Corundum (Sapphire/Ruby in Matrix)
Corundum (Al2O3)
mineral
Category
Man Made Metamorphic Style Composite
Browse man made metamorphic style composite specimens identified by the Rock Identifier community.
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Dumortierite in Quartz
Dumortierite (Al6O3(BO3)(SiO4)3) with Quartz (SiO2)
mineral
Note: Item is a Synthetic/Man-made Object
Titanium-coated Stainless Steel (Fe-Cr-Ni-Ti)
Non-geological
Quartzite (or Quartz Slab)
SiO2 (Silicon Dioxide)
metamorphic
Red gemstone ring, likely garnet or synthetic ruby
Possibly almandine garnet (Fe₃Al₂(SiO₄)₃) or corundum/ruby (Al₂O₃); image alone cannot distinguish
gemstone
Black Tourmaline (Schorl)
Sodium Iron Aluminum Borate Silicate (NaFe3Al6(BO3)3Si6O18(OH)4)
mineral
Corundum (Ruby variety)
Aluminium oxide (Al2O3)
mineral
Marble
Metamorphic Limestone (CaCO3)
metamorphic
Quartzite
Metamorphic Quartz Sandstone
metamorphic
Quartzite
Metamorphic Quartzite (SiO2)
metamorphic
Ruby in Matrix
Corundum (Al2O3)
mineral
Quartzite
Metamorphic Quartzite
metamorphic
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)
Rough Sapphire (Corundum)
Corundum (Al2O3)
mineral
Slate
Metamorphic Pelitic Rock
metamorphic
Man-made Synthetic Material (Not a rock or mineral)
Polyester (Polyethylene terephthalate) / Faux Fur
Synthetic / Textile
Man-made Synthetic Material (Costume Faux Fur)
Synthetic Polymer (Polyester/Acrylic)
not a rock
Terracotta (Man-made ceramic brick fragment)
Baked clay / High-iron ceramic (Silicate-based ceramic)
Anthropogenic material (Man-made sedimentary mimic)
Quartzite
Metamorphic Quartzite (SiO2)
metamorphic
Mica Schist
Mica Schist (principally Biotite/Muscovite, Quartz, and Feldspar)
metamorphic
Diorite (Gneissic)
Diorite
igneous
Slate
Metamorphic Pelitic Rock
metamorphic
Quartzite
Metamorphic Quartzite (SiO2)
metamorphic
Quartzite
Metamorphic Quartzite (SiO2)
metamorphic
Quartzite
Metamorphic Quartzite (SiO2)
metamorphic
Quartzite
Metamorphic Quartzite (SiO2)
metamorphic
Quartzite
Metamorphic Quartzite (SiO2)
metamorphic
Quartzite
Metamorphic Quartzite (SiO2)
metamorphic
Tiger Iron
Tiger Iron (Hematite, Red Jasper, and Chert/Tiger's Eye composite)
metamorphic
Tiger Iron
Tiger Iron (Hematite, Red Jasper, and Chert/Tiger's Eye composite)
metamorphic
Clay Brick
Ceramic structural unit (Al2O3·2SiO2·2H2O as precursor)
metamorphic (man-made/anthropogenic)
Quartzite
Metamorphic Rock (Mainly SiO2)
metamorphic
Quartzite
Metamorphic Quartzite (SiO2)
metamorphic
Slate
Metamorphic Pelitic Rock
metamorphic
Quartzite
Metamorphic Quartzite (SiO2)
metamorphic
Slate
Metamorphic Pelitic Rock
metamorphic
Metal Chain (Likely Steel or a Steel Alloy)
Steel (primarily iron and carbon); specific alloy unknown
Man-made Object (Metal/Alloy)
White Marble
Recrystallized Calcite (CaCO3)
metamorphic
Quartzite
Metamorphic Quartzite (SiO2)
metamorphic
Quartzite
Metamorphic Quartzite (SiO2)
metamorphic
Quartzite
Metamorphic Quartz Arenite
metamorphic
Quartzite
Metamorphic Quartzite (SiO2)
metamorphic