Tumbled green-and-white stone, likely serpentine
Serpentinite; chiefly serpentine-group minerals (antigorite, lizardite, or chrysotile), commonly with magnetite and carbonate veins
metamorphic
Category
Mineral And Metamorphic Rock
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Limonite Concretion
Limonite (FeO·nH2O)
mineral
Bull Quartz with Mica and Host Rock
Massive Quartz (SiO2) with Muscovite/Chlorite inclusions
igneous
Serpentinite
Serpentinite (Mg, Fe, Ni, Al, Zn, Mn)2-3(Si, Al, Fe)2O5(OH)4
metamorphic
Lapis Lazuli
Lapis Lazuli (a rock, not a single mineral; primary mineral is Lazurite (Na,Ca)8(AlSiO4)6(S,SO4,Cl)1-2
Metamorphic rock
Quartzite Arrowhead
Quartzite (SiO2 silicon dioxide)
metamorphic
Gneiss
Gneiss
metamorphic
Quartz
Quartz (SiO2 - Silicon Dioxide)
Mineral
Rutilated Quartz
Quartz (SiO2) with Rutile (TiO2) inclusions
Mineral
Quartz (Clear / Rock Crystal)
Silicon Dioxide (SiO2)
Mineral
Serpentine
Serpentinite (group of hydrous magnesium iron phyllosilicate minerals)
metamorphic
Serpentine
Serpentine-group ((Mg,Fe,Ni,Al,Zn,Mn)3(Si,Al,Fe)2O5(OH)4)
metamorphic
Unakite
Unakite (Epidote-Feldspar rock)
Metamorphic rock
Gneiss (specifically a Banded Gneiss cobble)
Gneiss (composed mainly of Quartz, Feldspar, and Biotite/Amphibole)
metamorphic
Zebra Rock / Zebra Marble
Banded Limestone-Marble Transition
metamorphic
Quartz Crystal (specifically Rock Crystal)
Silicon Dioxide (SiO2)
mineral
Serpentinite
Serpentinite (composed largely of serpentine group minerals including antigorite, lizardite, and chrysotile)
metamorphic
Dragon Blood Jasper
Epidote with Red Jasper inclusions (SiO2 and Ca2(Al,Fe)3(SiO4)3(OH))
metamorphic
Quartzite River Rock (with iron staining)
Metamorphosed Sandstone (SiO2)
metamorphic
Agate
Silicon Dioxide (Chalcedony), SiO2
sedimentary
Clear Quartz (Rock Crystal)
Silicon Dioxide (SiO2)
mineral
Pyrite-bearing metamorphic rock (probable pyrite schist)
Schist containing pyrite (FeS₂), with probable quartz and mica
metamorphic
Quartzite Pebble (Stream-rounded Quartz/Quartzite Gravel)
Quartzite / Silicon Dioxide (SiO2)
metamorphic
Tiger's Eye
Pseudomorph of Quartz after Crocidolite (SiO2)
metamorphic
Pink Sapphire
Corundum (Al2O3 with trace Chromium and Iron)
mineral
Greenstone with Pyrite inclusions
Greenschist / Meta-volcanic rock with Iron Disulfide (FeS2)
metamorphic
Clear Quartz (Rock Crystal)
Silicon Dioxide (SiO2)
mineral
Quartzite pebble
Metamorphic Quartzite (SiO2)
metamorphic
Schist
Mica Schist (primarily Muscovite or Biotite sheet silicates)
metamorphic
Tiger's Eye
Tiger's Eye (a variety of Chalcedony, which is a microcrystalline quartz with fibrous inclusions of oxidized crocidolite)
Mineral
Jade (Nephrite or Jadeite)
Nephrite (Ca2(Mg,Fe)5Si8O22(OH)2) or Jadeite (Na(Al,Fe3+)Si2O6)
Mineral
Quartz-rich metamorphic rock, likely quartzite
Quartzite; predominantly microcrystalline quartz (SiO₂), possibly with feldspar, mica, and iron-oxide impurities
metamorphic
Dark metamorphic rock, likely biotite schist or gneiss
Quartz–feldspar–biotite metamorphic rock; exact identification requires a fresh surface and testing
metamorphic
Gneiss
Gneiss (Metamorphic rock composed primarily of Quartz, Feldspar, and Mica/Amphibole)
metamorphic
Quartzite
Quartzite (Primary mineral: SiO2)
Metamorphic
Fuchsite (Chrome Mica)
K(Al,Cr)2(AlSi3O10)(OH)2
mineral
Clear Quartz (Rock Crystal)
Silicon Dioxide (SiO2)
mineral
Milky Quartz
Quartz (Silicon Dioxide, SiO2)
mineral
Rock Crystal Quartz
Quartz (SiO₂)
Mineral
Quartzite
Metamorphic Quartzite (primarily SiO2)
metamorphic
Serpentinite
Serpentinite (complex silicate minerals including Mg3Si2O5(OH)4)
metamorphic
Moonstone (bead form)
Potassium Aluminum Silicate (KAlSi3O8) - a variety of Orthoclase Feldspar
Mineral