Chalcedony (or a variety of Chalcedony, likely Agate or Jasper)
Chalcedony (SiO₂)
Mineral (or mineraloid if microcrystalline)
Category
Metamorphic (Man Made)
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Grey Agate (Banded Chalcedony)
Agate (Silicon Dioxide - SiO2)
mineral
Blue Quartzite (likely dyed)
Silicon dioxide (SiO2) with likely color treatment
metamorphic
Gneiss
Gneiss
metamorphic
Schist
Schist
metamorphic
Granite Gneiss
Felsic Gneiss (composed of Quartz, Feldspar, and Biotite)
metamorphic
Magnetite-rich iron ore
Magnetite (Fe₃O₄), possibly with hematite and silicate matrix
mineral
Citrine Quartz
Silicon Dioxide (SiO2)
mineral
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Amethyst
Amethyst (Silicon Dioxide - SiO2 with iron impurities)
mineral
Milky quartz cluster
Quartz (silicon dioxide, SiO₂), likely druzy or microcrystalline quartz
mineral
Clear Quartz
Silicon Dioxide (SiO2)
mineral
Citrine
Silicon Dioxide (SiO2)
mineral
Gneiss
Gneiss (a rock type, not a specific mineral with a formula)
Metamorphic Rock
Yellow Quartz (Citrine/Lemon Quartz)
Silicon Dioxide (SiO2)
mineral
BROWN GRANITE (likely 'Tan Brown' or similar)
Granite (specifically a variety rich in orthoclase feldspar, often with biotite and possibly hornblende)
igneous
Granite (weathered pebble)
Granite (plutonic igneous rock)
Igneous
Polished serpentine or green jasper pebble
Likely serpentine-group silicate, chiefly antigorite/lizardite; possibly iron-rich jasper
mineral
Quartzite
Quartzite (primarily SiO2)
metamorphic
Greenstone
Greenschist
metamorphic
Greenstone
Metabasalt (Greenstone facies)
metamorphic
Greenstone (Greenschist)
Greenschist (composed of Chlorite, Epidote, and Actinolite)
metamorphic
Unakite
Epidotized Granite
metamorphic
Greenstone
Greenschist (metamorphosed mafic igneous rock)
metamorphic
Dark mafic metamorphic rock, likely amphibolite
Amphibolite; chiefly hornblende amphibole and plagioclase feldspar
metamorphic
Serpentine-rich metamorphic stone
Serpentinite, chiefly serpentine-group minerals (antigorite, lizardite, or chrysotile) with possible quartz, magnesite, and magnetite
metamorphic
Serpentine pendant
Serpentinite; chiefly antigorite, lizardite, or chrysotile Mg₃Si₂O₅(OH)₄
metamorphic
Serpentinite
Serpentinite (Mg, Fe, Ni, Al, Zn, Mn)3(Si, Al, Fe)2O5(OH)4
metamorphic
Greenstone (likely serpentinite or greenstone pebble)
Serpentinite-rich ultramafic rock; commonly dominated by serpentine-group minerals, with possible chlorite, actinolite, or magnetite
metamorphic
Milky quartz with iron-oxide staining
Quartz (SiO₂), likely ferruginous milky quartz
mineral
Likely citrine pendant
Quartz, silicon dioxide (SiO₂), probably heat-treated amethyst or smoky quartz
gemstone
Quartz
Quartz (Silicon Dioxide, SiO2)
Mineral
Quartzite River Rock
Quartzite (SiO2)
metamorphic
Muscovite Schist
KAl2(AlSi3O10)(OH)2 (Muscovite) in Schist Matrix
metamorphic
Granitic Gneiss
Gneiss (High-grade Metamorphic Rock)
metamorphic
Quartz (likely a weathered/tumbled piece)
Quartz (SiO₂)
Mineral
Quartz-rich gneiss
Banded quartz–feldspar–mica gneiss; commonly containing biotite and muscovite
metamorphic
Granite (likely weathered granite or granitic gneiss)
Granite; mainly quartz (SiO₂), feldspar, and mica
igneous
Greenstone
Protolith of basalt/gabbro (chlorite-epidote metamorphic facies)
metamorphic
Quartzite
Quartzite (Primary mineral: Quartz, SiO2)
metamorphic
Gneiss with Iron Staining and Sulfide Mineralization
Metamorphic Gneiss / Amphibolite with Iron/Sulfide Oxidation
metamorphic
Quartzite Pebble (River Rock)
Quartzite (primarily SiO2)
metamorphic