Carnelian Agate
Silicon Dioxide (SiO2) - variety of Chalcedony
sedimentary
Category
Sedimentary (Secondary Mineral) Within Igneous
Browse sedimentary (secondary mineral) within igneous specimens identified by the Rock Identifier community.
Learn about Sedimentary (Secondary Mineral) Within Igneous in the encyclopedia
View all →
Quartz (Variety: Citrine or Tumbled Chalcedony)
Silicon Dioxide (SiO2)
mineral
Common Opal
Hydrated Amorphous Silica (SiO2·nH2O)
mineraloid
Limonite
FeO(OH)•nH2O
mineral
Gneiss Pebble
Gneiss (High-grade metamorphic rock)
metamorphic
Quartz on Host Rock
Silicon Dioxide (SiO2)
Mineral Specimen
Fluorite, Turquoise, and Calcite set
Calcium Fluoride (CaF2), Hydrous Phosphate of Copper and Aluminum (CuAl6(PO4)4(OH)8·4H2O), Calcium Carbonate (CaCO3)
mineral
Manganese Ore (Psilomelane/Pyrolusite)
Psilomelane ((Ba,H2O)2Mn5O10) and Pyrolusite (MnO2)
Mineral
Agate Geode
Chalcedony (SiO2 - Silicon Dioxide)
sedimentary (secondary mineral formation)
Gneiss (Metamorphosed Granitic Rock)
Gneiss (composed mainly of quartz, feldspar, biotite, and/or hornblende)
metamorphic
Iridium sand or Osmium-Iridium nugget
Iridosmine / Osmiridium (Platinoid grouping)
mineral
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Amygdaloidal Basalt
Basalt (with filled vesicles/amygdules)
igneous
Banded Gneiss
Gneiss
metamorphic
Pyrite (on Shale/Matrix)
Iron Disulfide (FeS2)
mineral
Gneiss
Gneiss
metamorphic
Iron-stained Quartz Pebble
Silicon Dioxide (SiO2) with Hematite/Limonite coatings
mineral
Milky Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Vivianite
Vivianite, Fe2+3(PO4)2·8H2O
mineral
Native Copper
Copper (Cu)
mineral
Pyrite-bearing Rock
Iron Sulfide (FeS2)
mineral
Amygdaloidal Basalt
Basalt with secondary amygdule minerals (likely Epidote or Chlorite)
igneous
Amygdaloidal Basalt
Basalt with secondary mineral infilling (commonly SiO2 or Zeolites)
igneous
Limonite (Iron Ore)
FeO(OH)·nH2O (Hydrous ferric oxide)
mineral
Quartz Geode
Crystalline Silicon Dioxide (SiO2) in Geode form
mineral
Banded Agate (Agatized Geode Slice)
Silicon Dioxide (SiO₂)
mineral
Clear Quartz (Druzy)
Crystalline Silicon Dioxide (SiO2)
mineral
Iron-stained Quartz
Silicon Dioxide with Iron Oxide (SiO2 + Fe2O3)
mineral
Ferruginous Quartz
Silicon Dioxide (SiO2) with Iron Oxide (Fe2O3) inclusions
mineral
Amygdaloidal Basalt
Amygdaloidal Basalt with Secondary Mineral Amygdules
igneous
Amygdaloidal Basalt
Amygdaloidal Basalt (containing quartz/agate or zeolite fill)
igneous
Basalt with Quartz Vein
Basalt (Mafic Extrusive Igneous Rock)
igneous
Amygdaloidal Rhyolite
Amygdaloidal felsic extrusive rock
igneous
K2 Jasper (K2 Stone)
Azurite in Granite / Quartzite
metamorphic
Vesicular Basalt with Secondary Mineral Infill
Mafic Volcanic Rock (Basalt)
igneous
Limonite
FeO(OH)·nH2O
mineral
Limonite (Iron Ore)
Limonite (FeO(OH)·nH2O)
mineral
Satin Spar (Gypsum)
Calcium Sulfate Dihydrate (CaSO4·2H2O)
mineral
Gneiss
Gneiss (High-grade Regional Metamorphic Rock)
metamorphic
Prehnite
Prehnite - Ca2Al(AlSi3O10)(OH)2
mineral
Chalcedony Geode
Chalcedony (SiO2) within a geode structure
Mineral Geode/Sedimentary or Volcanic related
Basalt with vesicles (Amygdaloidal Basalt)
Amygdaloidal Basalt (predominantly Plagioclase and Pyroxene)
igneous