Sapphire in a ring
Corundum (Al2O3)
mineral
Community gallery
All rocks & minerals
Every specimen the Rock Identifier community has discovered, from desert agates to deep-sea basalts.
Ocean Jasper or Orbicular Jasper
SiO2
mineral
Ocean Jasper
Orbicular Jasper (variety of Chalcedony)
mineral
Ocean Jasper
Orbicular Jasper, Chalcedony (SiO2)
mineral
Dinosaur Bone
Agatized Dinosaur Bone
sedimentary/fossil
Agate
SiO2 (Silicon dioxide, chalcedony variety)
Mineral
Blue Lace Agate (or similar Chalcedony)
SiO2 (Silicon Dioxide)
mineral
Agate
SiO2 (Silicon dioxide, chalcedony variety)
Mineral
Agate
SiO2
Mineral
Dyed Agate
Chalcedony (SiO2)
Mineral
Dyed Agate
Silicon dioxide, SiO2
Mineral (Chalcedony)
Dyed Agate
SiO2
Mineral
Dyed Agate
SiO2
mineral
Agate
SiO2
Mineral
Crazy Lace Agate
Silicon Dioxide (SiO2)
mineral
Chert
Chert (Microcrystalline Quartz, SiO2)
sedimentary
Obsidian
Obsidian (Volcanic Glass, ~70% SiO2)
igneous
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Anthracite Coal
Anthracite (Carbon ≥ 86%)
sedimentary
Amygdaloidal Basalt
Basalt with secondary mineral infillings (SiO2, (Ca,Na)2-3(Mg,Fe,Al)5Si8O22(OH)2)
igneous
Agate
Agate (Silicon Dioxide, SiO2)
mineral
Leopard Skin Jasper
Rhyolite (Silicon Dioxide with impurities), SiO2
igneous
Dragon Vein Agate
Chalcedony (cryptocrystalline Quartz), SiO2
mineral
Chert (Flint)
Microcrystalline Quartz (SiO2)
sedimentary
Limonite (Gossan)
FeO(OH)·nH2O (Hydrated Iron Oxide)
mineral
Iron Slag
Anthropogenic pyrometallurgical byproduct
igneous
Scoria
Vesicular Basalt / Scoria
igneous
Conglomerate
Clastic sedimentary rock (Psephite)
sedimentary
Sandstone
Arenite
sedimentary
Pumice
Pumice (Vesicular volcanic glass)
igneous
Quartzite
Quartzite (SiO2)
metamorphic
Granite
Granite (Phaneritic Quartz-Feldspar Rock)
igneous
Vesicular Basalt
Mafic Igneous Rock (primarily Plagioclase and Pyroxene)
igneous
Porphyritic Rhyolite
Porphyritic Rhyolite (SiO2)
igneous
Epithermal Gold Ore (in Quartz/Rhyolite matrix)
Auriferous Quartz (Au + SiO2)
mineral
Sandstone
Arenite (SiO2 dominant)
sedimentary
Chert
Microcrystalline Quartz (SiO2)
sedimentary
Basalt Pebble
Basalt
igneous
Sandstone (Greywacke)
Arenite / Lithic Wacke (SiO2 predominant)
sedimentary
River Rocks and Pebbles
Mixed Silica-rich Sediments (SiO2 based)
sedimentary
Milky Quartz
Quartz (Silicon Dioxide, SiO2)
mineral
Quartz, Sandstone, and Siltstone specimens
Silicon Dioxide (SiO2) and Clastic Sedimentary Rocks
mineral and sedimentary