Chevron Amethyst
Silicon Dioxide (SiO2) with trace Iron impurities
mineral
Category
Mineral Like (Natural Glass)
Browse mineral like (natural glass) specimens identified by the Rock Identifier community.
Learn about Mineral Like (Natural Glass) in the encyclopedia
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Petrified Wood
Silicified Wood (primarily Chalcedony/Quartz, SiO2)
fossil
Clear Quartz
Silicon Dioxide (SiO2)
mineral
Cubic Zirconia (Simulated Diamond)
Cubic Zirconia (ZrO2)
mineral
Smoky quartz fragment
Quartz, silicon dioxide (SiO₂), smoky variety
mineral
Tumbled quartz (likely clear quartz)
Quartz, silicon dioxide (SiO₂)
mineral
Green Aventurine
Aventurine Quartz (SiO2 with inclusions of Fuchsite)
Mineral
Jasper pebble
Silicon Dioxide (SiO2 with iron oxide inclusions)
sedimentary
Ferruginous Sandstone (with possible Epidote/Chlorite coloring)
Sandstone (SiO2 dominated with Fe2O3 staining)
sedimentary
Granite Pebble
Granite (Plutonic Igneous Rock)
igneous
Citrine (Heat-Treated)
Silicon Dioxide (SiO2)
mineral
Granite
Granite (Mainly Quartz, Feldspar, and Mica/Amphibole)
igneous
Sandstone
Sandstone (principally SiO2)
sedimentary
Golden Quartz (Citrine or Iron-stained Quartz)
Silicon Dioxide (SiO2)
mineral
Dyed and Metallic Coated Agate Geode
Silicon Dioxide (SiO2) with titanium/gold vapor deposition coating
sedimentary (primary) with artificial modification
Precious Coral
Corallium rubrum (Calcium carbonate with trace carotene)
Organic gemstone / Sedimentary mineraloid
Citrine
Silicon Dioxide with iron impurities (SiO2)
mineral
Tourmalinated quartz sphere
Quartz (SiO₂) with black schorl tourmaline inclusions
mineral
Smoky Quartz
SiO2 (Silicon Dioxide with aluminum impurities)
mineral
Diamond
Native Carbon (C)
mineral
Sandstone
Sedimentary Rock (Quartz Sandstone)
sedimentary
Granite
Granite (composed primarily of Quartz SiO2, Orthoclase KAlSi3O8, and Plagioclase NaAlSi3O8 to CaAl2Si2O8)
Igneous
Rough Diamond
Diamond (pure carbon / C)
mineral
Milky Quartz Pebble (Beach Agate / Quartz)
Silicon Dioxide (SiO2)
mineral
Diamond (or Cut Gemstone / Cubic Zirconia)
Carbon (C)
gemstone
Jasper
Jasper (SiO2 plus impurities)
sedimentary
Shale with Trace Fossils
Fissile mudrock (Shale)
sedimentary
Mossy Rock
Mixed lithology rock with Bryophyta (moss)
sedimentary
Citrine
Silicon Dioxide (SiO2)
mineral
Quartz Pebble
Quartz (Silicon Dioxide, SiO2)
mineral
Rose Quartz Beads
Crystalline Silicon Dioxide (SiO2) with trace amounts of titanium, iron, or manganese
gemstone
Tumbled jasper (likely picture jasper or iron-rich jasper)
Microcrystalline quartz/chalcedony, SiO₂, colored by iron oxides
sedimentary
Ironstone concretion / Limonitic Sandstone
Goethite/Hematite Cemented Sandstone (Hydrated Iron Oxide)
sedimentary
Opalite
Opalescent Glass (SiO2 + coloring agents)
Mineral (Synthetic/Man-made)
Rough Citrine Quartz
Silicon Dioxide (SiO2) with iron impurities
mineral
Diamond
Carbon (C)
gemstone
Clear Quartz
Silicon Dioxide (SiO2)
mineral
Granite
Phaneritic plutonic rock (Quartz, Feldspar, Mica)
igneous
Smoky Quartz
Smoky Quartz (Silicon Dioxide - SiO2)
mineral
Smoky Quartz and Pyrite Cluster
Silicon Dioxide (SiO2) with Iron Sulfide (FeS2)
mineral
Citrine
Yellow Quartz (SiO2)
mineral
Citrine
Silicon Dioxide (SiO2)
mineral