Chert (Limestone-hosted Pebble)
Sedimentary Cryptocrystalline Quartz (SiO2)
sedimentary
Category
Sedimentary Or Igneous (Host Environment)
Browse sedimentary or igneous (host environment) specimens identified by the Rock Identifier community.
Chert (Jasper/Agate variety)
Microcrystalline Quartz (SiO2)
sedimentary
Precious Opal
Hydrated Silica (SiO2·nH2O)
mineral
Quartz on Basalt
Silicon Dioxide (SiO2) on Mafic Igneous Rock
Mineral on Igneous Rock
![Granite with Quartz Vein (Phaneritic Felsic Igneous Rock (composed of Quartz [SiO2], Feldspar, and Mica)) — igneous](https://media.rockidentification.com/50ebadd6-ed66-4e73-abce-e70c662464c5-thumbnail.jpg)
Granite with Quartz Vein
Phaneritic Felsic Igneous Rock (composed of Quartz [SiO2], Feldspar, and Mica)
igneous
Garnet (Red Garnet)
Garnet Group. The red varieties seen in jewelry are typically Almandine (Fe3Al2(SiO4)3), Pyrope (Mg3Al2(SiO4)3), or a mix of the two (pyrope-almandine series).
Mineral (specifically, a variety of the mineral species Pyrope-Almandine Garnet)
Milky Quartz Pebble
Quartz (Silicon Dioxide, SiO2)
mineral
Lodolite (Garden Quartz)
Silicon Dioxide (SiO2) with inclusions (Chlorite, Hematite, etc.)
mineral
Basalt with Quartz Veins
Aphanitic Mafic Igneous Rock (Main body: SiO2, Fe, Mg rich)
igneous
Mica in Quartz Host
Muscovite (KAl2(AlSi3O10)(OH)2) in Quartz (SiO2)
igneous
Granodiorite
Granodiorite (Quartz + Plagioclase + Alkali Feldspar + Biotite/Hornblende)
igneous
Gold-bearing Quartz Ore
Auriferous Quartz (SiO2 with Au)
mineral
Sandstone (Ferruginous)
Arenite (iron-rich)
sedimentary
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Raw Emerald in Matrix
Beryl (Be3Al2Si6O18) with Chromium/Vanadium impurities
mineral
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Quartz Vein with Host Rock (Greywacke/Siltstone)
Silicon Dioxide (SiO2) within Clastic Sedimentary/Metamorphic Matrix
metamorphic
Chert (often found within Limestone)
Silicon Dioxide (SiO2) - Microcrystalline Quartz
sedimentary
Chert (Common Opal/Jasper transition)
Silicon Dioxide (SiO2)
sedimentary
Seam Agate
Agate (Banded variety of Chalcedony, SiO2)
mineral
Dendritic Agate
Silicon Dioxide (SiO2) with inclusions of manganese or iron oxide
mineral
Quartz Geode (Cracked Open Fragment)
Silicon Dioxide (SiO2)
mineral
Diorite (River Cobble)
Intermediate plutonic igneous rock
igneous
Aragonite (Sputnik habit)
Aragonite (Calcium Carbonate, CaCO3)
mineral
Granite
Granite (Phaneritic intrusive igneous rock)
igneous
Quartz Vein in Host Rock
Silicon Dioxide (SiO2) within Metasedimentary or Igneous Matrix
metamorphic
Rough Blue Sapphire
Corundum (Al2O3)
mineral
Quartz (Smoky/Milky variety)
Silicon Dioxide (SiO2)
mineral
Milky Quartz
Quartz (Silicon Dioxide, SiO2)
mineral
Quartz Vein in Pelite (Metamorphic Rock)
Hydrothermal Quartz Veining in Metasedimentary Rock (SiO2)
metamorphic
Quartz Pebble
Silicon Dioxide (SiO2)
Mineral / Sedimentary component
Sandstone Concretion
Arenaceous concretion (primarily SiO2 with Fe2O3 staining)
sedimentary
Chert (Iron-stained)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Granite Pebble
Felsic Intrusive Igneous Rock
igneous
Basalt with Quartz Veins
Amygdaloidal Basalt (matrix) with Crystalline SiO2 (veins)
igneous
Pyrite in Matrix (Quartz/Schist)
Iron Sulfide (FeS2)
mineral
Carnelian
Carnelian (Microcrystalline Quartz, SiO2 with Fe2O3 impurities)
mineral
Chalcedony with Druzy Quartz Geode
Silicon Dioxide (SiO2)
mineral
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Milky Quartz
Quartz (Silicon Dioxide, SiO2)
mineral
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Calcite
Calcite (Calcium Carbonate, CaCO3)
mineral