Metamorphic (Altered Igneous Rock)

Unakite

Epidote–pink feldspar–quartz rock

Polished mixed rock, likely orbicular/epidote-bearing granite or basalt

Uncertain; probable quartz–feldspar–amphibole/epidote aggregate

Weathered quartz-rich metamorphic rock (probable quartzite or quartz vein rock)

Quartz-dominant rock; chiefly SiO₂, with minor iron-oxide and mica/clay impurities

Green serpentine-rich rock (possibly serpentinite)

Serpentinite, composed chiefly of serpentine-group minerals (e.g., lizardite, antigorite, or chrysotile)

Green Serpentine

Serpentine group (Mg,Fe,Ni,Al,Zn,Mn)3(Si,Al,Fe)2O5(OH)4

Pale greenish stone, likely serpentine or altered ultramafic rock

Serpentinite (主要 minerals: antigorite/lizardite, Mg3Si2O5(OH)4); identification is tentative from the image

Likely garnet-bearing rock fragment

Garnet-bearing schist or gneiss; garnet is commonly almandine, Fe₃Al₂(SiO₄)₃

Weathered iron-rich rock, possibly limonite-bearing basalt or ironstone

Indeterminate; likely basaltic or ferruginous rock containing iron oxides/hydroxides such as hematite (Fe₂O₃) and limonite/goethite

Weathered iron-rich rock, possibly basalt or ironstone

Likely vesicular basalt or ferruginous breccia; exact identification requires testing

Weathered granitic rock

Granite or granodiorite; chiefly quartz, feldspar, and mica/amphibole

Weathered quartz-rich pebble

Likely quartzite or silicified granitoid; mainly microcrystalline quartz (SiO₂)

Serpentine-rich greenstone (probable serpentinized ultramafic rock)

Serpentinite; chiefly serpentine-group minerals (Mg₃Si₂O₅(OH)₄), commonly with magnetite, chromite, and relict olivine/pyroxene

Painted Rock / Geode Specimen

Silicon Dioxide with artificial pigment coating

Iron-stained quartzite or silicified breccia

Quartz-rich rock dominated by microcrystalline quartz (SiO₂), with iron oxides/hydroxides such as hematite and goethite

Porphyritic volcanic rock, likely andesite or rhyolite

Porphyritic andesite–rhyolite; chiefly plagioclase, quartz, and altered ferromagnesian minerals in a fine groundmass

Iron-rich volcanic rock, possibly hematite-bearing basalt

Basalt with iron oxides/hydroxides, chiefly hematite (Fe₂O₃) and possibly magnetite (Fe₃O₄)

Weathered iron-rich rock, possibly limonite-bearing basalt or ironstone

Uncertain; likely Fe-oxide/hydroxide–stained mafic rock (hematite Fe₂O₃, goethite FeO(OH), and silicates)

Weathered iron-rich quartz vein in altered host rock

Goethite–hematite limonite with quartz and iron-oxide alteration

Weathered quartz-rich rock, possibly quartzite or silicified sandstone

Quartz-dominant aggregate; likely microcrystalline quartz (SiO₂), but exact identification requires testing

Weathered quartz-rich pebble, possibly granite or pegmatite

Quartz (SiO₂) with probable feldspar and minor mica/iron-oxide inclusions

Serpentinite

Serpentinite (Mg, Fe, Ni, Al, Zn, Mn)2-3(Si, Al, Fe)2O5(OH)4

Tumbled lapis lazuli

Lapis lazuli; predominantly lazurite, (Na,Ca)₈(AlSiO₄)₆(S,SO)₄, with calcite and pyrite

Quartzite

Metamorphic Quartzite (SiO2)

Weathered greenstone (likely serpentinite or altered basalt)

Serpentinite-group rock, commonly dominated by serpentine minerals (antigorite/lizardite); exact identification requires testing

Green-and-black mottled metamorphic rock (likely serpentinite)

Serpentinite, composed mainly of serpentine-group minerals (e.g., antigorite or lizardite); identification from the photo is provisional.

Greenstone (likely serpentinite)

Serpentinite, chiefly serpentine-group minerals (Mg₃Si₂O₅(OH)₄), possibly with chlorite or magnetite

Weathered greenish metamorphic rock, possibly serpentinite

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

Citrine (Heat-treated or Natural Quartz)

Silicon Dioxide (SiO2)

Greenish quartz (likely prase/chalcedony)

Quartz, SiO₂; possibly green chalcedony or chlorite-included quartz

Weathered quartz-bearing rock, possibly granite or pegmatite

Likely quartz–feldspar rock; exact mineral identification is uncertain from the photograph

Blue-gray metamorphic rock, possibly slate or phyllite

Likely quartz–mica-rich phyllite/slate; exact identification requires testing

Quartzite with Mica Matrix

Metamorphic Quartz-Mica Schist/Quartzite

Green-and-black serpentine-rich rock

Serpentinite, likely with magnetite and chlorite/pyroxene

Banded Rock (likely Quartz-rich)

Uncertain, likely a Metamorphic Rock (e.g., Gneiss or Schist) with prominent Quartz and other minerals

Serpentinite (serpentinized ultramafic rock)

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

Likely greenstone (serpentinized ultramafic rock)

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

Yellow serpentine (likely lemon chrysoprase/serpentine breccia)

Serpentine-group minerals, chiefly antigorite/lizardite; commonly mixed with magnesite and iron oxides

Weathered basaltic rock

Basalt, likely vesicular or altered basalt

Nephrite Jade

Nephrite

Unakite (or Epidotized Granite)

Epidotized Granite (Composition: KAlSi3O8, Ca2(Al,Fe)3(SiO4)3(OH), SiO2)

Drill core of probable granite or granodiorite

Crystalline quartz–feldspar–mica rock; exact composition cannot be confirmed from the photograph

Polished pink feldspar-rich rock, possibly unakite

Likely unakite (epidote, pink potassium feldspar, and quartz); identification is uncertain from the photo