Sedimentary Or Metamorphic (Low Grade)

Jadeite

NaAlSi2O6; Jadeite silicate mineral

Rough Ruby (Corundum) in Zoisite Matrix

Al2O3 (Aluminum Oxide) with Ca2Al3(SiO4)3(OH)

Nephrite Jade

Ca2(Mg,Fe)5Si8O22(OH)2 (Actinolite-Tremolite series)

Porcelain Tile (Sandstone-look)

Man-made Ceramic (resembling Quartz-rich Sandstone)

Weathered basalt or mafic metavolcanic rock

Basalt, possibly altered to greenstone (chlorite–epidote–actinolite assemblage)

Almandine Garnet in Schist

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

Iron-rich laterite or weathered ironstone

Goethite–hematite-bearing limonite (FeO(OH)·nH₂O / Fe₂O₃), likely lateritic ironstone

Ironstone Pebble

Ferruginous sedimentary rock (Fe2O3 / FeO(OH) mixed with SiO2)

Ironstone (likely siderite or goethite-rich siltstone)

Ferruginous Siltstone

Serpentinite (often containing Jadeite/Nephrite)

Antigorite-rich Serpentine Rock, (Mg, Fe)3Si2O5(OH)4

Citrine (Yellow Quartz)

Silicon Dioxide (SiO2)

Greenschist (likely chlorite schist)

Greenschist-facies metamorphic rock; commonly quartz + chlorite ± actinolite, epidote, albite, and mica

Greenstone (likely altered basalt or serpentinite)

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

Greenstone / altered basalt (probable)

Chlorite–epidote–actinolite aggregate; commonly metabasalt (greenstone)

Tumbled gray stone, likely slate or fine-grained metamorphic rock

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

Epidote-rich rock (likely epidotite or altered basalt)

Epidote, Ca₂(Al,Fe³⁺)₃(SiO₄)₃(OH); possibly epidote-bearing mafic rock

Tiger’s-eye (likely red/brown variety)

Chatoyant quartz, chiefly SiO₂, pseudomorphous after crocidolite (riebeckite)

Blue-gray metamorphic rock, likely slate or phyllite

Slate/phyllite; chiefly quartz, muscovite/illite, chlorite, and minor feldspar

Anthracite Coal

Anthracite (Carbon)

Quartz with Chlorite / Greenschist

Quartz vein in Greenschist (SiO2 with Chlorite group minerals)

Green Jasper

Microcrystalline Quartz (SiO2)

Anthracite Coal

Anthracite

Likely milky quartz

Quartz (silicon dioxide, SiO₂), possibly quartz-rich rock or calcite

Milky quartz (rough quartz fragment)

Quartz, silicon dioxide (SiO₂)

Milky Quartz with Chlorite/Moss Infusions

Silicon Dioxide (SiO2)

Tumbled tiger’s-eye

Quartz variety, SiO₂, with crocidolite-derived fibrous inclusions

Serpentinite

Serpentinite (complex of Antigorite, Lizardite, and Chrysotile, Mg3Si2O5(OH)4)

Serpentinized ultramafic rock (serpentinite)

Serpentinite, dominated by serpentine-group minerals (lizardite/chrysotile/antigorite), with possible magnetite, talc, and brucite

Yellow Ochre / Limonite

Hydrated ferric oxide (FeO(OH)·nH2O)

Jadeite

Jadeite (NaAlSi2O6)

Weathered greenstone / altered rock fragment

Probable chlorite–epidote–actinolite-rich metavolcanic rock; exact identification requires testing

Shale or Slaty Mudstone

Argillaceous sedimentary rock

Greenstone (or Greywacke/Metasediment Pebble)

Metamorphosed Mafic Rock / Chlorite Schist

Gneiss (probable banded metamorphic rock)

Banded gneiss; typically quartz–feldspar–mica assemblage

White Opal

Hydrated Silica (SiO2·nH2O)

Anthracite

Anthracite (highest-grade coal)

Ironstone Concretion

Ironstone (primarily Siderite or Limonite)

Emerald

Beryl (Be3Al2Si6O18 with Chromium/Vanadium impurities)

Slate

Slate (a fine-grained, foliated metamorphic rock). Mineral composition: Primarily composed of mica minerals (muscovite, chlorite, sericite) and quartz, with minor amounts of hematite, pyrite, and other accessory minerals.

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

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

Anthracite Coal

Anthracite (Carbon-rich metamorphic rock)

Ironstone pebble

Ironstone (Ferruginous Sedimentary Rock)