Tree Agate (Dendritic Agate)
Silicon Dioxide (SiO2) with Manganese/Iron inclusions
mineral
Category
Metamorphic Rock (Variety Of Quartz)
Browse metamorphic rock (variety of quartz) specimens identified by the Rock Identifier community.
Learn about Metamorphic Rock (Variety Of Quartz) in the encyclopedia
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Quartzite (River Cobble)
Metamorphic Rock (composed predominantly of SiO2)
metamorphic
Feldspar (specifically Orthoclase)
Potassium Aluminum Silicate (KAlSi3O8)
mineral
Smoky Quartz (Tumbled)
Silicon Dioxide (SiO2)
mineral
Blue Calcite
Calcite (CaCO3)
mineral
Aventurine (likely Green Aventurine)
Silicon Dioxide (SiO2) with mineral inclusions
Mineral/Mineraloid within a rock matrix
Quartzite Pebble
Quartzite (composed primarily of Silica, SiO2)
metamorphic
Amygdaloidal Rhyolite
Amygdaloidal Rhyolite (Felsic volcanic rock)
igneous
Smoky Quartz with Hematite inclusions
Silicon Dioxide (SiO2) with Fe2O3 inclusions
mineral
Smoky Quartz
Smoky Quartz (Silicon Dioxide - SiO2)
mineral
Druzy Quartz Geode (likely Smokey Quartz variety)
Silicon Dioxide (SiO2) - specifically a geode formation lined with druzy quartz crystals, with a likely brownish hue indicating smokey quartz.
Mineral structure/Rock
Quartzite
Quartzite (primarily SiO2)
metamorphic
Quartzite
Metamorphosed Quartz Sandstone (SiO2)
metamorphic
Quartzite Pebbles
Crystalline silica rock (SiO2)
metamorphic
Agate Geode / Thunderegg
Chalcedony (cryptocrystalline variety of Quartz), SiO2
mineral
Iron-stained Quartzite
Metamorphosed Quartz (SiO2) with Hematite/Limonite impurities
metamorphic
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Granite
Phaneritic intrusive igneous rock
igneous
Serpentinite
Serpentinite (Mg, Fe, Ni, Al, Zn, Mn)3Si2O5(OH)4
metamorphic
Tiger's Eye (likely Hawk's Eye variant)
Pseudomorph of Quartz after Crocidolite (SiO2)
metamorphic
Gneiss
Gneiss (High-grade Regional Metamorphic Rock)
metamorphic
Quartz (Smoky/Druzy variety)
Silicon Dioxide (SiO2)
mineral
Banded Gneiss
Gneiss (variable mineral composition)
metamorphic
Quartzite with Hematite staining
Metamorphosed Quartz Sandstone (SiO2)
metamorphic
Blue Sapphire (Tumbled/Polished)
Corundum (Al2O3)
mineral
Yellow Quartzite (River Pebble)
Metamorphic Quartzite (SiO2)
metamorphic
Clear Quartz (Rock Crystal)
Silicon Dioxide (SiO2)
mineral
Quartzite (Tumbled Pebble)
Metamorphosed Quartz Sandstone (SiO2)
metamorphic
Amethyst
SiO2 (Silicon Dioxide) - a variety of Quartz
Mineral
Unakite
Epidotized Granite
metamorphic
Jasper with Quartz Veining
Silicon Dioxide (SiO2) - Opaque cryptocrystalline variety of Quartz
sedimentary
Jasper
Jasper (Silica/Quartz) - SiO2
sedimentary
Jasper and Agate
Microcrystalline Quartz (SiO2)
sedimentary
Quartzite pebble
Metamorphic Quartzite (primarily SiO2)
metamorphic
Quartzite Pebble
Metamorphic Quartzite (SiO2)
metamorphic
Jasper in Quartzite (likely Cinnabar or Iron inclusions)
Silicon dioxide (SiO2) with impurities
metamorphic
Rhyolite
Rhyolite (felsic extrusive igneous rock)
igneous
Chert (Flint)
Chert (SiO2)
sedimentary
Banded Calcite (often sold as 'Mexican Onyx')
Calcite (Calcium Carbonate, CaCO3)
Mineral / Sedimentary Rock
Unakite
Epidotized Granite
metamorphic
Pink Granite Gneiss
Gneiss (High-grade metamorphic rock)
metamorphic
Quartzite Pebble
Metamorphosed Quartz Sandstone (SiO2)
metamorphic