Metamorphic Or Igneous Alteration

Stream-worn greenstone (likely serpentinite or altered basalt)

Serpentinite, chiefly serpentine-group minerals; possibly chlorite–actinolite greenstone

Greenstone (likely chlorite- or epidote-rich metamorphic rock)

Greenstone; commonly metamorphosed basalt or dolerite, with chlorite, epidote, and actinolite

Uncertain pale green-gray mineral/rock fragment

Possibly serpentine-bearing rock or greenstone; exact identification requires testing

Red faceted gemstone ring

Likely synthetic ruby or red spinel; exact identification requires testing

Unakite

Epidotized Granite

Quartz Vein in Host Rock

Silicon Dioxide (SiO2) within Metasedimentary or Igneous Matrix

Massive Quartz with Host Rock

Silicon Dioxide (SiO2)

Yellow faceted gemstone, likely citrine or yellow sapphire

Uncertain; probable quartz (SiO₂) or corundum (Al₂O₃)

Fuchsite Schist

Chromium-rich Muscovite (K(Al,Cr)2(AlSi3O10)(OH)2) in Schist

Nephrite Jade

Tremolite-Actinolite series: Ca2(Mg,Fe)5Si8O22(OH)2

Nephrite Jade

Nephrite (Ca2(Mg, Fe)5Si8O22(OH)2)

Fuchsite on Quartz

Muscovite (KAl2(AlSi3O10)(OH)2) with Chromium impurities

Serpentine

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

Epidosite (Unakite-related)

Epidosite (composed primarily of Epidote and Quartz)

Gold-bearing quartz vein rock

Milky quartz (SiO₂) with probable native gold and iron-oxide staining

Dragon Blood Jasper

Microcrystalline Quartz (Chalcedony) with Epidote and Piemontite

Polished green stone, likely serpentine or nephrite jade

Serpentine-group minerals (commonly antigorite/lizardite) or nephrite, a fibrous tremolite–actinolite aggregate

Polished greenstone (likely serpentine or altered basalt)

Serpentinite, chiefly serpentine-group minerals; possible chlorite/actinolite-bearing greenstone

Epidote

Epidote (Ca2(Al2,Fe3+)(SiO4)(Si2O7)O(OH))

Fuchsite (Chrome Mica)

K(Al,Cr)2(AlSi3O10)(OH)2

Nephrite Jade

Nephrite (Ca2(Mg, Fe)5Si8O22(OH)2)

Nephrite Jade

Nephrite (Ca2(Mg, Fe)5Si8O22(OH)2)

Lapis Lazuli

Lapis Lazuli (Rock containing Lazurite (Na,Ca)8(AlSiO4)6(S,SO4,Cl)1-2, Calcite, and Pyrite)

Milky quartz (iron-stained quartz)

Quartz, silicon dioxide (SiO₂)

Dark gray rock fragment

Indeterminate from image; possibly weathered basalt or fine-grained metamorphic rock

Polished gray-white stone, likely serpentinized marble or soapstone

Uncertain; probable serpentinite-bearing carbonate rock, chiefly calcite/dolomite with serpentine and dark accessory minerals

Unakite

Epidotized Granite

Prehnite

Ca2Al(AlSi3O10)(OH)2

Serpentinite

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

Prehnite

Prehnite (Ca2Al(AlSi3O10)(OH)2)

Hematite

Iron(III) oxide (Fe2O3)

Greenstone (likely metamorphosed mafic rock)

Probable chlorite–actinolite–epidote-rich metabasalt; exact identification requires testing

Serpentinite

Serpentinite, a rock composed mainly of serpentine-group minerals (approximately Mg₃Si₂O₅(OH)₄)

Black Star Diopside

Diopside (CaMgSi2O6) with Magnetite inclusions

Hematite

Iron(III) oxide (Fe2O3)

Green-gray tumbled stone, possibly nephrite jade

Possible nephrite (interlocking tremolite–actinolite amphibole); identification is uncertain from the photograph

Green jade-like carved pendant or worry stone

Likely nephrite jade (tremolite–actinolite), but the image alone cannot confirm the material

Pink-and-gray rhodonite

Rhodonite, manganese inosilicate (MnSiO₃), commonly with manganese oxides

Citrine

Silicon Dioxide (Quartz variety), SiO2

Aventurine

Quartz with fuchsite inclusions (SiO2)

Polished tiger’s eye

Quartz (microcrystalline SiO₂) with crocidolite-derived iron oxides

Serpentinite

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