Rough Dark Green Sapphire
Corundum (Al2O3)
mineral
Category
Mineral With Metamorphic Or Igneous Host
Browse mineral with metamorphic or igneous host specimens identified by the Rock Identifier community.
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Raw quartz (milky quartz)
Quartz, silicon dioxide (SiO₂)
mineral
Tumbled yellow quartz (likely iron-stained quartz)
Quartz, silicon dioxide (SiO₂), with iron-oxide staining and possible minor inclusions
mineral
Amethyst
Amethyst (Silicon Dioxide, SiO2)
mineral
Milky quartz
Quartz (silicon dioxide, SiO₂)
mineral
Blue Sapphire
Corundum (Al2O3)
mineral
Clear Quartz Cluster
Crystalline Silicon Dioxide (SiO2)
mineral
Quartz vein in iron-stained host rock
Quartz (SiO₂) with limonite/goethite staining, likely in altered basalt or another dark volcanic host
mineral
Yellow Aventurine
Quartz (SiO2) with inclusions
mineral
Fossil gastropod in granite-like stone
Gastropoda indet.; enclosing rock likely polished granite or gneiss
fossil
Raw Emerald (Emerald Beryl)
Beryl (Be3Al2Si6O18) with chromium/vanadium impurities
mineral
Emerald
Beryl (Be3Al2(SiO3)6)
gemstone
Orange Calcite
Calcite (CaCO3)
Mineral
Wishing Stone (Quartz-veined Metamorphic/Sedimentary Rock)
Quartz Vein in Greywacke/Slate (SiO2 in host rock)
metamorphic
Greenstone
Greenschist / Meta-basalt
metamorphic
Quartz with Mafic/Chlorite Veins
Silicon Dioxide (SiO2) with Chlorite/Epidote cross-veining
metamorphic
Veined Grey Metamorphic Pebble
Quartzo-feldspathic vein in Metabasalt / Serpentinite / Slate
metamorphic
Green Tourmaline (Verdelite)
Tourmaline Group; often Elbaite (Na(Li,Al)3Al6(BO3)3Si6O18(OH)4) or Dravite (NaMg3Al6(BO3)3Si6O18(OH)4)
Mineral
Amethyst Quartz
SiO2 (Silicon Dioxide)
Mineral
Quartz Vein in Hematitic Siltstone
Hydrothermal Quartz (SiO2) in Ferriferous Matrix
metamorphic
Quartz in Greenstone
Metamorphic rock with quartz vein (SiO2 / mixed silicates)
metamorphic
Iron-stained quartz pebble
Quartz (SiO₂), likely microcrystalline or massive quartz with goethite/limonite staining
mineral
Aventurine
Quartz (Aventurine variety)
Mineral
Milky quartz vein rock
Quartz-rich hydrothermal vein; primarily quartz (SiO₂), with minor iron oxides and possibly feldspar or mica
igneous
Quartz-rich metamorphic rock, likely quartzite or vein quartz
Quartzite; predominantly microcrystalline quartz (SiO₂), possibly with mica and feldspar
metamorphic
Quartz with Mica / Chlorite Inclusion
Silicon Dioxide (SiO2) with Phyllosilicate minerals
metamorphic
Yellow Sapphire
Corundum (Al2O3)
mineral
Quartz-veined Metamorphic Rock
Quartz Vein in Phyllite or Schist (SiO2 in Silicate Matrix)
metamorphic
Milky Quartz with Iron Staining
Silicon Dioxide (SiO2)
mineral
Quartz Crystal Cluster
Quartz (Silicon Dioxide, SiO2)
mineral
Almandine Garnet
Iron aluminum silicate (Fe3Al2(SiO4)3)
Mineral
Gold Nugget
Native Gold (Au)
mineral
Likely pyrite-bearing metamorphic rock
Quartz–mica schist or gneiss with disseminated pyrite (FeS₂)
metamorphic
Red glass-like crystal, likely synthetic ruby or red glass
Uncertain from image; possible corundum (ruby), Al₂O₃, or synthetic glass
gemstone
Green Quartz / Prasiolite
Silicon Dioxide (SiO2)
mineral
Yellow Sapphire
Corundum (Al2O3:Fe)
gemstone
Quartz Vein in Matrix (Gneiss/Schist)
Silicon Dioxide (SiO2) in Metamorphic Rock Matrix
metamorphic
Fluorite with Quartz coating
Calcium Fluoride (CaF2) with Silicon Dioxide (SiO2)
mineral
Serpentinite
Serpentine-group minerals, chiefly antigorite, lizardite, and chrysotile; approximate formula Mg3Si2O5(OH)4
metamorphic
Garnet-bearing metamorphic rock, likely garnet gneiss or garnet amphibolite
Garnet-bearing gneiss; red crystals likely almandine garnet, Fe₃Al₂(SiO₄)₃
metamorphic
Polished garnet cabochon (likely almandine)
Almandine garnet, Fe₃Al₂(SiO₄)₃ (tentative identification)
gemstone
Quartz-veined Metamorphic Rock (Wishing Stone)
Quartz-veined Metamorphic/Igneous Host Rock with Quartz Veinlets
metamorphic