Beryl (var. Aquamarine/Blue Beryl) in Quartz Matrix
Beryllium Aluminum Silicate (Be3Al2Si6O18)
mineral
Category
Sedimentary (Chemically Precipitated) Or Metamorphic
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Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Red Jasper
Microcrystalline Quartz (SiO2)
sedimentary
Ironstone concretion (probable hematite–goethite-rich ironstone)
Iron oxide/hydroxide concretion; chiefly hematite (Fe₂O₃) and goethite (FeO(OH)), with possible magnetite and quartz
sedimentary
Iron Ore (Hematite/Magnetite mixture)
Ferrous Oxide (Fe2O3 / Fe3O4)
sedimentary
Quartzite with Hematite staining
Metamorphic Quartz (SiO2) with Ferric Oxides
metamorphic
Likely tumbled quartz-rich pebble
Quartz (SiO₂), possibly a weathered quartzite or chalcedony pebble
mineral
Agate
Silicon dioxide (Chalcedony), SiO2
sedimentary
Muscovite Mica (with Schist)
Muscovite - KAl2(AlSi3O10)(OH)2
metamorphic
Almandine Garnet
Almandine, Fe3Al2(SiO4)3
mineral
Nephrite Jade
Ca2(Mg, Fe)5Si8O22(OH)2
metamorphic
Raw Calcite
Calcite (Calcium Carbonate - CaCO3)
mineral
Quartz Geode
Silicon Dioxide (SiO2) in Geode form
sedimentary
Quartzite Pebble
Metamorphic Quartzite (SiO2)
metamorphic
Quartzite
Quartzite (chiefly SiO2)
metamorphic
Quartzite
Quartzite (primarily SiO2)
metamorphic
White Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Tiger's Eye
Tiger's eye (Pseudomorph of Quartz after Crocidolite), SiO2
metamorphic
Jasper pebble (possibly Red Jasper or Lake Superior Agate/Jasper mix)
Silicon Dioxide (SiO2) with Hematite inclusions
sedimentary
Red Jasper
Silicon Dioxide with Iron Oxide (SiO2 + Fe2O3)
sedimentary
Jasper with Quartz inclusion
Silicon Dioxide (SiO2) - Microcrystalline Quartz
sedimentary
Limonite-stained Quartz / Quartzite
Silicon Dioxide (SiO2) with iron hydroxides (FeO(OH)·nH2O)
sedimentary or metamorphic
Quartzite Pebble
Metamorphic Quartzite (SiO2)
metamorphic
Celadonite in Basalt (Green Earth)
Celadonite (K(Mg,Fe2+)(Fe3+,Al)Si4O10(OH)2)
mineral
Quartz Vein in Schist / Gneiss Metamorphic Matrix
Silicon Dioxide (SiO2) in metamorphic schist host rock
metamorphic
Quartzite
Quartzite (Metamorphic Quartz Sandstone)
metamorphic
Agate
Silicon dioxide (Chalcedony), SiO2
sedimentary
Quartzite
Quartzite (primarily SiO2)
metamorphic
Quartzite
Quartzite (composed primarily of SiO2)
metamorphic
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Milky Quartz Pebble with Iron Inclusions
Silicon Dioxide (SiO2) with iron oxide impurities
sedimentary
Quartzite (River Pebble)
Metamorphosed Quartz Sandstone (SiO2)
metamorphic
Quartzite Pebble
Metamorphosed Quartz Sandstone (SiO2)
metamorphic
Dyed Magnesite (Howlite imitation)
Magnesium carbonate (MgCO3) with dye
mineral
Serpentinite
Serpentinite (Mg, Fe, Ni, Al, Zn, Mn)2-3(Si, Al, Fe)2O5(OH)4
metamorphic
Quartz Pebble (often referred to as 'Sea Glass' or 'River Stone' when worn smooth)
Silicon Dioxide (SiO2)
mineral
Iron-rich concretion or weathered ironstone
Goethite–hematite limonite aggregate; commonly described as limonite or ironstone
sedimentary
Quartzite
Quartzite (SiO2)
metamorphic
Quartz Pebble
Silicon Dioxide (SiO2) Pebble
sedimentary
Quartzite Pebble
Quartzite (SiO2)
metamorphic
Quartz Fragment
Silicon Dioxide (SiO2)
mineral
Chert / Flint
Microcrystalline Quartz (SiO2)
sedimentary