Ferruginous Quartzite (Iron-stained Quartz)
Silicon Dioxide (SiO2) with Ferric Oxide (Fe2O3)
metamorphic
Category
Man Made Glass (Often Grouped With Minerals In Lapidary)
Browse man made glass (often grouped with minerals in lapidary) specimens identified by the Rock Identifier community.
Aragonite (Star Cluster or Twinned variety)
Aragonite (Calcium Carbonate, CaCO3)
mineral
Chert (varietal Chalcedony or Flint)
Silicon dioxide (SiO2) - Microcrystalline Quartz
sedimentary
Chert (Flint nodule)
Silicon dioxide (SiO2)
sedimentary
Quartz Vein in Host Rock
Silicon Dioxide (SiO2)
mineral
Chert (often called Flint or Jasper)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Petrified Wood
Silicified Wood (SiO2)
metamorphic
Serpentine
Serpentine Group (primarily Antigorite or Lizardite), Mg3Si2O5(OH)4
metamorphic
Malaysian 50 Sen Coin
Coinage (specific alloy unknown without metallurgical analysis, but typically brass or bronze for this denomination and era)
Man-made object (coin)
Mahogany Obsidian
Volcanic Glass with Hematite/Magnetite inclusions
igneous
Serpentine
Serpentinite (group of hydrous magnesium iron phyllosilicate minerals, e.g., Lizardite, Antigorite)
metamorphic
Quartz with Iron Staining
Silicon Dioxide (SiO2) with Hematite/Limonite inclusions
mineral
Quartzite with Iron Inclusions
Metamorphic Quartzite (SiO2 with Fe2O3 trace impurities)
metamorphic
Red Chert (Jasper)
Silicon Dioxide (SiO2)
sedimentary
Epidote
Epidote Group (e.g., Clinozoisite, Epidote, Piemontite), Epidote formula: Ca2(Al,Fe)3(SiO4)3(OH)
Mineral
Slag
Ferrous Slag (Siliceous industrial waste)
Anthropogenic (Man-made industrial byproduct)
Limonite (after Pyrite Pseudomorph)
Limonite (Hydrated Iron Oxide Mixture, FeO(OH)·nH2O)
mineral
Chert (often called Flint when in chalk or limestone)
Silicon Dioxide (SiO₂)
sedimentary
Yellow Jasper
Silicon Dioxide (SiO2) with iron inclusions
sedimentary
Chert (also known as Flint or Common Chalcedony)
Cryptocrystalline Silica (SiO2)
sedimentary
Chert (Flint)
Chert (SiO2)
sedimentary
Moqui Marble (Concretion)
Iron Oxide Concretion (Hematite/Goethite)
sedimentary
Dinosaur Bone (Fossilized)
Permineralized Bone (CaCO3 or SiO2 after Hydroxylapatite)
sedimentary
Hematite
Iron(III) oxide (Fe2O3)
mineral
Clay Brick
Ceramic structural unit (Al2O3·2SiO2·2H2O as precursor)
metamorphic (man-made/anthropogenic)
Quartz (Milky or Smoky Quartz)
Silicon Dioxide (SiO2)
mineral
Brown Jasper
Silicon Dioxide (SiO2)
sedimentary
Chert (and Jasper/Flint variety)
Cryptocrystalline Quartz (SiO2)
sedimentary
Ferruginous Quartz (Iron-stained Quartz)
Silicon Dioxide with Iron Oxide (SiO2 with traces of Fe2O3/FeO(OH))
mineral
Quartz / Quartzite
Silicon Dioxide (SiO2)
Mineral / Metamorphic
Serpentinite
Serpentinite (composed primarily of Serpentine group minerals: (Mg,Fe)3Si2O5(OH)4)
metamorphic
Blue Quartzite
Blue Quartzite (Primary mineral: Quartz, SiO2 with magnesio-riebeckite or crocidolite inclusions)
metamorphic
Labradorite
Labradorite (Plagioclase Feldspar Series) - (Ca, Na)(Al, Si)4O8
mineral
Red Sandstone
Arenite (Ferruginous Sandstone)
sedimentary
Quartz with Mica/Host Rock
Silicon Dioxide (SiO2) with Phyllosilicates
mineral
Chert (Jasper variety)
Silicon Dioxide (SiO2)
sedimentary
Chert (Green Chert/Jasper)
Chert (primarily Microcrystalline Quartz, SiO2)
sedimentary
Sea Glass (Kelly Green)
Amorphous Silica (Silicon Dioxide with Iron/Chromium additives)
Anthropogenic specimen (Man-made material)
Orthoclase Feldspar
KAlSi3O8 (Potassium Aluminum Silicate)
mineral
Sandstone
Arenite (composed primarily of SiO2)
sedimentary
Banded Chert
Microcrystalline Quartz (SiO2)
sedimentary
Ferruginous Quartz
Silicon Dioxide (SiO2) with Hematite (Fe2O3) inclusions
mineral