Quartz Vein in Host Rock
Silicon Dioxide (SiO2) in matrix
mineral
Category
Mineral Like Biological Tissue
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Granite Pebble (Salt and Pepper Granite)
Phaneritic Felsic Igneous Rock (primarily Quartz, Feldspar, and Biotite/Amphibole)
igneous
Sandstone
Clastic sedimentary rock
sedimentary
Quartz (Smoky/Milky variety)
Silicon Dioxide (SiO2)
mineral
Yellow Jasper
Silicon Dioxide (SiO2) with hydrated iron oxide impurities
sedimentary
Fossilized Shark Tooth
Fossilised Chondrichthyes dental specimen (likely Otodus or Carcharias sp.)
mineral
Luminous Stone (Glow-in-the-dark Synthetic/Man-made Stone)
Strontium Aluminate tinted glass or resin (Crystalline silicate/oxide mix)
mineral (synthetic)
Sandstone
Clastic Sedimentary Rock
sedimentary
Granite
Phaneritic Igneous Rock (primarily Quartz, Feldspar, and Mica)
igneous
Anthracite Coal
Anthracite (Carbon-rich metamorphic coal)
metamorphic
Clear Quartz (Rock Crystal)
Silicon Dioxide (SiO2)
mineral
Petrified Wood
Silicified Wood (SiO2)
fossil
Amethyst
Silicon Dioxide (SiO2) with iron impurities
mineral
Granite (Alkali-feldspar Granite)
Felsic Plutonic Rock (Primary minerals: Quartz SiO2, Orthoclase KAlSi3O8, Plagioclase (Na,Ca)AlSi3O8)
igneous
Ferruginous Quartz
Silicon Dioxide (SiO2) with Iron Oxide (Limonite/Hematite)
mineral
Chalcedony (Common Opal variant)
Silicon dioxide (SiO2) with varying levels of hydration
mineral
Schist
Schist
Metamorphic
Green Schist
Greenschist (Chlorite Schist)
metamorphic
Tiger's Eye
Pseudomorph of Quartz after Crocidolite (SiO2)
mineral
Rose Quartz
Silicon Dioxide (SiO2)
mineral
Petrified Wood
Silicified Wood (primarily Quartz/Chalcedony replacing $SiO_2$)
sedimentary
Pink Sapphire (Corundum)
Aluminum Oxide (Al2O3) with Chromium/Iron impurities
gemstone
Gneiss
Gneiss (High-grade metamorphic rock)
metamorphic
Granatic Pegmatite
Pegmatitic Granite
igneous
Granitic Pegmatite
Pegmatite containing Quartz, Pink Potassium Feldspar, and Muscovite Mica
igneous
Granite
Granite
Igneous
Diorite with Xenolith
Phaneritic Intermediate Plutonic Rock
igneous
Diorite (River Pebble)
Intermediate Phaneritic Igneous Rock
igneous
Schist (with Iron Oxide)
Mica Schist
metamorphic
Dendritic Opal
Hydrated Silica with Manganese inclusions (SiO2·nH2O)
mineral
Obsidian
Obsidian (Volcanic Glass, SiO2 + impurities)
igneous
Weathered Gabbro or Diorite (Igneous Cobble)
Phaneritic Basic/Intermediate Igneous Rock
igneous
Eudialyte
Na15Ca6Fe3Zr3Si26O72(OH,Cl)2 (Eudialyte Group)
mineral
Greenstone / Quartzite Pebble
Metamorphosed Quartz-rich Rock
metamorphic
Dendritic Agate
Silicon Dioxide (SiO2) with Manganese/Iron oxide inclusions
mineral
Diorite
Intermediate Phaneritic Igneous Rock
igneous
Mahogany Obsidian
Volcanic Glass (SiO2 + Fe2O3)
igneous
Petrified Wood
Silicified Wood (SiO2)
fossil
Sandstone
Sedimentary Rock (Quartz Sandstone)
sedimentary
Sandstone
Arenite (SiO2 primarily)
sedimentary
Amygdaloidal Basalt
Extrusive Igneous Rock with Amygdules
igneous
Biotite Schist
Biotite-rich Schist (K(Mg,Fe)3AlSi3O10(OH,F)2)
metamorphic