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.
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Botryoidal Chalcedony (Agate)
Cryptocrystalline Quartz (SiO2)
mineral
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
Green Druzy Quartz (Prasiolite)
Silicon Dioxide (SiO2) with inclusions (typically Chlorite or Actinolite)
mineral
Granitic Pegmatite
Coarse-grained Granite (KAlSi3O8 + SiO2)
igneous
Chert (specifically Flint or Jasper variant)
Microcrystalline Quartz (SiO2)
sedimentary
Jadeite Jade
NaAlSi2O6 (Sodium Aluminum Silicate)
metamorphic
Selenite
Gypsum (CaSO4·2H2O), specifically the crystalline variety Selenite
Mineral
Tree Agate
Chalcedony with Dendritic Chlorite (SiO2 with impurities)
sedimentary/mineral
Chert (specifically Flint)
Chert (Microcrystalline or Cryptocrystalline Quartz, SiO2)
sedimentary
Puddingstone
Conglomerate (specifically a type of jasper conglomerate or quartz conglomerate)
Sedimentary
Amber
Succinite (Fossilized Tree Resin)
mineral
Desert Rose
Gypsum (variety Selenite) - CaSO4·2H2O
mineral
Crazy Lace Agate
Agate (Chalcedony), SiO2
Mineral
Milky Quartz Pebble
Quartz (Silicon Dioxide - SiO2)
mineral
Transit Token (RTD Denver)
Nickel-plated brass or bronze alloy (Cu-Sn-Zn-Ni)
not a rock or mineral (anthropogenic material)
Moss Agate
Silicon Dioxide with inclusions (SiO2 + impurities)
mineral
Moss Agate
Chalcedony (SiO2) with dendritic inclusions of Manganese or Iron oxide
mineral
Blue Goldstone
Aventurine Glass (SiO2 with Co and metallic inclusions)
mineral (synthetic glass)
Yooperlite (Fluorescent Sodalite-bearing Syenite)
Syenite rich in sodalite
igneous
Chert (specifically Banded Chert or Flint)
Microcrystalline Quartz (SiO2)
sedimentary
Zebra Jasper
Silicon Dioxide (SiO2) with impurities; typically a form of Chalcedony/Microcrystalline Quartz
sedimentary
Unakite
Epidotized Granite
Igneous rock
Seraphinite
Clinochlore (a variety of the chlorite group)
mineral
Chert (specifically Flint or Jasperoid)
Silicon Dioxide (SiO2)
sedimentary
Jasper (specifically Red Jasper)
Silicon Dioxide (SiO2) with iron oxide inclusions
sedimentary
Gneiss (specifically Granitic Gneiss)
Gneiss (composed primarily of Quartz, Feldspar, and Biotite/Amphibole)
metamorphic
Jasper (Green Jasper/Chert)
Silicon Dioxide (SiO2)
sedimentary
River Cobble (Basaltic/Andesitic)
Mafic Igneous Porphyritic Rock
igneous
White Quartz (Milky Quartz)
Silicon Dioxide (SiO2)
mineral
Mahogany Obsidian
Volcanic Glass (predominantly SiO2 with inclusions of Hematite or Magnetite)
igneous
Gold Sheen Obsidian
Obsidian (volcanic glass with SiO2 + gas inclusions)
igneous
Tiger's Eye (specifically Hawk's Eye or Multicolored Tiger's Iron)
Silicon Dioxide with Crocidolite inclusions (SiO2)
mineral
Granite Gneiss
Gneiss (High-grade Metamorphic Rock)
metamorphic
Banded Agate (specifically Sardonyx)
Silicon Dioxide (SiO2) - variety of Chalcedony/Quartz
mineral
Sandstone (specifically Lithic or Quartz Arenite)
Arenite (composed primarily of SiO2)
sedimentary
Banded Gneiss
Gneiss (High-grade metamorphic rock typically composed of Quartz, Feldspar, and Mica)
metamorphic
Chalcedony (specifically Agate or Flint)
Silicon Dioxide (SiO₂)
Mineral
Agate (specifically Chalcedony nodule)
Silicon Dioxide (SiO2)
mineral
Quartz (specifically Clear Quartz or Rock Crystal)
Silicon Dioxide (SiO2)
mineral
Quartz Crystal (specifically Rock Crystal)
Silicon Dioxide (SiO2)
mineral