Sedimentary Or Metamorphic (Low Grade)

Quartz-bearing greenstone (probable epidote–quartz rock)

Epidote–quartz schist/greenstone; chiefly quartz (SiO₂) and epidote [Ca₂(Al,Fe)₃(SiO₄)₃(OH)], with possible chlorite and feldspar

Greenstone (Epidosite/Altered Diorite)

Metabasalt or Meta-andesite / Epidotized Diorite

Greenstone / Metabasalt

Chlorite schist or Epidiorite

Greenstone

Metamorphic mafic rock (chlorite-actinolite-epidote schist)

Yellow Jade (Nephrite or Quartzite)

Nephrite (Ca2(Mg,Fe)5Si8O22(OH)2) or Jade-colored Quartzite (SiO2)

Yellow Jade

Nephrite (Ca2(Mg, Fe)5Si8O22(OH)2) or Jadeite (NaAlSi2O6)

Pyrite (Fool's Gold)

Iron Sulfide (FeS2)

Iron-rich quartzite or ferruginous metamorphic rock

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

Greenschist

Greenschist (comprising Actinolite, Chlorite, and Epidote)

Greenschist (Greenstone)

Greenschist

Weathered mica-rich metamorphic rock

Likely schist or phyllite; composition probably quartz, mica, and feldspar

Gray metamorphic rock, likely slate or phyllite

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

Jadeite

Jadeite (NaAlSi2O6)

Porphyritic Andesite or Basalt

Porphyritic Intermediate/Mafic Igneous Rock

Limonite

FeO(OH)·nH2O

Phyllite (possibly low-grade greenish slate)

Foliated metamorphic rock composed mainly of very fine-grained quartz, mica, and chlorite; approximate composition varies and has no single fixed chemical formula

Epidote in Matrix (Unakite-related)

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

Heliotrope (Bloodstone)

Cryptocrystalline Quartz (SiO2) with inclusions of Hematite (Fe2O3)

Ruby (Raw Corundum)

Corundum (Al2O3) with Chromium traces

Bornite (Peacock Ore)

Bornite (Cu5FeS4)

White Opal

Hydrated Silica (SiO2·nH2O)

Shungite

Non-crystalline carbon (high-carbon metamorphic rock)

Banded gneiss

Gneiss, commonly quartz–feldspar–mica gneiss

Epidote

Epidote - Ca2(Al2,Fe3+)3(SiO4)3(OH)

Greenstone

Metamorphic Rock (Greenschist facies)

Carnelian

Silicon Dioxide (Chalcedony variety), SiO2

Slate with Red Sandstone Landscaping Rock

Foliated Pelitic Metamorphic Rock (Slate) and Ferruginous Sandstone

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

Greenstone pebble (identification uncertain from photo)

Greenstone, typically metamorphosed mafic rock composed of chlorite, actinolite, and epidote

Weathered quartz-rich rock, possibly milky quartz or quartzite

Quartz (SiO₂), potentially quartzite if metamorphic

Greenstone (Greenschist)

Greenschist facies rock (containing chlorite, epidote, actinolite)

Green Jade

Nephrite (Ca2(Mg,Fe)5Si8O22(OH)2) or Jadeite (NaAlSi2O6)

Nephrite Jade

Ca2(Mg,Fe)5Si8O22(OH)2

Limonite

FeO(OH)•nH2O

Rounded gray-green pebble, likely basaltic or metamorphic

Indeterminate mafic rock; possibly basalt, diabase, or greenstone

Prehnite

Prehnite - Ca2Al(AlSi3O10)(OH)2

Fine-grained gray-green rock, possibly slate or phyllite

Indeterminate from the image; likely low-grade metamorphosed mudstone (slate/phyllite)

Schist

Metamorphic Schist

Greenstone (likely chlorite-rich metamorphic rock)

Chlorite-bearing greenschist; exact identification requires testing

Tiger's Eye

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

Raw Emerald (Emerald Beryl)

Beryl (Be3Al2Si6O18) with chromium/vanadium impurities