Sedimentary Or Metamorphic (Low Grade)

Tumbled ruby-bearing corundum

Corundum (Al₂O₃), likely ruby variety

Greenschist (Chlorite Schist)

Greenschist (Metamorphic rock dominated by chlorite, actinolite, and epidote)

Rounded, striated pebble—likely slate or fine-grained metamorphic rock

Slate/phyllite; predominantly quartz, mica, and clay-derived minerals

Rough Emerald

Beryl (Be3Al2Si6O18 with Chromium/Vanadium impurities)

Conglomerate

Conglomerate (clastic sedimentary rock)

Jadeite

Jadeite (NaAlSi2O6)

Tumbled greenstone, likely serpentine or altered basalt

Serpentine-group minerals, chiefly Mg₃Si₂O₅(OH)₄; possibly chlorite/epidote-bearing mafic rock

Serpentinite

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

Jasper

Silicon Dioxide (Microcrystalline Quartz), SiO2

Rounded greenstone cobble

Likely altered basalt/greenstone; commonly chlorite–actinolite–epidote rich

Limonite Concretion

FeO(OH)·nH2O (Hydrated Iron Oxide)

Iron-Stained Quartz

Silicon Dioxide (SiO2) with Iron Oxide impurities

Limonite (Goethite/Ironstone)

Hydrated iron oxide-hydroxide, approximately FeO(OH)·nH2O

Quartzite Pebbles

Quartzite (primarily SiO2)

Likely raw epidote or altered amphibole crystal

Epidote, Ca₂(Al,Fe³⁺)₃(SiO₄)₃(OH); identification is tentative from the image

Jadeite (Jade)

Jadeite (NaAlSi2O6)

Tumbled green aventurine quartz

Aventurine quartz; microcrystalline SiO₂ with dispersed mica or fuchsite inclusions

Greenschist (Greenstone River Pebble)

Greenschist (Chlorite Schist)

Limonite after Marcasite (Propeller Conchoid)

Goethite/Limonite pseudomorph after Marcasite (FeO(OH)·nH2O)

Greenstone, likely chlorite-rich schist

Chlorite schist; chiefly chlorite, actinolite/amphibole, feldspar, and quartz

Weathered iron-rich rock, possibly laterite or limonite-bearing sandstone

Laterite/limonite-rich material; commonly dominated by goethite (FeO(OH)) and hydrated iron oxides

Red jasper or hematite-rich rock

Red jasper (microcrystalline quartz, SiO₂) with hematite (Fe₂O₃)

Polished tiger’s-eye

Quartz variety with fibrous crocidolite pseudomorphs; mainly SiO₂

Ferruginous Sandstone

Iron-rich Clastic Sedimentary Rock

Schist

Mica Schist (primarily Muscovite or Biotite sheet silicates)

Limonite Pseudomorph after Pyrite

Limonite (FeO(OH)·nH2O) replacing Pyrite (FeS2)

Siltstone with Iron Staining

Siltstone

Tumbled serpentine

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

Polished black slate or schist slab

Slate/schist, composed mainly of fine-grained mica, quartz, and chlorite

Polished tiger’s-eye

Quartz variety: fibrous chatoyant quartz, chiefly SiO₂, pseudomorphous after crocidolite

Greenstone (likely altered basalt or metabasalt)

Chlorite–actinolite-rich metabasalt; composition commonly dominated by chlorite, actinolite, epidote, albite, and quartz

Polished tiger’s-eye (likely blue-and-golden tiger’s-eye)

Fibrous quartz, SiO₂, pseudomorphic after crocidolite; varieties include golden tiger’s-eye and hawk’s-eye

Weathered greenstone (likely serpentinite or altered basalt)

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

Crystalline limestone (marble-like calcite rock)

Calcite, CaCO₃; likely recrystallized limestone (marble)

Greenstone

Metabasalt / Chlorite-actinolite-epidote schist

Epidosite

Epidosite (predominantly Epidote {Ca2Al2Fe3+Si3O12(OH)} and Quartz {SiO2})

Anthracite Coal

Anthracite (Carbon Content: 86%-97%)

Ruby (Corundum)

Aluminium oxide (Al2O3) with Chromium traces

Polished tiger’s-eye and jasper specimen

Quartz (SiO₂), chiefly fibrous chatoyant quartz, with iron-oxide-rich jasper/goethite

Ironstone Concretion

Siderite or Hematite Concretion (FeCO3 or Fe2O3)

Limonite Concretion (Goonie or Rattlestone)

Limonite (FeO(OH)·nH2O)

Blue Chalcedony

Cryptocrystalline Quartz (SiO2)