Milky and Ferruginous Quartz
Silicon Dioxide (SiO2)
mineral
Category
Mineral (Silicate Replaced Organic Material)
Browse mineral (silicate replaced organic material) specimens identified by the Rock Identifier community.
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Milky Quartz
Silicon Dioxide (SiO2)
mineral
Milky Quartz
Silicon Dioxide (SiO2)
mineral
White Quartz Cobble
Quartz (Silicon Dioxide, SiO2)
mineral
Stichtite in Serpentine (Atlantasite)
Mg6Cr2CO3(OH)16·4H2O in Mg3Si2O5(OH)4
metamorphic
Silicon Carbide (Carborundum)
Moissanite (SiC)
mineral
Milky Quartz
Quartz (Silicon Dioxide, SiO2)
mineral
Sandstone (Ferruginous)
Arenite with Iron-Oxide Cement
sedimentary
Septarian Nodule or Mud Crack Fossil
Septarian Nodule (Concretion)
sedimentary
Shale with Pyrite
Clastic sedimentary rock containing Iron Disulfide (FeS2)
sedimentary
Chert (specifically Banded Chert)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Pearl
Aragonite / Calcium Carbonate (CaCO3)
mineral
Pyrite Geode (Sparkling Druzy)
Iron Sulfide (FeS2) in Sedimentary Nodule
mineral
Pearl
Biogenic Calcium Carbonate (Aragonite/Calcite), CaCO3
mineral
Opalite (a synthetic glass, often confused with Opal)
Silicon dioxide glass (SiO2nH2O, for natural opal)
Synthetic (glass)
Quartz Pebble (possibly Chalcedony or Chert)
Silicon Dioxide (SiO2)
mineral
Quartz vein in Schist
Crystalline Silicon Dioxide (SiO2) in Metamorphic Host
metamorphic
Chert (Iron-stained)
Microcrystalline silica (SiO2) with trace Iron oxide (Fe2O3)
sedimentary
Red Chert (Jasper)
Silicon Dioxide (SiO2)
sedimentary
Concretion
Septarian Concretion (Fragmentary)
sedimentary
Sandstone
Arenite (composed primarily of SiO2)
sedimentary
Sandstone (Ferruginous)
Arenite with Iron Oxides
sedimentary
Sandstone (likely Graywacke or Arkose variant)
Clastic Sedimentary Rock (SiO2 based)
sedimentary
Sandstone
Arenite (primarily SiO2)
sedimentary
Carborundum (Silicon Carbide)
Silicon Carbide (SiC)
mineral
Sandstone
Arenite (primarily SiO2)
sedimentary
Banded Calcite (often sold as 'Travertine' or 'Mexican Onyx')
Calcium Carbonate (CaCO3)
sedimentary
Fuchsite (Green Muscovite in Quartz)
K(Al,Cr)2(AlSi3O10)(OH)2 - Chromium-rich Muscovite
metamorphic
Quartz with inclusions
Silicon Dioxide (SiO2)
mineral
Chert (Flint)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Fossilized Brachiopod
Phylum Brachiopoda (likely Order Spiriferida or Orthida)
fossil
Obsidian
Volcanic Glass (SiO2)
igneous
Slate
Slate (foliated metamorphic rock)
metamorphic
Greenstone
Metabasalt / Greenschist facies rock
metamorphic
Tiger Iron
Tiger Iron (composite of Tiger's Eye, Red Jasper, and Hematite)
metamorphic
Fuchsite
Chromium-rich Muscovite (KAl2(AlSi3O10)(OH,F)2 with Cr replacements)
mineral
Sandstone
Arenite (typically SiO2 + others)
sedimentary
Chert (Chalcedony/Agate)
Microcrystalline Quartz (SiO2)
sedimentary
Zebra Jasper
Tetragonal Silicon Dioxide (Quartz) with impurities
sedimentary
Shale
Shale (comprised mostly of clay minerals and quartz)
sedimentary
Sandstone
Sandstone (clastic sedimentary rock, predominantly SiO2)
sedimentary
Sandstone
Arenite (SiO2 based)
sedimentary