Sedimentary Or Metamorphic (Low Grade)

Rounded gray-green pebble, likely basaltic or metamorphic

Indeterminate mafic rock; possibly basalt, diabase, or greenstone

Prehnite

Prehnite - Ca2Al(AlSi3O10)(OH)2

Greenstone (Greenschist)

Greenschist facies rock (containing chlorite, epidote, actinolite)

Epidote

Epidote {Ca2}{Al2Fe3+}(Si2O7)(SiO4)O(OH)

Iron-rich quartzite or ferruginous metamorphic rock

Ferruginous quartzite, likely hematite/goethite-bearing quartzite; SiO₂ with Fe₂O₃/FeO(OH)

Weathered quartz-rich rock, possibly milky quartz or quartzite

Quartz (SiO₂), potentially quartzite if metamorphic

Ruby (Raw Corundum)

Corundum (Al2O3) with Chromium traces

Gray metamorphic rock, likely slate or phyllite

Fine-grained foliated rock, probably quartz–mica slate/phyllite

Shungite

Non-crystalline carbon (high-carbon metamorphic rock)

Garnet Schist

Almandine Garnet in Mica Schist (Fe3Al2(SiO4)3)

Jadeite (Jade Ring)

NaAlSi2O6 (Sodium Aluminum Silicate)

Dark gray metamorphic pebble, likely slate or phyllite

Slate/phyllite; chiefly fine-grained quartz, mica, and clay-derived minerals

Slate with Red Sandstone Landscaping Rock

Foliated Pelitic Metamorphic Rock (Slate) and Ferruginous Sandstone

Lapis Lazuli (Low Grade)

Lapis Lazuli (Metamorphic rock containing lazurite, calcite, and pyrite)

Raw Emerald (Emerald Beryl)

Beryl (Be3Al2Si6O18) with chromium/vanadium impurities

Bornite (Peacock Ore)

Bornite (Cu5FeS4)

Jadeite

Jadeite (NaAlSi2O6)

Epidote

Epidote (Ca2(Al, Fe)3(SiO4)3(OH))

Greenschist

Chlorite schist

Iron-stained weathered rock

Unknown

Greenstone

Metamorphic Rock (Greenschist facies)

Corundum (Ruby/Sapphire crystal)

Al2O3 (Aluminum Oxide)

Serpentine

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

Tiger's Eye

Pseudomorph of Quartz after Crocidolite (SiO2 with iron oxide inclusions)

Graphitic schist (likely carbonaceous slate)

Graphite-bearing pelitic schist; mainly quartz, mica, feldspar, and graphite

Tumbled lapis lazuli

Lazurite-bearing calcite rock; lazurite approximately Na₃Ca(Si₃Al₃)O₁₂S

Green Jadeite

Jadeite, NaAl(Si2O6)

Slate or shale fragment

Slate; predominantly clay minerals, mica, and quartz (low-grade metamorphosed shale)

Greenschist

Greenschist (Chlorite-actinolite schist)

Schist

Metamorphic Schist

Pink-and-white quartz-rich pebble

Quartz (SiO₂), likely massive quartz with iron-oxide staining and possible feldspar inclusions

Polished mica-rich metamorphic sphere

Likely mica schist or garnet-mica schist; exact identification is uncertain from the photograph

Ironstone Concretion (Boxwork)

Siderite-Limonite Concretion (FeO(OH)·nH2O)

Siltstone

Siltstone (fine-grained clastic sedimentary rock)

Limonite Concretion

Goethite-rich Concretion (FeO(OH))

Red-and-black slate

Slate, a fine-grained metamorphic rock composed mainly of clay-derived mica minerals and quartz

Prehnite

Prehnite, Ca2Al(AlSi3O10)(OH)2

Likely serpentine or weathered greenstone pebble

Serpentine-group minerals, chiefly antigorite/lizardite; possibly chlorite–actinolite greenstone

Rounded blue-gray stone, likely slate or fine-grained metamorphic rock

Probable slate/phyllite; composition mainly quartz, mica, and feldspar

Pale-green schist fragment

Chlorite–sericite schist, possibly containing epidote or actinolite

Anthracite

Anthracite coal

Foliated metamorphic rock, likely slate or phyllite

Fine-grained metapelite; commonly quartz–mica–chlorite with possible graphite