Carnelian Agate
Silicon Dioxide (SiO2) - Variety: Chalcedony
mineral
Category
Mineral Like Byproduct (Often Mistaken For Igneous Rock Or Meteorite)
Browse mineral like byproduct (often mistaken for igneous rock or meteorite) specimens identified by the Rock Identifier community.
Granite Cobble (River Stone)
Felsic intrusive igneous rock (composition: Quartz, Feldspar, Mica)
igneous
Orange Calcite
Calcite (Calcium Carbonate - CaCO3)
mineral
Peridot
Olivine (Mg,Fe)2SiO4
Mineral
Quartz with Muscovite Mica
SiO2 with KAl2(AlSi3O10)(OH)2
mineral group
Quartz Vein / Milky Quartz
Silicon Dioxide (SiO2)
mineral
Muscovite Mica
Muscovite (KAl2(AlSi3O10)(OH)2)
mineral
Granodiorite with Quartz Veining
Granodiorite (containing Plagioclase Feldspar, Quartz, and Biotite/Hornblende) with Quartz (SiO2) veins
igneous
Granite Tile (Commercial Granite)
Granite (Phaneritic Quartz-Feldspar Plutonic Rock)
igneous
Sandstone
Arenite (SiO2 dominant)
sedimentary
Quartz
Quartz (SiO2 - Silicon Dioxide)
Mineral
Clear Quartz
Quartz (Silicon Dioxide, SiO2)
mineral
Limonite-stained Granite
Felsic Plutonic Rock with Hydrated Iron Oxides
igneous
Basalt (Vesicular)
Vesicular Basalt
Igneous
Ferruginous Quartz (Iron-stained Quartz)
Silicon Dioxide (SiO2) with Hematite/Limonite impurities
mineral
Basalt
Basalt
igneous
Greenstone (Greenstone River Pebble)
Greenschist (metamorphosed mafic igneous rock)
metamorphic
Gneiss (specifically Biotite Gneiss)
Gneiss (high-grade metamorphic rock primarily composed of Silicates)
metamorphic
Sandstone (Banded)
Clastic Sedimentary Rock (primarily SiO2)
sedimentary
Amethyst (Tumbled)
Amethyst (Silicon Dioxide, SiO2 + Fe4+)
mineral
Basalt
Mafic volcanic rock (primarily Plagioclase and Pyroxene)
igneous
Quartz / Common Agate
Silicon Dioxide (SiO2)
mineral
Pumice
Vesicular volcanic glass
igneous
Fuchsite
Chromium-rich Muscovite (KAl2(AlSi3O10)(OH,F)2 with Cr replacements)
mineral
Green Chalcedony (likely Chrysoprase or Green Onyx)
Silicon Dioxide (SiO2) with trace nickel or chromium inclusions
mineral
Blue Dumortierite Quartz
AlAl6BSi3O18 (Dumortierite) within SiO2 (Quartz)
mineral
Sandstone
Arenite (primarily SiO2)
sedimentary
Clear Quartz (Rock Crystal)
Silicon Dioxide (SiO2)
mineral
Schist
Schist (various mineralogical compositions including mica, chlorite, talc, etc.)
Metamorphic
Sandstone (Quartzite Pebble)
Arenite (primarily SiO2)
sedimentary
Basalt
Vesicular Basalt
igneous
Serpentine Jade (New Jade/Olive Jade)
Serpentinite (a rock composed primarily of serpentine minerals) / Mg3Si2O5(OH)4 for Antigorite and Lizardite
Mineral
Blue Sapphire
Corundum (Al2O3)
mineral
Granite Pebble
Granite (Phaneritic intrusive igneous rock comprising Quartz, Feldspar, and Mica)
igneous
Muscovite Schist
Muscovite Mica Schist (KAl2(AlSi3O10)(OH)2)
metamorphic
Porphyritic Basalt
Amygdaloidal Porphyritic Basalt
igneous
Quartz in Matrix (possibly Basalt or Siltstone host)
Silicon Dioxide (SiO2) in Host Rock
mineral
Shale
Shale (Lutite)
sedimentary
Basalt (Vesicular)
Basalt (Extrusive Volcanic Rock)
igneous
Pumice (Vesicular Rhyolite/Andesite)
Pumice (a highly vesicular volcanic glass/extrusive igneous rock)
igneous
Ferruginous Quartz (Iron-stained Quartz)
Silicon Dioxide (SiO2) with Hematite/Goethite inclusions
mineral
Quartz Geode
Silicon Dioxide (SiO2) within a geode
mineral