Milky Quartz
Quartz (Silicon Dioxide, SiO2)
mineral
Category
Not A Geological Specimen
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Quartzite
Quartzite (SiO2)
metamorphic
Milky Quartz Pebble
Silicon dioxide (SiO2)
mineral
Chert (and Limestone) River Cobble
Microcrystalline Quartz (SiO2) within Calcium Carbonate (CaCO3)
sedimentary
Quartz (small fragment)
Silicon Dioxide (SiO2)
mineral
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Pyrite (on Quartz matrix)
Iron Disulfide (FeS2)
mineral
Pyrite (Fool's Gold)
Iron Disulfide (FeS2)
mineral
Gold Ore in Quartz
Auriferous Quartz (SiO2 with Au inclusions)
mineral
Quartz Vein in Host Rock (often Granite or Schist)
Silicon Dioxide (SiO2) within host matrix
mineral with metamorphic or igneous host
Jasper-bearing Quartzite River Cobble
Tectonized Quartzite with Iron-Oxide (Hematite/Limonite) Veining
metamorphic
Amethyst
Silicon Dioxide with Iron impurities (SiO2)
mineral
Dendritic Jasper
Silicon Dioxide (SiO2) with Manganese/Iron oxide inclusions
sedimentary
Milky Quartz
Silicon Dioxide (SiO2)
Mineral
Clear Quartz
Silicon Dioxide (SiO2) / Rock Crystal
mineral
Ironstone Concretion / Limonite Specimen
Goethite and Limonite (Hydrous Iron Oxides)
sedimentary
Chert (Iron-stained)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Granite (Pink/Red variety)
Phaneritic Felsic Intrusive Igneous Rock (composed primarily of Quartz, K-Feldspar, and Plagioclase)
igneous
Pyrite (Fool's Gold)
Iron Sulfide (FeS2)
mineral
Fluorite-Gedrite in Quartz (Schist)
Fluorite (CaF2) with Gedrite in Quartz/Feldspar Matrix
metamorphic
Quartz Vein on Matrix
Silicon Dioxide (SiO2)
mineral
Aragonite Star Cluster
Aragonite (Calcium Carbonate, CaCO3)
mineral
Yellow Chalcedony
Silicon Dioxide (SiO2)
mineral
Honey Calcite
Calcium Carbonate (CaCO3)
mineral
Milky Quartz (Water-worn Pebble)
Quartz (Silicon Dioxide, SiO2)
mineral
Pyrite (Fool's Gold)
Iron Sulfide (FeS2)
mineral
Pyrite
Iron Sulfide (FeS2)
mineral
Quartz (specifically Clear Quartz or Rock Crystal)
Silicon Dioxide (SiO2)
mineral
Gold (in Opaque Matrix/Jewelry)
Native Gold (Au)
mineral
Botryoidal Agate
Chalcedony (Silicon Dioxide, SiO2)
mineral
Ferruginous Quartz
Silicon Dioxide (SiO2) with Limonite/Hematite inclusions
Mineral
Pyrite (Fool's Gold)
Iron Disulfide (FeS2)
mineral
Basalt (Arrowhead form)
Extrusive mafic igneous rock
igneous
Quartz (Crystal Cluster)
Silicon Dioxide (SiO2)
mineral
Chert (Jasper variety)
Silicon Dioxide (SiO2)
sedimentary
Clear Quartz (Rock Crystal)
Silicon Dioxide (SiO2)
mineral
River Pebble (Brecciated Chert/Siltstone)
Silicon Dioxide (SiO2) with mineral inclusions
sedimentary
Yellow Calcite
Calcium Carbonate (CaCO3)
mineral
Clear Quartz Cluster
Silicon Dioxide (SiO2)
mineral
Quartz (Iron-stained)
Silicon Dioxide (SiO2)
mineral
Amethyst
Silicon Dioxide (SiO2)
mineral
Granite
Phaneritic plutonic rock (approx. 20-60% quartz, 35-90% feldspar)
igneous