Milky Quartz
Silicon Dioxide (SiO2)
mineral
Category
Not A Geological Specimen
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Amber
Succinite
mineraloid
Moonstone
Adularia (orthoclase) or Albite (plagioclase), a potassium aluminum silicate of the feldspar group
Mineral
Quartz River Cobble
Silicon Dioxide (SiO2)
Mineral (Primary constituent)
Quartz Vein in Host Rock
Silicon Dioxide (SiO2)
mineral with metamorphic or sedimentary host
Mica Schist (with Muscovite)
Muscovite/Quartz Schist (KAl2(AlSi3O10)(OH)2)
metamorphic
Amber
Fossilized Tree Resin (C10H16O)
mineral
Limestone Cobble
Carbonate Rock (CaCO3)
sedimentary
Banded Agate (Carnelian type)
Agate (Cryptocrystalline Quartz, SiO2)
mineral
Quartz Geode
Silicon Dioxide (SiO2) - Crystalline Quartz
mineral
Septarian Nodule
Septarian Concretion (CaCO3-rich mudstone with Calcite/Aragonite veins)
sedimentary
Porphyritic Andesite
Andesite (porphyritic variety)
igneous
Chert / Flint Nodule
Silicon Dioxide (SiO2)
sedimentary
Ocean Jasper
Spherulitic Chalcedony (SiO2)
mineral
Amber
Succinite (fossilized resin)
mineral
Chalcedony
Chalcedony (SiO₂)
Mineral
Super Seven (Melody Stone)
Quartz with inclusions (Amethyst, Cacoxenite, Goethite, Lepidocrosite, Rutile, Smoky Quartz, and Clear Quartz)
mineral
Granite (weathered)
Felsic Intrusive Igneous Rock (composed of Quartz, Alkali Feldspar, and Plagioclase)
igneous
Black Tourmaline in Quartz Matrix
Schorl (NaFe3Al6(BO3)3Si6O18(OH)4) with Quartz (SiO2)
mineral
River Pebble (Siltstone/Mudstone)
Clastic sedimentary rock
sedimentary
Quartzite
Quartzite (primarily SiO2)
metamorphic
Quartzite River Rock
Metamorphic Quartzite (primarily SiO2)
metamorphic
Chert (specifically Jasper/Agate variety)
Microcrystalline Quartz (SiO2)
sedimentary
Amber
Succinite (a Fossilized Tree Resin); Chemical formula is approximately C10H16O
Organic mineraloid
Sandstone (likely Fossiliferous)
Arenite / Fossiliferous Sandstone (SiO2 composition)
sedimentary
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Milky Quartz with Iron Staining
Silicon Dioxide (SiO2)
mineral
Amethyst Quartz (Chevron Amethyst)
Silicon Dioxide (SiO2) with iron impurities
mineral
Pink Granite
Phaneritic Felsic Igneous Rock (composed primarily of K-Feldspar, Quartz, and Plagioclase)
igneous
Calcite on Limestone (or Fossil)
Calcium Carbonate (CaCO3)
sedimentary
Chert (Agatized Chert)
Microcrystalline Quartz (SiO2)
sedimentary
Quartzite (River Pebble)
Meta-quartzite (composed primarily of SiO2)
metamorphic
River Stone / Siltstone
Siltstone (composed of lithified silt)
sedimentary
Petrified Wood
Silicified Wood (primarily SiO2 - Silicon Dioxide)
sedimentary
Sandstone (lithic/greywacke variant)
Clastic sedimentary rock (primarily SiO2 with rock fragments)
sedimentary
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Yellow Chalcedony (Agate or Citrine Quartz)
Silicon Dioxide (SiO2)
mineral
Jasper in Quartz (River Cobble)
Silicon Dioxide (SiO2) with Ferric Iron inclusions
sedimentary
Quartz (Agate/Chalcedony variety)
Silicon Dioxide (SiO2)
mineral
Chert
Channery Chert (Microcrystalline Quartz)
sedimentary
Jasper with Hematite
Silicon Dioxide (SiO2) with Ferric Oxide (Fe2O3)
sedimentary
Kyanite in Quartz
Al2SiO5 in SiO2
metamorphic