Milky Quartz with Iron Staining
Silicon Dioxide (SiO2)
mineral
Category
Mineral (Specifically A Mineraloid)
Browse mineral (specifically a mineraloid) specimens identified by the Rock Identifier community.
Seraphinite
Clinochlore (a variety of the chlorite group)
mineral
Banded Gneiss
Gneiss (High-grade metamorphic rock typically composed of Quartz, Feldspar, and Mica)
metamorphic
Banded Agate (specifically Carnelian Agate color)
Silicon Dioxide (SiO2) - variety of Chalcedony
mineral
Gneiss (specifically Banded Gneiss)
Gneiss
metamorphic
Zebra Jasper
Silicon Dioxide (SiO2) with impurities; typically a form of Chalcedony/Microcrystalline Quartz
sedimentary
Transit Token (RTD Denver)
Nickel-plated brass or bronze alloy (Cu-Sn-Zn-Ni)
not a rock or mineral (anthropogenic material)
Limestone (specifically Travertine or Tufa)
Calcium Carbonate (CaCO3)
sedimentary
Opalite
Synthetic Glass, SiO2 base with metallic inclusions
mineraloid (synthetic)
Jasper (specifically Brecciated or Agated Jasper)
Silicon Dioxide (SiO2) - Chalcedony with impurities
Mineral / Sedimentary
Jasper (specifically Bloodstone or Heliotrope variety)
Silicon Dioxide (SiO2) with iron oxide inclusions
Sedimentary / Mineral
Blue Goldstone
Aventurine Glass (SiO2 with Co and metallic inclusions)
mineral (synthetic glass)
Selenite
Gypsum (CaSO4·2H2O), specifically the crystalline variety Selenite
Mineral
Milky Quartz Pebble
Quartz (Silicon Dioxide - SiO2)
mineral
Desert Rose
Gypsum (variety Selenite) - CaSO4·2H2O
mineral
Chert (specifically Flint)
Chert (Microcrystalline or Cryptocrystalline Quartz, SiO2)
sedimentary
Gneiss (specifically a Granitic Gneiss)
Gneiss (typically composed of Quartz, Feldspar, and Mica/Amphiboles)
metamorphic
Gneiss (specifically a Granitic Gneiss)
Gneiss (Composition: Quartz, Feldspar, Mica)
metamorphic
Quartzite (Milky Quartz Cobble)
Silicon Dioxide (SiO2)
Metamorphic
Libyan Desert Glass
Tektite (high-silica impact glass), SiO2 + tracing minerals
mineraloid / impactite
Jasper (Green Jasper/Chert)
Silicon Dioxide (SiO2)
sedimentary
Banded Calcite or Travertine
Calcium Carbonate (CaCO3)
Sedimentary
Yellow Aventurine (specifically a carved crescent moon)
Silicon Dioxide (SiO2) with inclusions
mineral
River Cobble (Basaltic/Andesitic)
Mafic Igneous Porphyritic Rock
igneous
Mahogany Obsidian
Volcanic Glass (predominantly SiO2 with inclusions of Hematite or Magnetite)
igneous
Gold Sheen Obsidian
Obsidian (volcanic glass with SiO2 + gas inclusions)
igneous
Chert (specifically Flint or Jasper variant)
Microcrystalline Quartz (SiO2)
sedimentary
White Quartz (Milky Quartz)
Silicon Dioxide (SiO2)
mineral
Green Calcite
Calcium Carbonate (CaCO3)
mineral
Ocean Jasper (Orbicular Jasper)
Silicon Dioxide (SiO2)
Sedimentary Rock
Rose Quartz
Silicon Dioxide (SiO2) with trace amounts of titanium, iron, or manganese
mineral
Banded Gneiss (River Rock/Pebble)
Gneiss (specifically a banded variety often found as a river rock)
Metamorphic Rock
Gneiss (specifically Granitic Gneiss)
Gneiss (composed primarily of Quartz, Feldspar, and Biotite/Amphibole)
metamorphic
Amber
Succinite (Resinite)
mineraloid
Obsidian
Volcanic Glass (SiO2)
igneous
Obsidian with Mahogany Phasing
Volcanic Glass (SiO2 + Fe2O3)
igneous
Puddingstone
Conglomerate (specifically a type of jasper conglomerate or quartz conglomerate)
Sedimentary
Obsidian
Obsidian (Volcanic Glass), primarily SiO2
igneous
Banded Agate (Onyx type)
Silicon Dioxide (SiO2) - Cryptocrystalline Quartz
mineral
Chert (specifically a nodule with Chalcendony/Agate banding)
Microcrystalline Quartz (SiO2)
sedimentary
Quartzite (specifically a river-worn pebble)
Quartzite (primarily SiO2)
metamorphic
Pumice (specifically a water-worn, weathered variety)
Vesicular volcanic glass
igneous