Metamorphic (Likely Gneiss Or Schist Based On Texture)

Mica Schist with Quartz

Mica Schist (primarily Muscovite or Biotite sheet silicates)

Muscovite Mica

Muscovite - KAl2(AlSi3O10)(OH)2

Mica Schist

Mica Schist (Quartz-Mica Metamorphic Rock)

Gneiss

High-grade metamorphic rock (Gneiss)

Weathered green-gray stone, likely serpentinite or chlorite-rich metamorphic rock

Probable serpentinite (antigorite–lizardite), possibly chlorite schist or altered basalt

Greenstone

Protolith of basalt/gabbro (chlorite-epidote metamorphic facies)

River-worn Quartzite / Soapstone

Metamorphic Rock (Quartzite/Talc-schist)

Gneiss

Gneiss

Gneiss

Gneiss (High-grade Regional Metamorphic Rock)

Schist

Mica Schist

Granite Gneiss

Gneiss (Derived from Granite protolith)

Gneiss

Gneiss (High-grade regional metamorphic rock)

Conglomerate

Conglomerate (clastic sedimentary rock)

Granitoid (Granite/Gneiss mix)

Granite or Granitic Gneiss (Silicon dioxide SiO2 with Al, K, Na silicates)

Iron-stained quartz vein rock

Milky quartz (SiO₂) with limonite/goethite iron oxides, possibly in altered host rock

Gneiss

Gneiss

Porphyritic granite or granitic gneiss

Quartz–feldspar–mica granitoid; exact identification requires testing

Greenstone (Metabaltic/Greenschist)

Chlorite schist / Meta-basalt

Banded Gneiss

Gneiss (High-grade Regional Metamorphic Rock)

Gneiss

High-grade Metamorphic Gneiss

Rough Emerald (Beryl)

Emerald (Be3Al2(SiO3)6 with Cr/V impurities)

Granite (likely biotite granite)

Coarse-grained felsic plutonic rock: quartz + feldspar + biotite; approximate composition SiO₂-rich

Fuchsite (Green Muscovite)

K(Al,Cr)2(AlSi3O10)(OH)2

Schist (Greenschist / Mica Schist)

Metamorphic rock rich in platy minerals (e.g., Chlorite/Mica schist)

Greenschist (containing Epidote and Quartz)

Greenschist (Epidote-Chlorite-Actinolite Schist)

Muscovite Schist

Muscovite Mica Schist (KAl2(AlSi3O10)(OH)2)

Greenschist

Greenschist (Chlorite-Epidote-Actinolite Schist)

Tumbled quartz-rich stone, possibly blue quartz or granite

Quartz (SiO₂), with probable feldspar and dark accessory minerals

Biotite-rich granite or granitic gneiss

Granite, chiefly quartz + feldspar + biotite mica; possibly weakly gneissic

Quartz (likely a weathered/tumbled piece)

Quartz (SiO₂)

Gneiss (Granitic Gneiss)

Gneiss

Quartz vein in Schist

Crystalline Silicon Dioxide (SiO2) in Metamorphic Host

Gneiss

Gneiss

Gneiss

Gneiss

Mixed Gemstone Collection

SiO2 (Quartz varieties) and Biogenic CaCO3 (Nacre)

Gneiss

Gneiss

Banded Gneiss

Gneiss (High-grade Metamorphic Rock)

Green Aventurine

Aventurine Quartz (SiO2 with Fuchsite inclusions)

Mica Schist (with Muscovite mica)

Mica Schist (KAl2(AlSi3O10)(OH)2)

Gneiss

Gneiss (Metamorphic rock composed primarily of Quartz, Feldspar, and Mica/Amphibole)

Gneiss (Banded Gneiss)

Gneiss

Small brown-gray mineral fragment

Indeterminate; possibly weathered quartz-, feldspar-, or iron-oxide-bearing rock