Ruby
Corundum (Al2O3 with Chromium traces)
mineral
Category
Metamorphic (Likely Gneiss Or Schist Based On Texture)
Browse metamorphic (likely gneiss or schist based on texture) specimens identified by the Rock Identifier community.
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Quartzite River Cobble
Quartzite (primarily SiO2)
metamorphic
Sapphire
Corundum (Al2O3)
mineral
Yellow Quartz (Citrine Quartz Pebble)
Silicon Dioxide (SiO2)
mineral
Pebble (likely Quartzite or Sandstone)
Quartzite (SiO2)
metamorphic
Garnet (Almandine-Pyrope)
Almandine-Pyrope Mg3Al2(SiO4)3 to Fe3Al2(SiO4)3
mineral
Quartzite River Cobble
Quartzite (SiO2)
metamorphic
Fuchsite in Quartz
Muscovite (KAl2(AlSi3O10)(OH)2) containing Chromium + Quartz (SiO2)
metamorphic
Basalt
Basalt (Mafic volcanic rock)
igneous
Basalt (Crushed Stone)
Basalt (Mafic Extrusive Igneous Rock)
igneous
Zebra Jasper
Opaque microcrystalline Quartz (SiO2) with impurities
sedimentary
Quartzite Pebble
Metamorphosed Quartz Sandstone (SiO2)
metamorphic
Granite
Granite (Silicic Intrusive Igneous Rock)
Igneous
Small quartz-rich rock fragment (tentative)
Quartz, silicon dioxide (SiO₂), possibly in a feldspar-bearing granite fragment
mineral
Green Aventurine
Silicon Dioxide (SiO2) with Fuchsite inclusions
mineral
Iron-rich quartzite or ironstone
Ferruginous quartzite; chiefly quartz (SiO₂) with iron oxides such as hematite and goethite
metamorphic
Tumbled jasper or quartzite pebble
Jasper (microcrystalline quartz, SiO₂), possibly iron-stained quartzite
metamorphic
Sandstone (likely Quartzose)
Clastic sedimentary rock (SiO2 primary)
sedimentary
Ruby (Raw Corundum)
Corundum (Al2O3:Cr)
mineral
Rounded quartzite pebble
Quartzite, predominantly crystalline SiO₂
metamorphic
Green Aventurine
Quartz with Fuchsite inclusions (SiO2)
mineral
Corundum (Pink Sapphire / Ruby)
Al2O3 (Aluminum Oxide)
mineral
Yellow Aventurine
Quartz (SiO2) with iron-bearing inclusions
mineral
Labradorite
Labradorite ((Ca, Na)(Al, Si)4O8)
mineral
Black jade or dark serpentine cabochon
Jadeite (NaAlSi₂O₆) or nephrite amphibole; possibly serpentine (Mg₃Si₂O₅(OH)₄)
gemstone
Quartz
Quartz (SiO2 - Silicon Dioxide)
Mineral
Black Granite
Phaneritic Mafic Igneous Rock (likely Gabbronorite or Dolerite)
igneous
Sandstone
Arenite (SiO2 based clastic rock)
sedimentary
Citrine (likely Heat-Treated)
Quartz (Silicon Dioxide, SiO2)
mineral
River Cobble (likely Basalt)
Mafic Igneous Rock (Aphanitic)
Igneous
Nephrite Jade (River Pebble)
Nephrite (Ca2(Mg, Fe)5Si8O22(OH)2)
metamorphic
Quartzite River Rock
Quartzite (primarily SiO2)
metamorphic
Conglomerate
Conglomerate Rock (Paraconglomerate)
sedimentary
Jewelry Chain with Blue and Clear Gemstones (Likely Cubic Zirconia)
Cubic Zirconia (ZrO₂), Silver or White Gold/Platinum Alloy
Mineral (synthetic) and Metal (precious/base)
Painted Garden Rock
Coated Siltstone or Mudstone
sedimentary
Quartzite Pebble
Quartzite (SiO2)
metamorphic
Tourmaline (Schorl or Dravite) on Matrix
Complex Borosilicate - Na(Mg,Fe,Li,Al,Mn)3Al6(BO3)3Si6O18(OH,F)4
mineral
Green Aventurine
Silicon Dioxide (SiO2) with inclusions of Fuchsite (K(Al,Cr)2AlSi3O10(OH)2)
mineral
Black Tourmaline (Schorl)
Schorl (NaFe3Al6(BO3)3Si6O18(OH)4)
mineral
Ruby
Corundum (Al2O3)
mineral
Iron-stained quartzite or quartz-rich sandstone
Quartzite, predominantly SiO₂, with iron-oxide staining
metamorphic
Quartz-rich pegmatite (likely granite/pegmatite boulder)
Coarse-grained felsic igneous rock, chiefly quartz (SiO₂), feldspar, and minor mica; exact identification requires testing
igneous