Metamorphic Or Sedimentary Depending On Local Grade

Dragon Blood Jasper (Dragon Stone)

Epidote-Piemontite/Quartzite Rock

Greenstone / Greenschist

Greenschist facies metamorphic rock (composed primarily of chlorite, actinolite, and epidote)

Greenstone (likely chlorite-rich greenschist)

Greenschist facies metamorphic rock, typically composed of chlorite, actinolite, and albite; exact identification requires testing

Sapphire in a ring

Corundum (Al2O3)

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

Tumbled cream-colored stone, likely quartzite or limestone

Probably quartzite (microcrystalline SiO₂); limestone alternative: calcite (CaCO₃)

Flint / Chert Arrowhead

Microcrystalline Quartz (SiO2)

Phyllite

Phyllite

Likely slate

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

Likely slate or fine-grained metamorphic rock

Slate–phyllite spectrum; commonly quartz, mica, and chlorite

Quartz

Silicon Dioxide (SiO2)

Almandine Garnet in Schist

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

Rhodonite

Manganese Silicate (Mn,Fe,Mg,Ca)SiO3

Greenstone, possibly serpentine or altered basalt

Serpentinite (Mg₃Si₂O₅(OH)₄) or chlorite-epidote altered basalt; identification is uncertain from the image

Quartz Crystal Cluster

Silicon Dioxide (SiO2)

Tumbled greenstone, likely serpentine or altered basalt

Probable serpentinite (Mg-rich phyllosilicates, chiefly antigorite/lizardite) or chlorite-rich basalt

Mica schist

Schist (rich in Muscovite or Biotite mica)

Water-worn quartzite or sandstone cobble

Quartzite (predominantly SiO₂), possibly quartz-rich sandstone

Greenstone pebble (identification uncertain from photo)

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

Unidentified greenish-gray rock fragment

Tentatively altered basalt or basaltic volcanic rock; mineral identification requires testing

Greenstone (likely altered basalt or serpentinite)

Chlorite–epidote amphibolite/greenschist or serpentinite; exact identification requires testing

Sandstone

Arenite (Sedimentary rock composed of sand-sized grains)

Gold Ore in Quartz

Native Gold (Au) in Quartz (SiO2)

Travertine

Travertine (a terrestrial form of Limestone, CaCO3)

Foliated metamorphic rock (likely phyllite or fine-grained schist)

Phyllite–schist, chiefly quartz, mica, and clay-derived silicates

Rounded dark metamorphic cobble, likely amphibolite or hornblende-rich schist

Amphibolite; principally amphibole (hornblende) and plagioclase feldspar

Schist

Mica Schist (variety: Muscovite/Biotite Schist)

Tumbled white quartz (likely milky quartz)

Quartz, silicon dioxide (SiO₂)

Tumbled carnelian/chalcedony (probable)

Microcrystalline quartz, SiO₂; orange-red variety commonly called carnelian

Tumbled blue-gray stone, likely quartzite or chalcedony

Quartz-rich rock; predominantly microcrystalline or granular SiO₂, identification uncertain from image

Biotite mica schist

Mica schist dominated by biotite (K(Mg,Fe)₃AlSi₃O₁₀(F,OH)₂), with quartz and feldspar

Greenstone, likely chlorite-rich schist

Chlorite schist; chiefly chlorite, actinolite/amphibole, feldspar, and quartz

Unidentified small mineral specimen

Indeterminate from the photograph; it may be a light-colored quartz- or feldspar-rich rock with a dark mineral inclusion.

Weathered slate or phyllite

Foliated metamorphic rock, commonly quartz–mica–chlorite assemblage

Ironstone Concretion (Limonite/Goethite)

Ironstone (composed primarily of Goethite FeO(OH) and Limonite)

Red garnet (possible almandine or pyrope), cut/polished

Garnet-group silicate; likely almandine, Fe₃Al₂(SiO₄)₃, or pyrope, Mg₃Al₂(SiO₄)₃

Epidote in Granite Gneiss

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

Greenstone (likely greenschist)

Chlorite–actinolite–epidote-rich metabasalt; mineral proportions cannot be confirmed from the photo

Greenschist / Serpentinite Cobble

Greenschist (composed primarily of chlorite, actinolite, and epidote)

Banded Iron Formation (BIF) / Tiger Iron

Ferruginous Chert (primarily Quartz [SiO2] and Hematite/Magnetite [Fe2O3/Fe3O4])

Fossiliferous Kalkstein (Marl/Sandstone)

Fossiliferous calcarenite/siltstone

Likely granite or granitic gneiss

Coarse quartz–feldspar–mica rock; if gneissic, metamorphosed granitoid