Rock crystal quartz fragment
Quartz (silicon dioxide, SiO₂)
mineral
Category
Igneous, Metamorphic, Sedimentary
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Banded Gneiss
Gneiss (Metamorphic Rock)
metamorphic
Sugilite
KNa2(Fe,Mn,Al)2Li3Si12O30
mineral
Blue Apatite
Fluorapatite (Ca5(PO4)3F)
mineral
Banded Gneiss
Gneiss (High-grade regional metamorphic rock)
metamorphic
Mixed River Stones and Minerals
Mixed Silica-rich Stones (Quartz, Agate, Jasper, Sandstone, Dalmation Stone)
sedimentary
Tourmaline (likely Schorl)
Tourmaline Group Mineral (e.g., Schorl for black varieties); (Na,Ca)(Li,Mg,Fe,Mn,Al)3Al6(BO3)3Si6O18(OH)4
Mineral
Gneiss with Quartz Veining
Gneiss (High-grade regional metamorphic rock)
metamorphic
Quartz
Quartz (SiO₂)
Mineral
Quartz Pebble
Silicon Dioxide (SiO2)
sedimentary
Sunstone / Peach Moonstone (Feldspar variety)
Potassium Aluminum Silicate (KAlSi3O8)
mineral
Quartz–feldspar–mica metamorphic rock, likely gneiss
Gneiss; composition commonly quartz (SiO₂), feldspars, biotite/hornblende, and minor accessory minerals
metamorphic
Sunstone and Garnet
Plagioclase Feldspar ((Na,Ca)(Al,Si)4O8) and Almandine Garnet (Fe3Al2(SiO4)3)
gemstone
Gneiss
Gneiss
metamorphic
Gneiss
Metamorphic Gneiss (High-grade regional metamorphism)
metamorphic
Banded Gneiss with Quartz Vein
Gneiss containing SiO2 (Quartz) intrusion
metamorphic
Gneiss (High-grade Metamorphic Rock)
Gneiss
metamorphic
Gneiss
Gneiss (High-grade Regional Metamorphic Rock)
metamorphic
Gneiss
High-grade regional metamorphic Gneiss
metamorphic
Banded Gneiss
Gneiss (High-grade regional metamorphic rock)
metamorphic
Gneiss
Gneiss
metamorphic
Biotite Schist
Biotite-rich Schist (K(Mg,Fe)3AlSi3O10(OH,F)2)
metamorphic
Gneiss (Metamorphosed Pebble)
Gneiss with Quartz/Feldspar banding
metamorphic
Granite Gneiss
Gneiss (Polymetamorphic Quartz-Feldspar-Mica rock)
metamorphic
Banded Gneiss
Gneiss (High-grade regional metamorphic rock)
metamorphic
Gneiss
Gneiss (High-grade Metamorphic Rock)
metamorphic
Gneiss
Gneiss
metamorphic
Gneiss
Gneiss (Foliated Metamorphic Rock)
metamorphic
Gneiss (High-grade Metamorphic Rock)
Gneiss (Metamorphic silicate rock)
metamorphic
Almandine Garnet
Almandine, Fe3Al2(SiO4)3
mineral
Banded Gneiss River Pebble
Gneiss
metamorphic
Gneiss (Metamorphic Rock Pebble)
Foliated Metamorphic Rock (Quartz-Feldspar Gneiss / Granitic Gneiss)
metamorphic
Gneiss
Gneiss
metamorphic
Gneiss
Gneiss
metamorphic
Banded Gneiss
Gneiss (High-grade regional metamorphic rock)
metamorphic
Gneiss (Cobble)
Gneiss
metamorphic
Gneiss (with Quartz-Feldspar vein)
Gneiss (high-grade metamorphic rock) containing Quartz (SiO2) and Feldspar (KAlSi3O8 – NaAlSi3O8 – CaAl2Si2O8)
metamorphic
Gneiss
Gneiss (High-grade regional metamorphic rock)
metamorphic
Gneiss
Gneiss
metamorphic
Gneiss
Gneiss (High-grade Metamorphic Rock)
metamorphic
Banded Gneiss
Gneiss (High-grade Regional Metamorphic Rock)
metamorphic
Gneiss
Gneiss (High-grade Regional Metamorphic Rock)
metamorphic