Milky quartz (massive quartz)
Quartz, silicon dioxide (SiO₂)
mineral
Category
Man Made Material (Simulated Mineral)
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Weathered, quartz-rich metamorphic rock (likely schist or gneiss)
Quartz–feldspar–mica schist/gneiss, with surface lichens and iron-oxide staining
metamorphic
Petrified Wood
Silicified wood (primarily quartz, SiO2)
fossil
Fossil Shark Tooth
Carcharadon sp. (likely Carcharodon carcharias or similar Lamniformes)
fossil
Quartz (Milky or Iron-Stained)
Silicon Dioxide (SiO2)
mineral
Quartz pebble
Silicon dioxide (SiO2)
mineral
Milky Quartz with Iron Staining
Quartz (SiO2)
mineral
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Golden Quartz
Silicon Dioxide (SiO2)
mineral
Prasiolite (Green Quartz) / Sea Glass Amalgam
SiO2 (Silicon Dioxide)
mineral
Sunstone
(Ca,Na)(Al,Si)4O8 (Oligoclase or Andesine)
mineral
Amazonite
Microcline (KAlSi3O8) with trace lead (Pb)
mineral
Muscovite Mica
Muscovite (Potassium Aluminum Silicate Hydroxide), KAl2(AlSi3O10)(OH)2
mineral
Diamond (Cut Gemstone)
Carbon (C)
mineral
Likely weathered quartz-bearing rock fragment
Indeterminate; appears to contain quartz (SiO₂) with iron-oxide staining, possibly from quartzite, granite, or pegmatite
mineral
Mahogany Obsidian
Obsidian with Hematite inclusions (SiO2 + Fe2O3)
igneous
Tumbled brown jasper (likely iron-rich chalcedony)
Jasper, opaque microcrystalline quartz (SiO₂), commonly colored by iron oxides
mineral
Milky quartz (rough quartz crystal)
Quartz, silicon dioxide (SiO₂)
mineral
Quartz
Silicon Dioxide (SiO2)
mineral
Quartz (Chert/Quartzite)
Silicon Dioxide (SiO2)
mineral
Quartz Crystal Cluster
Quartz (Silicon Dioxide, SiO2)
mineral
Quartz (Milky/Clear variety)
Silicon Dioxide (SiO2)
mineral
Quartz–feldspar pegmatite specimen
Granitic pegmatite, chiefly quartz (SiO₂), potassium feldspar (KAlSi₃O₈), and mica-group minerals
igneous
Petrified Wood
Silicified Wood (SiO2)
fossil
Copper ore with native copper and quartz/calcite
Malachite–chrysocolla–cuprite-bearing copper ore, likely with quartz or calcite gangue
mineral
Likely quartz-bearing mineral aggregate
Quartz (SiO₂), possibly mixed with mica or feldspar
mineral
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Diamond
Diamond (C)
Mineral
Sandstone
Arenite
sedimentary
Mammoth or Mastodon Tooth Fossil
Proboscidea tooth (Mammuthus or Mammut)
fossil
Tumbled chalcedony or carnelian
Microcrystalline quartz (SiO₂), likely iron-bearing chalcedony
mineral
Fossilized coral or porous marine limestone
Likely fossil coral (Scleractinia), composed mainly of calcite/aragonite (CaCO₃)
fossil
Amethyst cluster
Quartz, silicon dioxide (SiO₂), purple variety colored mainly by iron impurities and irradiation
gemstone
Sandstone (Ferruginous)
Arenite with Iron Oxides
sedimentary
Kaolinite (Chalky Clay)
Kaolinite (Al2Si2O5(OH)4)
sedimentary
Petrified Wood
Silicified Wood (SiO2)
fossil
Fossilized Shark Tooth
Chondrichthyes tooth
fossil
Tumbled red jasper
Jasper, an opaque microcrystalline variety of quartz (SiO₂), colored mainly by iron oxides
mineral
Weathered banded sandstone pebble
Quartz-rich sandstone (predominantly SiO₂)
sedimentary
Quartz Pebble
Silicon dioxide (SiO2)
sedimentary
Fossilized oyster shell in limestone
Bivalvia fossil; chiefly calcite (CaCO₃)
fossil
Tumbled ocean jasper or orbicular jasper
Microcrystalline quartz (SiO₂), commonly with chalcedony, feldspar, and iron-oxide inclusions
mineral