Sedimentary Or Metamorphic (Low Grade)

Polished tiger’s-eye

Quartz variety: fibrous golden-brown chalcedonic quartz, SiO₂

Likely polished blue-gray stone, possibly labradorite or slate

Tentatively labradorite (plagioclase feldspar, NaAlSi₃O₈–CaAl₂Si₂O₈) or blue-gray slate; identification is limited by the close-up image

Foliated metamorphic rock (likely slate or phyllite)

Slate/phyllite; chiefly quartz, mica, and chlorite

Banded Chert or Unakite-like Rock

Epidotized Granulite or Jasperoid Chert

Onyx (Calcite Onyx / Mexican Onyx)

Calcium Carbonate (CaCO3)

Likely micaceous metamorphic rock fragment

Probable phyllite or mica schist; quartz–muscovite-rich assemblage

Greenstone

Metabasalt / Greenschist

Anthracite Coal

Anthracite

Greenstone

Metabasalt (often contains Chlorite, Actinolite, and Epidote)

Greenstone

Metamorphosed Mafic Igneous Rock

Jasper

Microcrystalline Quartz (SiO2)

Jasper

Microcrystalline Quartz (SiO2)

Quartz-rich rock fragment

Milky quartz, primarily silicon dioxide (SiO₂), possibly quartzite or a feldspar-bearing vein rock

Garnet Schist

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

Limonite stained Sandstone

Sedimentary rock with Goethite/Limonite (FeO(OH)·nH2O)

Epidote and Quartz in Basalt

Epidote [Ca2(Al2,Fe3+)(SiO4)(Si2O7)O(OH)] in Metabasalt

Epidote

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

Jadeite

NaAl(Si2O6)

Slate

Slate; predominantly fine-grained phyllosilicates (muscovite/illite, chlorite) with quartz and possible iron oxides

Siltstone

Siltstone

Greenschist (Chlorite Schist)

Greenschist (containing chlorite, actinolite, and epidote)

Epidosite (Epidote-rich rock)

Epidotalite (primarily Ca2(Al2Fe3+)(SiO4)(Si2O7)O(OH))

Polished tiger’s-eye

Quartz-rich aggregate with chatoyant fibrous crocidolite pseudomorphs; mainly SiO₂

Polished tiger’s eye

Quartz variety, SiO₂, with parallel fibrous amphibole pseudomorphs (crocidolite)

Limonite-stained Quartz / Quartzite

Silicon Dioxide (SiO2) with iron hydroxides (FeO(OH)·nH2O)

Pearl and Garnet Glass

Calcium Carbonate (CaCO3) for pearl; Silicon Dioxide (SiO2) for glass

Glauconitic Sandstone

Glauconitic Sandstone (Greensand)

Siltstone with Iron Staining

Siltstone (primarily SiO2 with Fe2O3 staining)

Green Jasper

Microcrystalline Quartz (SiO2) with inclusions

Polished greenstone pebble

Likely serpentinite or chlorite-rich greenschist

Kyanite

Kyanite (Al2SiO5)

Nephrite Jade

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

Anthracite Coal

Anthracite (Carbon based fossil fuel)

Jade (likely Nephrite Jade based on appearance)

Nephrite (a variety of actinolite, Ca2(Mg,Fe)5Si8O22(OH)2)

Greenstone (Prase / Metavolcanic)

Metamorphosed volcanic rock (Greenstone)

Weathered greenish mineral specimen, possibly serpentine or epidote

Tentatively serpentine-group mineral (Mg3Si2O5(OH)4) or epidote (Ca2(Al,Fe)3Si3O12(OH)); identification is uncertain from the image alone

Blue Chalcedony

Silicon Dioxide (SiO2)

Aragonite (Flos Ferri)

Calcium Carbonate (CaCO3)

Weathered dark metamorphic rock, likely slate or phyllite

Fine-grained foliated rock, probably slate/phyllite; exact identification requires testing

Green Quartzite (Aventurine type)

Quartzite (principally Quartz, SiO2) with inclusions of Fuchsite

Serpentine

Antigorite-Lizardite-Chrysotile (Mg3Si2O5(OH)4)

Polished Stone Pendant (Identity Unclear)

Unknown (Possibly Jasper/Agate/Quartz mixture)