Metamorphic (Altered Igneous Rock)

Nuummite

Nuummite (Orthoamphibole rock composed of Anthophyllite and Gedrite, (Mg,Fe)7Si8O22(OH)2)

Banded Gneiss

Gneiss

Gneiss (specifically a weathered or stream-worn specimen)

Gneiss (Foliated Metamorphic Rock)

Feldspar

Potassium Feldspar (KAlSi3O8)

Clear Quartz

Silicon Dioxide (SiO2)

Greenstone

Metabasalt / Greenschist facies rock

Gneiss

High-grade foliated metamorphic rock

Granite Gneiss with Garnet

Garnetiferous Gneiss

Turquoise

Hydrated phosphate of copper and aluminium (CuAl6(PO4)4(OH)8·4H2O)

Clear Quartz

Silicon Dioxide (SiO2)

Gneiss

Gneiss (High-grade regional metamorphic rock)

Quartz (likely a form of massive or vein quartz)

Quartz (SiO₂)

Clear Quartz (Rock Crystal)

Silicon Dioxide (SiO2)

Tiger's Eye

Silicon dioxide (SiO2) with fibrous inclusions of crocidolite (riebeckite) that have been altered to limonite and then replaced by quartz

Greenschist (Greenstone)

Chlorite Schist / Greenschist Facies Rock

Biotite Mica

Biotite (K(Mg,Fe)3AlSi3O10(OH,F)2)

Blue Sapphire

Corundum (Al2O3)

Quartz Pebble

Silicon Dioxide (SiO2)

sedimentary

Garnet Gneiss

Gneiss containing almandine-pyrope garnet

Clear Quartz (Rock Crystal)

Silicon Dioxide (SiO2)

Biotite Mica

K(Mg,Fe2+)3(Al,Fe3+)Si3O10(OH,F)2

Clear Quartz

Silicon Dioxide (SiO2) / Rock Crystal

Mica Schist

Mica Schist (primarily Muscovite or Biotite)

Granite Gneiss

Felsic Gneiss

Milky Quartz

Silicon Dioxide (SiO2)

Serpentine

Serpentine Group (primarily Antigorite or Lizardite), Mg3Si2O5(OH)4

Gneiss

Foliated Metamorphic Gneiss

Quartz (Milky/Common)

Quartz (Silicon Dioxide, SiO2)

Sedimentary Rock (possibly conglomerate or breccia with a quartz vein)

Veined Pebble (likely a Quartz-Veined Pebble)

Pebble with Mineral Vein (e.g., Quartz Vein in a Chert/Mudstone Pebble)

Banded Gneiss

Gneiss (High-grade metamorphic rock)

Milky Quartz Vein in Host Rock

Silicon Dioxide (SiO2)

Greenschist (containing Epidote and Quartz)

Greenschist (Epidote-Chlorite-Actinolite Schist)

Banded Gneiss

Gneiss (High-grade regional metamorphic rock)

Greenstone

Greenschist-facies basaltic rock

Gneiss

Jasper

Silicon dioxide (SiO2)

sedimentary

Feldspathic Gneiss (Granite Gneiss)

Gneiss (High-grade Regional Metamorphic Rock)

Rough Star Sapphire (Corundum)

Al2O3 (Aluminum Oxide)

Gneiss

Gneiss (High-grade metamorphic rock)

Gneiss (specifically Banded Gneiss)

Gneiss