Metamorphic Rock (For Both Nephrite And Jadeite)

Sandstone

Arenite (primarily SiO2)

Tumbled pale-green mineral specimen, likely aventurine or serpentine

Quartzite with fuchsite (aventurine) or serpentine-group mineral; exact identification requires testing

Tumbled greenstone, likely nephrite jade

Nephrite jade (interlocking tremolite–actinolite amphibole; Ca₂(Mg,Fe)₅Si₈O₂₂(OH)₂)

Clear Quartz (or Rock Crystal)

Quartz (SiO₂)

Quartz Pebble

Silicon Dioxide (SiO2)

Green Aventurine

Quartz with Fuchsite inclusions (SiO2 + K(Al,Cr)2AlSi3O10(OH)2)

Quartz with Muscovite Mica

Silicon Dioxide (SiO2) with Potassium Aluminum Silicate Hydroxide Fluoride (KAl2(AlSi3O10)(F,OH)2)

Tumbled greenstone (likely serpentinite or nephrite)

Serpentinite: Mg-rich serpentine minerals; possible nephrite: tremolite–actinolite amphibole

Possible rough agate/chalcedony nodule

Microcrystalline quartz (SiO₂), likely chalcedony or agate

Tumbled greenstone or serpentine pebble

Serpentinite, chiefly serpentine-group minerals (Mg₃Si₂O₅(OH)₄); possibly nephrite jade if notably tough and dense

Almandine Garnet & Tumbled Citrine Quartz

Fe3Al2(SiO4)3 (Garnet) and SiO2 (Quartz)

Polished greenstone / serpentine (probable)

Serpentinite, dominated by serpentine-group minerals such as antigorite, lizardite, or chrysotile

Scoria

Vesicular Mafic Igneous Rock

Sandstone (likely Arkose or Quartz Sandstone)

Arenite (SiO2 + varied clasts)

Tumbled serpentinite (serpentine stone)

Serpentinite, dominated by serpentine-group minerals (lizardite, chrysotile, antigorite), commonly with magnetite and chromite

Quartz (Milky/Clear)

Silicon Dioxide (SiO2)

Quartz Pebble

Silicon Dioxide (SiO2)

Granite Cobble

Intrusive Igneous Rock (Felsic to Intermediate)

Greenstone / Greenschist

Greenschist (containing Chlorite, Epidote, Actinolite)

Polished serpentine pendant

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

Tumbled reddish-brown stone, possibly jasper or quartzite

Uncertain; likely microcrystalline quartz (SiO₂), potentially iron-stained jasper

Quartz Pebble

Silicon Dioxide (SiO2)

Sandstone

Arenite (composed primarily of SiO2)

Serpentine (serpentinite)

Serpentine-group minerals: mainly antigorite, lizardite, and/or chrysotile; commonly with magnetite and carbonate

Quartzite Pebble

Quartzite (primarily SiO2)

Sandstone (Quartz Arenite)

Sandstone (Chemical formula: primarily SiO2)

Amethyst and Rose Quartz Jewelry

Silicon Dioxide (SiO2)

Quartz pebble

Silicon dioxide (SiO2)

Quartz Pebble

Silicon Dioxide (SiO2)

Black faceted gemstone, possibly black spinel or onyx

Undetermined; candidates include spinel (MgAl₂O₄) or chalcedony (SiO₂)

Tumbled green aventurine (probable)

Quartz variety: aventurine quartz, SiO₂, colored commonly by fuchsite mica

Nephrite Jade (Hetian Yu)

Tremolite-Actinolite solid solution Ca2(Mg,Fe)5Si8O22(OH)2

Tumbled green aventurine (probable)

Quartz-rich aventurine; SiO₂ with dispersed fuchsite mica or other green inclusions

Tourmaline (Mixed colors)

Boron silicate mineral (Na,Ca)(Li,Mg,Al,Fe,Mn,Ti,V,Cr)3Al6(BO3)3Si6O18(OH,F)4

Likely raw emerald or green beryl

Beryl, Be₃Al₂Si₆O₁₈; green color typically from chromium or vanadium

Milky Quartz

Silicon Dioxide (SiO2)

Tumbled stone, possibly green jasper or serpentine

Indeterminate from the photo; likely a jasper (microcrystalline quartz, SiO₂) or serpentine-group material

Sandstone

Arenite (primarily SiO2)

Lavender chalcedony (possibly light amethyst) pendant

Chalcedony: microcrystalline quartz, SiO₂; exact identification requires testing

Green Aventurine

Silicon Dioxide (Quartz with Fuchsite inclusions), SiO2

Herkimer Diamond

Quartz (Silicon Dioxide, SiO2)

Milky quartz fragment

Quartz (silicon dioxide, SiO₂)