Sedimentary Or Metamorphic Derived

Rhodonite

Rhodonite (Mn,Fe,Mg,Ca)SiO3

Weathered mafic metamorphic rock, likely serpentinite or altered basalt

Probably serpentinized ultramafic rock; commonly dominated by serpentine-group minerals, with magnetite and altered pyroxene/olivine

Green Aventurine

Silicon Dioxide (Quartz) with Fuchsite inclusions (K(Al,Cr)2(AlSi3O10)(OH)2)

Green Aventurine

Silicon dioxide (SiO2) with inclusions of Fuchsite

Jasper

Silicon dioxide (SiO2) with impurities

Likely tumbled quartz or feldspar fragment

Quartz (SiO₂) or feldspar-group silicate

Quartz (likely Jasper or Chert variety)

Quartz (SiO₂)

Baked-clay ceramic fragment (likely brick or pottery)

Fired clay, primarily aluminosilicate minerals; not a natural rock

Calcite fragment

Calcite, calcium carbonate (CaCO₃)

Vanadinite

Vanadinite (Pb5(VO4)3Cl)

Quartz-rich vein rock, likely milky quartz with iron staining

Quartz (SiO₂), possibly quartz vein material with minor iron oxides and feldspar

Tiger’s-eye schist (likely golden amphibole-bearing schist)

Quartz–mica schist with fibrous amphibole, commonly riebeckite/crocidolite-derived material

Schist

Mica Schist (predominantly Muscovite/Biotite)

Mica Schist

Mica Schist (primarily Muscovite and Biotite KAl2(AlSi3O10)(OH)2)

Unakite

Altered Granite (Epidotized Granite)

Schist

Mica Schist

Likely serpentinite (serpentine-rich rock)

Serpentinite; chiefly serpentine-group minerals, Mg₃Si₂O₅(OH)₄, with possible magnetite, olivine, and pyroxene

Serpentine

Serpentinite (Mg, Fe, Ni, Al, Zn, Mn)2-3(Si, Al, Fe)2O5(OH)4

Mica Schist

Mica Schist (with Muscovite)

Schist

Mica Schist

Ruby in Zoisite

Anyolite (combination of Ca2Al3(SiO4)3(OH) and Al2O3:Cr)

Green Aventurine

Silicon Dioxide (SiO2) with inclusions of Fuchsite (K(Al,Cr)2(AlSi3O10)(OH)2)

Lapis Lazuli

Complex metamorphic rock primarily composed of Lazurite ((Na,Ca)8(AlSiO4)6(S,Cl,SO4,OH)2), Calcite, and Pyrite

Serpentinite

Serpentinite (composed primarily of Serpentine group minerals, Mg3Si2O5(OH)4)

Schist

Mica Schist

Ruby in Zoisite (Anyolite)

Corundum var. Ruby in Zoisite (Al2O3 + (Ca2Al3(SiO4)3(OH)))

Yellow Beryl (Heliodor)

Beryllium aluminum silicate (Be3Al2Si6O18)

Schist

Mica Schist

Quartz-rich pebble (likely milky quartz)

Quartz, silicon dioxide (SiO₂), possibly a weathered quartzite fragment

Unakite

Altered Granite

Rhodonite

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

Red Jasper (with Quartz and Chert)

Silicon Dioxide (SiO2) with Iron Oxide inclusions

Polished gemstone tower assortment

Primarily quartz varieties and simulants; apparent amethyst (SiO₂), rose quartz (SiO₂), clear quartz (SiO₂), fluorite (CaF₂), sodalite, malachite, and possibly dyed or composite stones

Rhodolite Garnet

Mg3Al2(SiO4)3 - Fe3Al2(SiO4)3 (Pyrope-Almandine series)

Serpentinite

Serpentinite (composed primarily of mineral group (Mg,Fe,Ni,Al)3Si2O5(OH)4)

Limonite after Pyrite (Prophecy Stone or Ironstone Concretion)

Goethite/Limonite pseudomorph after Pyrite/Marcasite (FeO(OH)·nH2O)

Schist

Chlorite-Mica Schist

Schist

Mica Schist (primarily Muscovite and Quartz)

Mica Schist

Mica Schist (predominantly Muscovite or Biotite sheet silicates)

Banded Gneiss

Gneiss (pronounced 'nice')

Aquamarine (Beryl)

Beryllium aluminum silicate (Be3Al2Si6O18)

Likely serpentinite or serpentinized ultramafic rock

Serpentinite; chiefly serpentine-group minerals (Mg₃Si₂O₅(OH)₄), possibly with magnetite and minor olivine/pyroxene