Sedimentary Or Metamorphic (Low Grade)

Greenstone / Epidosite

Metamorphosed Mafic Igneous Rock (Epidote-Chlorite group)

Schist (Greenschist / Mica Schist)

Foliated Metamorphic Rock (rich in chlorite, muscovite, and quartz)

Greenstone

Metabasalt / Chlorite schist

Greenstone Pebble

Metabasalt / Greenstone

Greenstone

Metabasalt

Greenstone (Diabase or Metabasalt)

Metamorphosed Mafic Igneous Rock

Aquamarine (Pendant) and Jasper (Beads)

Beryllium aluminum silicate (Be3Al2Si6O18) with Chalcedony (SiO2)

Milky quartz vein fragment

Quartz (SiO₂), likely massive or vein quartz with minor iron-oxide/clay inclusions

Rough Emerald (Beryl)

Emerald (Be3Al2(SiO3)6 with Cr/V impurities)

Ironstone Concretion / Chert Nodules

Iron-rich Sedimentary Concretion (Fe2O3 / SiO2 mix)

Siltstone

Siltstone (SiO2, Fe2O3, Al2O3 mix)

Tumbled yellow-green stone, likely serpentine or nephrite jade

Serpentine-group mineral, commonly antigorite/lizardite; possible nephrite, a tremolite–actinolite amphibole aggregate

Jasper with Epidote

Silicon Dioxide (SiO2) with Calcium Aluminum Iron Silicate Hydrate

Limonite or Ironstone Concretion

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

Limonite Concretion

Limonite (FeO(OH)·nH2O) Pseudomorph

Emerald

Beryl (Be3Al2(SiO3)6) with Chromium/Vanadium impurities

Likely tumbled greenstone (identity uncertain)

Greenstone: metamorphosed mafic volcanic rock, commonly composed of chlorite, actinolite, and epidote

Likely slate fragment

Slate; fine-grained foliated metamorphic rock composed mainly of clay minerals, quartz, and mica

Tiger's Eye

Pseudomorph of Quartz after Crocidolite (SiO2 with inclusions)

Weathered schist or phyllite

Mica schist/phyllite; quartz–mica-rich foliated metamorphic rock

Likely slate or fine-grained metamorphic rock

Slate/phyllite; predominantly fine-grained mica, chlorite, and quartz

Greenschist

Greenschist (Chlorite Schist)

Rough Garnet (Almandine)

Almandine Garnet (Fe3Al2(SiO4)3)

Greenstone (Metabalt)

Chlorite-actinolite schist (Greenstone)

Greenstone

Metamorphic Greenstone (Greenschist facies)

Jasper

Silicon Dioxide (Microcrystalline Quartz, SiO2)

Anthracite Coal

Anthracite (Carbon-rich metamorphic rock)

Greenstone / Diabase Porphyry

Porphyritic Diabase (Micro-gabbro)

Likely basaltic or mafic metamorphic rock

Fine-grained mafic rock, probably basalt or altered basalt; composition mainly plagioclase and pyroxene, possibly chlorite/epidote

Greenstone (likely chlorite-rich metamorphic rock)

Chlorite-bearing greenschist; exact identification requires testing

Epidotite

Epidotite (Epidote content > 50%)

Siderite Concretion in Shale

Iron carbonate (FeCO3) in Mudstone/Shale matrix

Stream-worn greenstone (likely serpentinite or altered basalt)

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

Serpentinite

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

Ruby (Corundum)

Corundum (Aluminum Oxide with Chromium), Al2O3:Cr

Black Beach Pebble (Basalt / Slate)

Basalt / Metamorphic Slate pebble

Green Jasper

Microcrystalline Quartz (SiO2)

Chert / Greenstone

Silicon Dioxide (SiO2) with impurities

Quartzite with Epidote

Meta-quartzite containing Epidote (Ca2(Al2,Fe)(SiO4)(Si2O7)O(OH))

Garnet Schist

Almandine Garnet in Micaceous Schist

Jadeite (Jade)

Jadeite, NaAlSi₂O₆

Epidote in Quartz

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