Pink Opal
Amorphous Hydrous Silica (SiO2·nH2O)
mineral
Category
Sedimentary Or Igneous (Host Environment)
Browse sedimentary or igneous (host environment) specimens identified by the Rock Identifier community.
Learn about Sedimentary Or Igneous (Host Environment) in the encyclopedia
View all →
Chert (Chalcedony/Agate variety)
Silicon dioxide (SiO2)
sedimentary
Chalcedony in Host Rock
Chalcedony (SiO2)
mineral
Clear Quartz Cluster
Crystalline Silicon Dioxide (SiO2)
mineral
Malachite in Host Rock
Malachite - Cu2CO3(OH)2
mineral
Quartz Druze
Silicon Dioxide (SiO2)
mineral
Druzy Quartz on Matrix
Silicon Dioxide (SiO2) on host rock
mineral
Druzy Quartz (on Geode Fragment)
Silicon Dioxide (SiO2)
mineral
Milky Quartz Vein in Mafic Rock
Quartzite vein in Metabasalt (SiO2 base)
metamorphic
Quartz with Mica
Silicon Dioxide (SiO2) with Mica group inclusions
mineral
Quartz Vein in Greenstone
Hydrothermal Quartz (SiO2) with Chlorite/Epidote Schist host rock
metamorphic
Chert / Flint Nodules in Sandstone
Microcrystalline Quartz (SiO2) within Clastic Sedimentary Rock
sedimentary
Banded Agate
Silicon Dioxide (SiO2)
mineral
Rough Chalcedony / Jasper Nodules
Silicon Dioxide (SiO2)
mineral
Copper-bearing Basalt with Epidote and Quartz
Native copper in basalt amygdaloidal matrix
igneous
Quartz Pebble with Epidote / Chlorite Inclusions
Silicon Dioxide (SiO2) with Epidote/Chlorite inclusions
mineral
Rounded gray pebble
Indeterminate; likely a water-worn silicate or carbonate pebble
sedimentary
K2 Jasper (K2 Granite)
Azurite in Granite (Al2Cu3(CO3)2(OH)2 in NaAlSi3O8)
igneous
Iron-stained Quartz (with Limonite/Hematite)
Silicon Dioxide (SiO2) with Iron Oxide inclusions (FeO(OH) or Fe2O3)
Mineral
Chalcedony Nodule (Agate/Chert)
Chalcedony (cryptocrystalline Silicon Dioxide, SiO2)
mineral
Quartz Pebble
Silicon Dioxide (SiO2)
sedimentary
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Pegmatite
Igneous Pegmatite
igneous
Pegmatite
Igneous Pegmatite
igneous
Chalcedony (Botryoidal Agate vein)
Chalcedony (Microcrystalline Quartz) - SiO2
mineral
Pyrite on Quartz matrix
Iron Disulfide (FeS2) on Silicon Dioxide (SiO2)
mineral
Black Limestone with Calcite Veins
Carboniferous Limestone with Secondary Calcite Infill
sedimentary
Rock Fragment with Calcite/Quartz Vein
Polymictic Rock Fragment (SiO2 / CaCO3)
igneous
Rough Chalcedony / Jasper Agate Nodule
Silicon Dioxide (SiO2) - Microcrystalline Quartz
sedimentary
Pegmatite (Quartz with Tourmaline/Biotite inclusions)
Igneous Pegmatite
igneous
Quartz (Smoky/Milky variety)
Silicon Dioxide (SiO2)
mineral
Bull Quartz with Mica and Host Rock
Massive Quartz (SiO2) with Muscovite/Chlorite inclusions
igneous
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Chert (or Chalcedony) Nodule
Microcrystalline Quartz (SiO2)
sedimentary
Weathered porphyritic volcanic rock
Likely altered andesite or rhyolite porphyry
igneous
Quartz crystal with Pyrite inclusions
Silicon Dioxide (SiO2) with Iron Sulfide (FeS2)
mineral
Pegmatite
Igneous Pegmatite (Quartz-Feldspar-Mica)
igneous
Pegmatite
Igneous Pegmatite (Quartz-Feldspar-Biotite)
igneous
Pegmatite
Pegmatite (felsic intrusive igneous rock)
igneous
Quartz Vein Rock
Silicon Dioxide (SiO2)
mineral
Glauconitic Sandstone with possible Trace Fossil
Glauconitic Sandstone (K(Fe,Al)2(Si,Al)4O10(OH)2)
sedimentary