Basalt
Extrusive igneous rock
Category
Browse mineral group specimens identified by the Rock Identifier community.
Basalt
Extrusive igneous rock
Quartz-rich pegmatite (likely milky quartz with feldspar and mica)
Granite pegmatite; chiefly quartz (SiO₂), with feldspar and mica-group minerals
Lapis Lazuli
Lapis lazuli (primary component: Lazurite (Na,Ca)8(AlSiO4)6(S,Cl,SO4,OH)2)
Serpentine (likely antigorite-rich serpentinite)
Serpentinite; chiefly serpentine-group minerals, Mg₃Si₂O₅(OH)₄, with dark magnetite/chromite or pyroxene inclusions
Basalt with Garnet inclusions
Basalt containing Nesosilicate (Garnet Group, likely Almandine Fe3Al2Si3O12)
Serpentinite (likely)
Serpentinite, dominated by serpentine-group minerals (antigorite, lizardite, or chrysotile)
Tumbled greenstone (likely serpentine)
Serpentinite, composed chiefly of serpentine-group minerals (Mg₃Si₂O₅(OH)₄)
Serpentine (likely serpentinite)
Serpentine-group minerals, chiefly antigorite/lizardite; commonly with magnetite and carbonate
Fossil Bivalve Shell
Class Bivalvia (e.g., Veneriidae family)
Tumbled serpentine
Serpentinite; chiefly serpentine-group minerals (antigorite, lizardite, chrysotile)
Greenish rough stone, possibly serpentine or soapstone
Indeterminate from the image; possible serpentinite (serpentine-group minerals) or talc-rich soapstone
Stream-worn greenstone (likely serpentinite or altered basalt)
Serpentinite, chiefly serpentine-group minerals; possibly chlorite–actinolite greenstone
Chondrite Meteorite
Ordinary Chondrite (L or H group)
Serpentine (possibly New Jade)
Serpentine group, Mg3Si2O5(OH)4
Chondrite Meteorite
Ordinary Chondrite (L or H group)
Chondrite Meteorite
Ordinary Chondrite (L or H group)
Serpentine / Antigorite
Mg3Si2O5(OH)4 (Serpentine Group)
Serpentine
Serpentine Group (Mg3Si2O5(OH)4)
Serpentine-rich rock
Serpentinite; chiefly serpentine-group minerals, Mg₃Si₂O₅(OH)₄
Polished serpentine (likely antigorite or bowenite)
Serpentine-group minerals, chiefly Mg₃Si₂O₅(OH)₄
Garnet
Group of silicate minerals (e.g., Almandine: Fe3Al2(SiO4)3)
Likely polished garnet fragment
Garnet group, possibly almandine (Fe₃Al₂Si₃O₁₂)
Serpentinite
Serpentinite, composed chiefly of serpentine-group minerals (e.g., antigorite, lizardite, chrysotile)
Tumbled dark-green stone, possibly serpentine
Undetermined; serpentine-group rock (predominantly serpentine minerals) is a tentative visual identification
Serpentinite
Serpentinite, composed mainly of serpentine-group minerals (approximately Mg₃Si₂O₅(OH)₄)
Likely polished greenstone or serpentine inlay
Serpentine-group mineral, commonly antigorite/lizardite; possibly nephrite jade
Rough ruby-bearing green zoisite
Ruby (corundum, Al₂O₃) in green zoisite (epidote-group mineral)
Polished pale-green stone, likely serpentine or green aventurine
Serpentine-group minerals, chiefly antigorite/lizardite; possibly quartz-rich aventurine
Greenstone pebble (likely serpentinite or altered basalt)
Serpentinite, predominantly serpentine-group minerals; exact identification requires testing
Spinifex Textured Komatiite
Komatiite (Mg-rich ultramafic volcanic rock)
Garnet (likely Almandine or Pyrope)
Garnet (Group Name), Fe3Al2(SiO4)3 or Mg3Al2(SiO4)3
Tumbled serpentine or chlorite-rich pebble
Serpentine-group minerals, chiefly antigorite/lizardite; possibly chlorite or greenstone
Polished serpentine pebble
Serpentinite, composed chiefly of serpentine-group minerals (e.g., lizardite, antigorite, chrysotile)
Moonstone (specifically Rainbow Moonstone / White Labradorite)
White Labradorite (Feldspar Group: (Na,Ca)(Al,Si)4O8)
Assorted polished river pebbles
Mixed lithologies, likely quartzite, chert, jasper, and weathered igneous/metamorphic rocks
Basalt
Extrusive Igneous Rock (Mafic)
Bivalve Fossil (Clam)
Class Bivalvia (e.g., Mercenaria or similar genus), composed of CaCO3 (Aragonite/Calcite)
Blue Apatite
Fluorapatite / Apatite group (Ca5(PO4)3(F,Cl,OH))
Serpentinite with green serpentine inclusion
Serpentinite; serpentine-group minerals, chiefly antigorite, lizardite, or chrysotile, with possible magnetite
Moonstone
Adularia (orthoclase) or Albite (plagioclase), a potassium aluminum silicate of the feldspar group
Dark green-black stone, possibly serpentinite
Serpentinite (predominantly serpentine-group minerals; identification from photo is uncertain)
Serpentinite pebble
Serpentinite, composed mainly of serpentine-group minerals (commonly antigorite, lizardite, or chrysotile)