Sedimentary Or Metamorphic (Low Grade)

Weathered greenish-gray rock fragment, likely serpentinite or chlorite-rich metamorphic rock

Tentative identification: serpentinite (serpentine-group minerals) or chlorite-bearing metamorphic rock; image alone cannot distinguish them reliably

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)

Likely basaltic or mafic metamorphic rock

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

Ironstone Concretion / Chert Nodules

Iron-rich Sedimentary Concretion (Fe2O3 / SiO2 mix)

Opal

Hydrated amorphous silica (SiO2·nH2O)

Stream-worn greenstone (likely serpentinite or altered basalt)

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

Emerald

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

Siltstone

Siltstone (SiO2, Fe2O3, Al2O3 mix)

Limonite

FeO(OH)·nH2O

Anthracite Coal

Anthracite (Carbon-rich metamorphic rock)

Jasper with Epidote

Silicon Dioxide (SiO2) with Calcium Aluminum Iron Silicate Hydrate

Milky quartz vein fragment

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

Pyrite-bearing dark shale or slate

Fine-grained carbonaceous shale/slate with disseminated pyrite (FeS₂); exact host rock is uncertain from the photo

Rough Garnet (Almandine)

Almandine Garnet (Fe3Al2(SiO4)3)

Jasper

Silicon Dioxide (Microcrystalline Quartz, SiO2)

Limonite or Ironstone Concretion

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

Limonite Concretion

Limonite (FeO(OH)·nH2O) Pseudomorph

Siderite Concretion in Shale

Iron carbonate (FeCO3) in Mudstone/Shale matrix

Greenstone (Metabalt)

Chlorite-actinolite schist (Greenstone)

Black Beach Pebble (Basalt / Slate)

Basalt / Metamorphic Slate pebble

Greenstone

Metamorphic Greenstone (Greenschist facies)

Tumbled yellow-green stone, likely serpentine or nephrite jade

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

Kyanite

Kyanite (Al2SiO5)

Green Jasper

Microcrystalline Quartz (SiO2)

Chert / Greenstone

Silicon Dioxide (SiO2) with impurities

Likely chlorite schist

Chlorite-rich schist; chiefly chlorite with possible quartz and mica

Greenstone (likely chlorite-rich metamorphic rock)

Chlorite-bearing greenschist; exact identification requires testing

Epidotite

Epidotite (Epidote content > 50%)

Garnet Schist

Almandine Garnet Schist (Fe3Al2(SiO4)3 in Schistose matrix)

Greenstone / Diabase Porphyry

Porphyritic Diabase (Micro-gabbro)

Conglomerate

Clastic Sedimentary Rock

Iron-stained weathered rock

Unknown

Quartzite with Epidote

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

Ruby (Corundum)

Corundum (Aluminum Oxide with Chromium), Al2O3:Cr

Coal (Bituminous / Anthracite)

Organic Sedimentary Rock (Carbonaceous Rock)

Tumbled greenstone pebble

Greenstone (metamorphosed mafic volcanic rock; commonly chlorite, actinolite, epidote, and albite)

Likely greenstone (metamorphosed mafic rock)

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