Metamorphic (Low Grade)

Anthracite Coal

Anthracite

Quartz-rich pale rock fragment

Likely milky quartz (SiO₂), possibly quartzite

Milky quartz-rich rock

Quartz, crystalline silica (SiO₂), likely massive milky quartz with minor feldspar or mica

Jadeite Ring

Jadeite (NaAlSi2O6)

Weathered gray-green basaltic rock

Basalt, likely altered to low-grade greenschist/amphibolite facies

Faceted Gemstones (Mixed)

Various (e.g., Corundum, Beryl, Quartz, or synthetic equivalents)

Likely calcite-rich limestone or marble fragment

Calcite (CaCO₃), probably micritic limestone; exact identification requires testing

Weathered gray-green metamorphic pebble

Probable greenschist or chlorite-rich metavolcanic rock; exact identification requires testing

Tumbled jadeite or nephrite jade bead bracelet

Jade: jadeite (NaAlSi₂O₆) or nephrite, a tremolite–actinolite amphibole aggregate

Weathered quartz-rich pebble

Milky quartz, likely with iron-oxide staining; exact rock type uncertain from image

Milky quartz

Quartz (silicon dioxide, SiO₂)

Serpentinite

Serpentinite (composed mainly of Group: Serpentine; (Mg,Fe,Ni,Al,Zn,Mn)2-3(Si,Al,Fe)2O5(OH)4)

Slate

Foliated Metamorphic Rock (primarily composed of Muscovite, Chlorite, and Quartz)

Emerald in Matrix

Beryl (Be3Al2Si6O18) with Chromium/Vanadium impurities

Jadeite Jade

NaAlSi2O6 (Sodium Aluminum Silicate)

Nephrite Jade

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

Tumbled greenstone (likely serpentine)

Serpentinite; chiefly serpentine-group minerals, Mg₃Si₂O₅(OH)₄

Tumbled serpentine

Serpentinite; chiefly antigorite, lizardite, and chrysotile Mg₃Si₂O₅(OH)₄

Greenschist with Quartz Veining

Greenschist (commonly containing Chlorite, Actinolite, and Epidote)

Epidote

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

Tumbled Tiger’s Eye

Quartz variety, fibrous SiO₂ with crocidolite pseudomorphs

Lavender Jade and Snowy Quartz (Druzy)

NaAlSi2O6 (Jadeite) / SiO2 (Quartz)

Small quartz-rich stone, possibly iron-stained quartz or jasper

Quartz (SiO₂), potentially with iron-oxide inclusions

Likely quartz-rich rock fragment

Quartz (SiO₂), possibly iron-stained quartz or quartzite

Milky Quartz

Silicon Dioxide (SiO2)

Emerald in Matrix

Beryl (Be3Al2Si6O18) with trace amounts of Chromium/Vanadium

Rough Ruby

Corundum (Al2O3 with Chromium impurities)

Anthracite Coal

Anthracite (Carbon-rich metamorphic coal)

Green Chert

Microcrystalline Quartz (SiO2)

Fossiliferous Limestone / Fossil Fragment

Calcium Carbonate (CaCO3) with indeterminate biogenic remains

Quartz (specifically Milky Quartz or Quartzite)

Silicon Dioxide (SiO2)

Prehnite

Ca2Al(AlSi3O10)(OH)2

Dark gray metamorphic cobble, likely slate or phyllite

Foliated metapelite; possibly slate/phyllite composed mainly of quartz, mica, and chlorite

Weathered gray metamorphic rock, likely slate or phyllite

Foliated metapelite; commonly muscovite–quartz–chlorite, possibly with iron-oxide staining

Weathered quartz-rich rock, possibly quartzite or iron-stained quartz

Quartz (SiO₂), likely in a quartzite matrix with iron-oxide staining

Weathered quartz-rich rock, possibly quartzite

Quartzite (mostly microcrystalline SiO₂), tentative identification

Possible hematite- or magnetite-rich rock

Likely iron oxide, chiefly hematite (Fe₂O₃) and/or magnetite (Fe₃O₄); exact identification requires testing

Serpentinized ultramafic rock (serpentinite)

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

Aquamarine

Beryl (Be3Al2Si6O18 with iron impurities)

Jadeite Jade

NaAlSi2O6 (Sodium Aluminum Silicate)

Iolite (Cordierite)

Magnesium Iron Aluminum Silicate (Mg,Fe)2Al4Si5O18

Pyrite

Iron Sulfide (FeS2)