Chert (Nodule)
Silicon Dioxide (SiO2) - Cryptocrystalline Quartz
sedimentary
Category
Mineral Based Human Made Alloy
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Sandstone (likely Quartzose Sandstone)
Arenite (SiO2 based)
sedimentary
Chert (Flint variety)
Chert (Microcrystalline or Cryptocrystalline Quartz), SiO2
sedimentary
Iron Slag
Iron/Steel Slag (Ferrosilicate Glass)
industrial byproduct (anthropogenic material)
Chert (varieties include Flint and Mudstone)
Microcrystalline Silica (SiO2)
sedimentary
Chert (Flint)
Silicon Dioxide (SiO2)
sedimentary
Beryl (Emerald Variety)
Beryllium aluminum silicate (Be3Al2(SiO3)6) with chromium/vanadium traces
mineral
Aquamarine
Beryl (Be3Al2Si6O18 with iron traces)
mineral
Slag Glass
Anthropogenic Amorphous Silicon Dioxide
mineral
Gold Grain
Native Gold (Au)
mineral
Sandstone
Arenite (SiO2 based with mineral cements)
sedimentary
Coquina
Bioclastic Limestone
sedimentary
Sandstone
Arenite (SiO2 based with mineral cement)
sedimentary
Pink Granite
Phaneritic Felsic Intrusive Igneous Rock
igneous
Man-made Slag (Industrial Byproduct)
Anthropogenic Glassy Residue
not a natural rock
Sandstone
Arenite (SiO2 based with mineral cement)
sedimentary
Muscovite Mica in Quartz
Potassium Aluminum Silicate Hydroxide (KAl2(AlSi3O10)(OH)2) and Silicon Dioxide (SiO2)
metamorphic
Black Spinel
Magnesium Aluminum Oxide (MgAl2O4)
mineral
Aura Amethyst (Dyed/Coated)
Titanium-treated Silicon Dioxide (SiO2)
mineral
Rough Apatite in Matrix
Fluorapatite / Chlorapatite / Hydroxylapatite (Ca5(PO4)3(F,Cl,OH))
mineral
Granite (Leucogranite)
Felsic Plutonic Rock (Granite)
igneous
Chert (Jasper/Flint variety)
Microcrystalline Quartz (SiO2)
sedimentary
Tree Agate
Silicon Dioxide (SiO2) with Dendritic Inclusions
Mineral
Fossil / Permineralized Bone
Tyrannosaurus rex fossil (Hydroxylapatite replaced by various minerals)
sedimentary
Green Moss Agate
Agate (Silicon Dioxide, SiO2) with inclusions
mineral
Aura Quartz Geode (Angel Aura Quartz)
Silicon Dioxide (SiO2) bonded with precious metals
mineral
Sandstone (Siltstone or Fine-grained)
Clastic sedimentary rock (primarily SiO2)
sedimentary
Chert (or Flint)
Chert (a cryptocrystalline variety of quartz, SiO2)
sedimentary
Diorite
Diorite
igneous
Quartzite (Aventurine type)
Metamorphosed Quartz Sandstone (SiO2 with inclusions)
metamorphic
Native Copper (Tumbled Nugget)
Cu (Native Element)
mineral
Beryl (var. Aquamarine/Blue Beryl) in Quartz Matrix
Beryllium Aluminum Silicate (Be3Al2Si6O18)
mineral
Aquamarine
Beryllium aluminum silicate (Be3Al2Si6O18)
mineral
Arsenopyrite
Arsenopyrite (FeAsS)
mineral
Celestine (Celestite)
Strontium sulfate (SrSO4)
mineral
Red Moss Agate (Jasper)
Silicon Dioxide (SiO2) with Iron Oxide inclusions
sedimentary
Polished blue calcite sphere (tentative identification)
Calcite, CaCO₃; blue color generally results from trace impurities or inclusions
mineral
Obsidian
Volcanic Glass (SiO2)
igneous
Coquina
Bioclastic Limestone (composed primarily of CaCO3)
sedimentary
Tumbled granite
Granite, chiefly quartz, feldspar, and mica
igneous
Blue Apatite
Fluorapatite (Ca5(PO4)3F)
mineral
Hag Stone
Perforated Sedimentary Rock
sedimentary