Quartzite
Quartzite (primarily SiO2)
metamorphic
Category
Sedimentary (Chemical)
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Quartzite
Quartzite
metamorphic
Fluorite
Calcium Fluoride (CaF2)
mineral
Amethyst Cluster
Amethyst (Silicon Dioxide), chemical formula: SiO2
mineral
Diamond
Diamond (carbon allotrope), C (chemical formula)
Mineral
Agate (specifically, likely a geode slice or nodule)
Agate (a variety of Chalcedony, with chemical formula SiO2)
Mineral
Dyed Agate
Silicon Dioxide (SiO2) - Variety Agate / Chalcedony
mineral
Concrete / Anthropogenic Conglomerate
Man-made composite material (Portland cement, aggregate, and water)
not a natural rock
Amber
Succinite (organic mineraloid); Chemical formula: C10H16O
mineral
Pink Banded Agate (Dyed)
Chalcedony (cryptocrystalline silica), chemical formula SiO2
mineral
Chinese Writing Stone
Porphyritic Basalt (with Andalusite/Feldspar phenocrysts)
igneous
Quartzite Pebble
Metamorphosed Quartz Sandstone (SiO2)
metamorphic
Grey Agate
Silicon Dioxide (SiO2) - variety: Agate/Chalcedony
mineral
Agate (specifically Botswana or Lake Superior style chalcedony)
Silicon Dioxide (SiO2)
mineral
Calcite
Calcite (CaCO 3)
Mineral
Milky Quartz (Water-Worn Cobble)
Silicon Dioxide (SiO2)
mineral
Quartzite Cobble
Metamorphosed Quartz Sandstone (SiO2)
metamorphic
Basalt with Weathering Crust
Aphanitic Mafic Igneous Rock
igneous
Acrylic or Resin (Synthetic Imitation)
Polymethyl Methacrylate (PMMA) or Polyepoxide
Synthetic/Man-made Polymer
Nephrite Jade
Nephrite (Ca2(Mg, Fe)5Si8O22(OH)2)
metamorphic
Specular Hematite and Magnetite Ore
Iron Oxide (Fe2O3 and Fe3O4)
mineral
Sea Glass (Teal/Turquoise)
Amorphous Silica (SiO2) with trace metal oxides
Anthropogenic (Man-made material processed by nature)
Dyed Howlite (often sold as 'Turquenite')
Calcium Borosilicate Hydroxide (Ca2B5SiO9(OH)5)
mineral
Purple Agate (Dyed Chalcedony)
SiO2 (Silicon Dioxide) with organic dyes
mineral
Chert or Flint (polished/water-worn)
Chert (a microcrystalline or cryptocrystalline variety of quartz, SiO2). Flint is a specific variety of chert.
Sedimentary (most likely, as Chert is a sedimentary rock often found as nodules in limestone or as bedded deposits; however, it can also form by metasomatic replacement, which leans towards metamorphic processes under certain conditions)
Tiger's Eye
Pseudomorph of Quartz after Crocidolite (SiO2)
gemstone
Quartz Pebble
Crystalline Silica (SiO2)
mineral
Cloudy Quartz with Mica inclusions
Silicon Dioxide (SiO2) with accessory Muscovite KAl2(AlSi3O10)(OH)2
mineral
Quartzite (Orthoquartzite)
Quartzite (SiO2)
metamorphic
Quartz (Milky/Tan)
Silicon Dioxide (SiO2)
mineral
Agate (Carnelian/Chalcedony)
Silicon Dioxide (SiO2)
mineral
Quartzite
Quartzite (primarily SiO2)
metamorphic
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Citrine (Yellow Quartz)
Silicon Dioxide (SiO2)
Mineral
Quartz (Gravel Pebble)
Silicon Dioxide (SiO2)
mineral
Quartz (Tumbled)
Silicon Dioxide (SiO2)
mineral
Titanium Aura Quartz
Titanium-coated Silicon Dioxide (SiO2)
mineral (man-enhanced)
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Granite Cobble
Phaneritic Felsic Igneous Rock
igneous
Granite
Granitoid
igneous
Diamond (or high-refractive faceted gemstone)
Carbon; C
mineral
Ferruginous Quartz
Silicon Dioxide (SiO2) with Iron Oxide inclusions
mineral side of metamorphic/igneous sources