FeO(OH)·nH2O (Hydrous ferric oxide)
mineral
Milky Quartz (Water-worn Pebble)
Silicon Dioxide (SiO2)
mineral
Ferruginous Chert
Microcrystalline Quartz (SiO2) with Iron Oxides
sedimentary
Pumice (Volcanic Rock)
Vesicular volcanic rock (composed largely of amorphous volcanic glass)
igneous
Yellow Chert or Jasper
Microcrystalline Quartz (SiO2)
sedimentary
Red Jasper (Opaque Chalcedony)
Silicon Dioxide (SiO2) with Iron Oxide (Fe2O3) inclusions
sedimentary
Quartz Geode
Silicon Dioxide (SiO2) within a geode
mineral
Quartzite
Quartzite (primarily SiO2)
metamorphic
Basalt (Amygdaloidal)
Amygdaloidal Basalt
igneous
Ferrochrome Slag
Industrial Glassy Slag (Fe-Cr alloy byproduct)
Antropogenic (Man-made industrial byproduct)
Synthetic Costume Glove (Paws)
Polyethylene terephthalate (Polyester) & Polyurethane blend
Non-geological / Man-made textile
Seraphinite
Clinochlore (a variety of the chlorite group)
mineral
Druzy Quartz on Matrix
Silicon Dioxide (SiO2)
mineral
White Quartzite
Quartzite (primarily SiO2)
metamorphic
Obsidian (Black)
Obsidian (approx. 70–75% SiO2)
igneous
Limonite Concretion (Ironstone)
Limonite (Hydrated Iron(III) Oxide-Hydroxide, FeO(OH)·nH2O)
sedimentary
Quartz
Quartz (Silicon Dioxide - SiO2)
Mineral
Diorite (possibly fine-grained variety or a related intermediate intrusive rock like a felsic gabbro or a dark granodiorite)
Diorite (Igneous rock, intrusive, intermediate composition)
Igneous Rock