Sedimentary Or Metamorphic (Low Grade)

Green schist (likely chlorite schist)

Chlorite schist; commonly dominated by chlorite, actinolite, epidote, quartz, and feldspar

Greenstone (probable altered basalt)

Chlorite–epidote–actinolite-rich greenschist; composition commonly derived from basalt

Soapstone (talc-rich schist)

Talc schist; chiefly hydrated magnesium silicate, Mg₃Si₄O₁₀(OH)₂

Calcite-rich limestone or marble fragment

Calcite (CaCO₃), likely recrystallized carbonate rock

Likely greenstone (metamorphosed basalt)

Greenschist or chlorite–epidote altered basalt; commonly composed of chlorite, epidote, actinolite, albite, and quartz

Green Greenstone / Celadonite-bearing Metamorphic Rock

Greenschist / Celadonite / Serpentinitic pebble

Greenstone / altered mafic rock

Likely chlorite–actinolite metabasalt (greenschist); exact identification requires testing

Greenstone (Greenschist facies)

Greenschist (composed primarily of Chlorite, Actinolite, and Epidote)

Greenstone

Greenschist (Greened Metabasalt)

Nephrite Jade

Nephrite (Ca2(Mg, Fe)5Si8O22(OH)2), a variety of Actinolite-Tremolite

Greenstone

Metabasalt / Greenschist facies rock

Greenstone

Greenschist / Meta-basalt

Conglomerate

Clastic Sedimentary Rock

Blue Chalcedony

Silicon Dioxide (SiO2)

Tiger's Eye

Quartz with riebeckite inclusions (SiO2)

Weathered iron-rich rock (likely ironstone)

Ferruginous ironstone, composed chiefly of iron oxides/hydroxides such as goethite (FeO(OH)) and hematite (Fe₂O₃)

Stiped Slate Beach Pebble

Low-grade Metamorphic Slate with Quartz Vein (SiO2 on Phyllosilicate base)

Ironstone Concretion

Ferruginous Concretion (Fe2O3·nH2O)

Graphitic schist (probable)

Graphite-bearing mica schist; chiefly quartz, mica, and graphite

Polished tiger’s-eye

Quartz-rich tiger’s-eye; mainly SiO₂ with iron oxides and fibrous pseudomorphs after crocidolite

Dark gray metamorphic rock, likely slate or phyllite

Slate/phyllite; commonly quartz–mica–chlorite aggregate

Tumbled green serpentine (likely nephrite jade imitation/alternative)

Serpentine-group minerals, chiefly antigorite and lizardite; composition approximately Mg₃Si₂O₅(OH)₄

Biotite mica schist (probable)

Mica schist, dominated by biotite; approximate mica formula K(Mg,Fe)₃AlSi₃O₁₀(OH)₂

Limonite (Ironstone Concretion)

Hydrous ferric oxides (FeO(OH)·nH2O)

Green Jasper / Metavesuvianite-bearing rock

Silica-rich microcrystalline quartz aggregate / Green Jasper

Fluorite

Calcium Fluoride (CaF2)

Ironstone Concretion

Ferruginous Concretion

Ironstone Concretion

Ironstone (Limonite/Goethite Concretion)

Ironstone Concretion

Siderite or Limonite Concretion (FeCO3 or FeO(OH)·nH2O)

Limonite Concretion

Limonite (Hydrated iron(III) oxide-hydroxides, FeO(OH)·nH2O)

Ruby (Corundum)

Aluminum oxide (Al2O3) with Chromium traces

Limonite / Ironstone Concretions

Hydrated iron(III) oxide-hydroxide (FeO(OH)·nH2O)

Tumbled tiger’s-eye

Tiger’s-eye (chatoyant quartz), SiO₂, pseudomorphic fibrous quartz after crocidolite

Rounded greenstone cobble

Likely greenschist or altered basalt; composition commonly chlorite, epidote, actinolite, albite, and quartz

Serpentinite

Serpentinite (Hydrated Magnesium Silicate Mg3Si2O5(OH)4)

Iron-rich jasper (likely brecciated jasper)

Microcrystalline quartz/chalcedony (SiO₂) colored by hematite/goethite; possibly iron formation

Prehnite

Prehnite (Ca2Al2Si3O10(OH)2)

Greenschist

Greenschist facies rock

Epidote in Quartz

Epidote (Ca2(Al,Fe)3(SiO4)3(OH)) in Milky Quartz (SiO2)

Jadeite (Nephrite-Jadeite blend)

Jadeite (NaAlSi2O6)

Lapis Lazuli

Lapis Lazuli (Complex silicate: Na8[Al6Si6O24]Sn)

Likely tumbled tiger’s eye

Quartz (SiO₂) with fibrous crocidolite pseudomorphed by quartz; iron oxides produce the golden-brown color