Granitic Pegmatite
Granite Pegmatite (coarse-grained intrusive igneous rock)
igneous
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Basalt with Quartz Infill
Basalt (Mafic Extrusive Volcanic Rock)
igneous
Lake Superior Agate
Cryptocrystalline Quartz (SiO2)
mineral
Jasper (specifically Polychrome or Desert Jasper)
Silicon Dioxide (SiO2) with iron oxide and other mineral impurities
sedimentary (chemical/biological origin)
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Schist
Mica Schist
metamorphic
Granite Pegmatite
Phaneritic Plutonic Igneous Rock
igneous
Gneiss (with Quartz-Feldspar vein)
Gneiss (high-grade metamorphic rock) containing Quartz (SiO2) and Feldspar (KAlSi3O8 – NaAlSi3O8 – CaAl2Si2O8)
metamorphic
Quartz (Smoky/Druzy variety)
Silicon Dioxide (SiO2)
mineral
Snowflake Obsidian
Volcanic Glass with Spherulite Inclusions (primarily SiO2)
igneous
Rough Emerald in Matrix
Beryl (Be3Al2Si6O18) with trace Chromium/Vanadium
mineral
Quartz (likely Clear Quartz or Rock Crystal)
Quartz (SiO2)
Mineral
Magnetite
Magnetite (Fe3O4)
mineral
Amethyst
Silicon Dioxide (SiO2) with iron impurities
mineral
Amethyst
Amethyst (Silicon Dioxide, SiO2)
mineral
Kunzite (Spodumene)
Spodumene (LiAlSi2O6)
mineral
Ferruginous Sandstone
Arenite with Iron-oxide cement (composed of Quartz and Limonite/Hematite)
sedimentary
Quartz (Iron-Stained)
Silicon Dioxide (SiO2)
mineral
Quartz with Oxides
Silicon Dioxide (SiO2)
mineral
Copper-bearing Quartz (likely Chrysocolla or Malachite staining)
Cuprite, Chrysocolla (Cu2-xAlx(H2-xSi2O5)(OH)4·nH2O) or Malachite staining on Quartz/Host Rock
mineral
Petrified Wood
Silicified Wood (SiO2)
mineral
Quartz (Iron-stained)
Silicon Dioxide (SiO2)
mineral
Amethyst
Silicon Dioxide (SiO2) with iron impurities
mineral
Quartz / Common Opal
Silicon Dioxide (SiO2)
mineral
Amethyst Geodes
Silicon Dioxide (Quartz with Iron impurities), SiO2
mineral
Chalcedony
Cryptocrystalline Quartz (SiO2)
mineral
White Quartz (Tumbled)
Silicon Dioxide (SiO2)
mineral
Banded Agate
Agate (Microcrystalline Chalcedony/Quartz, SiO2)
mineral
Diamond (Cut Specimen)
Diamond (pure carbon, C)
mineral
Amethyst (Geode/Cluster)
Silicon Dioxide (SiO2) with iron impurities
mineral
Smoky Quartz with Chert
Silicon Dioxide (SiO2)
mineral
Dyed Agate
Silicon Dioxide (SiO2)
mineral
Blue Agate Geode (Dyed)
Cryptocrystalline Quartz (SiO2)
mineral
Milky Quartz
Quartz (Silicon Dioxide, SiO2)
mineral
Quartz (Milky/Yellowish variety)
Silicon Dioxide (SiO2)
mineral
Amethyst (Geode/Druzy)
Silicon Dioxide (SiO2) with iron impurities
mineral
Green Aventurine
Silicon dioxide (SiO2) with fuchsite inclusions
mineral
Sandstone (Quartzose Sandstone)
Clastic sedimentary rock (SiO2 dominated)
sedimentary
Yellow Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Sandstone
Arenite (primarily SiO2)
sedimentary
Red Sandstone
Arenite (with Iron Oxide / Hematite cementation)
sedimentary
Amygdaloidal Basalt
Basalt with secondary mineral infilling (commonly SiO2 or Zeolites)
igneous