Mineral Group

Weathered greenstone (probable serpentinite)

Serpentinite, dominated by serpentine-group minerals (antigorite/lizardite/chrysotile), with possible magnetite and iron oxides

Green serpentine or nephrite-like stone

Serpentine-group minerals, chiefly antigorite/lizardite; possibly nephrite jade (actinolite)

Tumbled greenish-gray stone, likely serpentinite or altered basalt

Probable serpentinite (serpentine-group minerals), possibly chlorite-/epidote-bearing basalt

Tumbled gray stone, likely serpentinite or weathered basalt

Tentatively serpentinite (predominantly serpentine-group minerals); identification is uncertain from the photograph

Serpentinite

Serpentinite (composed primarily of serpentine group minerals including antigorite, chrysotile, and lizardite)

Serpentinite

Serpentinite (composed largely of serpentine group minerals including antigorite, lizardite, and chrysotile)

Serpentine

Serpentinite (group of hydrous magnesium iron phyllosilicate minerals, e.g., Lizardite, Antigorite)

Serpentinite

Serpentinite (composed primarily of Serpentine group minerals like Antigorite, Lizardite, and Chrysotile)

Serpentine

Serpentinite (group of minerals: (Mg,Fe,Ni,Al)3Si2O5(OH)4)

Serpentinite

Serpentinite (composed primarily of serpentine group minerals like lizardite, antigorite, and chrysotile)

Hypersthene (or Enstatite/Ferrosilite)

Orthopyroxene series (Mg,Fe)SiO3 - specifically, historically hypersthene (intermediate member) now referred to as Enstatite (Mg-rich) or Ferrosilite (Fe-rich)

Greenstone (likely serpentinite or chlorite-rich metamorphic rock)

Probable serpentinite/chlorite schist; commonly dominated by serpentine-group minerals, chlorite, talc, and magnetite

Moldavite

Silica glass with small amounts of aluminum, iron, and other elements

Serpentine with quartz or calcite vein

Serpentinite; mainly serpentine-group minerals (Mg₃Si₂O₅(OH)₄), with a pale quartz/calcite vein

Serpentinite pebble

Serpentinite, composed chiefly of serpentine-group minerals (lizardite, chrysotile, antigorite), with possible magnetite and chlorite

Serpentinite (or Green Quartz Pebble)

Mg3Si2O5(OH)4 (Serpentine group) / SiO2 (Quartz mix)

Serpentine

Serpentine Group (primarily Antigorite or Lizardite), Mg3Si2O5(OH)4

Serpentinite

Serpentinite; chiefly serpentine-group minerals (antigorite, lizardite, chrysotile), commonly with magnetite and talc

Likely greenstone (serpentinized ultramafic rock)

Serpentinite, dominated by serpentine-group minerals (chrysotile/lizardite/antigorite), possibly with chlorite or epidote

Serpentine (likely serpentinized ultramafic rock)

Serpentine-group minerals, chiefly antigorite, lizardite, or chrysotile; commonly derived from peridotite

Serpentinite

Serpentinite (composed mainly of Serpentine-group minerals: (Mg, Fe)3Si2O5(OH)4)

Serpentinite

Serpentinite (composed primarily of Serpentine group minerals: (Mg,Fe)3Si2O5(OH)4)

Serpentinite

Serpentinite (composed primarily of Serpentine group minerals: (Mg,Fe)3Si2O5(OH)4)

Serpentinite

Serpentinite (composed primarily of Serpentine group minerals: (Mg,Fe)3Si2O5(OH)4)

Serpentinite

Serpentinite (composed primarily of Serpentine group minerals: (Mg,Fe)3Si2O5(OH)4)

Bivalve Fossil (Clam)

Class Bivalvia (Calcium Carbonate, CaCO3)

Serpentinite

Serpentinite (composed largely of Serpentine group minerals like Antigorite, Lizardite, and Chrysotile: Mg3Si2O5(OH)4)

Serpentine

Serpentine group (e.g., Antigorite, Chrysotile, Lizardite) - (Mg,Fe)3Si2O5(OH)4

Chert / Jasper / Agate (Chalcedony Group)

Microcrystalline Quartz (SiO2)

Probable serpentinite (serpentine-rich rock)

Serpentinite; chiefly serpentine-group minerals (Mg₃Si₂O₅(OH)₄), with possible magnetite and olivine remnants

Serpentinized ultramafic rock (likely serpentinite)

Serpentinite; chiefly serpentine-group minerals Mg₃Si₂O₅(OH)₄, with magnetite, olivine, and pyroxene remnants

Polished green serpentine (likely bowenite)

Serpentine-group minerals, chiefly antigorite and/or lizardite; bowenite is a compact, nickel-bearing serpentine variety

Pale green tumbled mineral fragment, likely serpentine or green calcite

Probable serpentine-group mineral (Mg3Si2O5(OH)4) or, less likely, calcite (CaCO3); identification is uncertain from the photograph

Polished serpentine pendulum

Serpentine-group minerals, chiefly antigorite/lizardite; approximate formula Mg₃Si₂O₅(OH)₄

Greenstone (likely serpentinite or greenstone pebble)

Serpentinite-rich ultramafic rock; commonly dominated by serpentine-group minerals, with possible chlorite, actinolite, or magnetite

Nephrite Jade

Nephrite (a variety of the mineral actinolite within the amphibole group); Chemical Formula: Ca2(Mg,Fe)5Si8O22(OH)2

Serpentinite (Serpentine Rock)

Serpentinite is a rock composed of one or more serpentine group minerals, chiefly antigorite, chrysotile, and lizardite, with the general formula (Mg,Fe)3Si2O5(OH)4. Often includes other minerals like magnetite, talc, and chromite.

Iron-stained garnet-bearing rock, possibly almandine garnet

Garnet-group silicate, likely almandine (Fe₃Al₂Si₃O₁₂), in a quartz–iron-oxide matrix

Sunstone and Green Aventurine

Sunstone: (Ca,Na)[(Al,Si)2Si2O8] (Plagioclase Feldspar Group); Green Aventurine: SiO2 (Quartz)

Iron Meteorite (Campo del Cielo)

Iron Meteorite, Group IAB (FeNi Alloy: Kamacite and Taenite)

Tumbled green-yellow stone, likely serpentine or nephrite jade

Serpentine-group mineral aggregate, commonly lizardite/antigorite; possible nephrite (interlocking tremolite-actinolite)

Greenstone, likely serpentinite

Serpentinite; predominantly serpentine-group minerals (Mg₃Si₂O₅(OH)₄), possibly with chlorite, talc, magnetite, or antigorite