Sandstone (Pebble)
Sandstone (SiO2 with iron oxide impurities)
sedimentary
Category
Metamorphic Rock (For Nephrite And Some Jadeite); Mineral (For Jadeite)
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Clear Quartz
Silicon Dioxide (SiO2)
mineral
Biotite Mica
Biotite, K(Mg,Fe)3AlSi3O10(F,OH)2
mineral
Weathered greenstone (likely serpentinite or altered basalt)
Serpentinite-group rock, commonly dominated by serpentine minerals (antigorite/lizardite); exact identification requires testing
metamorphic
Sandstone
Clastic sedimentary rock (SiO2 primary)
sedimentary
Labradorite
Labradorite (Ca,Na)(Al,Si)4O8
mineral
Sodalite
Sodalite (Na8Al6Si6O24Cl2)
mineral
Fuchsite (Green Muscovite)
Fuchsite (Chromium-rich Muscovite), K(Al,Cr)2(AlSi3O10)(OH)2
mineral
Serpentine-rich serpentinite pebble
Serpentinite, composed chiefly of serpentine-group minerals (lizardite, antigorite, chrysotile), commonly with magnetite and minor brucite
metamorphic
Gneiss
Gneiss
metamorphic
Epidote
Epidote ({Ca2}{Al2Fe3+}(Si2O7)(SiO4)O(OH))
mineral
Smoky Quartz
Silicon Dioxide (SiO2)
mineral
Quartzite Pebble
Metamorphosed Quartz Sandstone
metamorphic
Sandstone
Sandstone (SiO2-dominated clastic rock)
sedimentary
Epidosite
Epidosite (composed mainly of Epidote - {Ca2}{Al2Fe3+}(Si2O7)(SiO4)O(OH))
metamorphic
Tiger Iron
Tiger Iron (Hematite, Red Jasper, and Chert/Tiger's Eye composite)
metamorphic
Epidote
Epidote (Ca2(Al2,Fe3+)(SiO4)(Si2O7)O(OH))
mineral
Quartzite
Quartzite (primarily SiO2)
metamorphic
Bornite
Bornite (Cu5FeS4)
mineral
Pegmatite (Granitic Pegmatite with Quartz, Mica, and Tourmaline/Biotite)
Pegmatite
igneous
Magnetite (Iron Ore)
Magnetite (Fe3O4)
mineral
Greenstone / Greenschist
Greenschist (composed primarily of Chlorite, Epidote, and Actinolite)
metamorphic
Garnet Schist
Almandine Garnet Schist (Fe3Al2(SiO4)3 in Schistose matrix)
metamorphic
Pegmatite (Quartz, Feldspar, and Tourmaline/Biotite)
Pegmatitic Igneous Rock
igneous
Amazonite
Microcline Feldspar (KAlSi3O8)
mineral
Gneiss
Gneiss
metamorphic
Tumbled greenstone (likely serpentine)
Serpentinite; mainly serpentine-group minerals, commonly antigorite, lizardite, or chrysotile
metamorphic
Quartzite River Rock
Quartzite (primarily SiO2)
metamorphic
Milky Quartz with Chlorite/Epidote
Silicon Dioxide (SiO2) with phyllosilicate or sorosilicate inclusions
mineral
Weathered serpentinite (likely serpentine-rich rock)
Serpentinite; chiefly serpentine-group minerals, Mg₃Si₂O₅(OH)₄, with possible magnetite and accessory minerals
metamorphic
Granitoid Gneiss with Feldspar Vein
Gneiss (High-grade Metamorphic Rock) with Potassium Feldspar (KAlSi3O8)
metamorphic
Sandstone
Arenite (clastic sedimentary rock)
sedimentary
Concretion in Shale
Siltstone/Shale with Siderite or Calcareous concretions
sedimentary
Mixed Mineral Bead Bracelet
Polycrystalline and Monocrystalline Silicates/Oxides (Quartz, Howlite, Hematite)
gemstone
Quartz-veined Mudstone or Argillite
SiO2 (Quartz) in Siltstone/Mudstone matrix
sedimentary
Fluorite
Fluorite (CaF₂)
mineral
Quartzite
Metamorphic rock primarily composed of Quartz (SiO2)
metamorphic
Serpentinite
Serpentinite (composed primarily of serpentine-group minerals like antigorite, chrysotile, and lizardite; chemical formula varies but generally Mg3Si2O5(OH)4)
Metamorphic Rock
Smoky Quartz
Smoky Quartz (Silicon Dioxide, SiO2)
mineral
Smoky Quartz
Silicon Dioxide (SiO2)
mineral
Aquamarine
Beryl (Be3Al2Si6O18) with trace Iron (Fe2+)
mineral
Quartzite pebble
Quartzite (principally SiO2)
metamorphic