Chert with Quartz Veining
Microcrystalline Silica (SiO2)
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 →
Vesicular Basalt
Vesicular Basalt (Aphanitic Mafic Rock)
igneous
Granitic Gneiss Pebble
Gneiss (felsic metamorphic rock)
metamorphic
Gneiss
Gneiss
metamorphic
Limonite (Goethite/Ironstone)
Hydrated iron oxide-hydroxide, approximately FeO(OH)·nH2O
mineral
Rhodochrosite
Manganese carbonate (MnCO3)
mineral
Amygdaloidal Basalt with Quartz
Basalt (SiO2 inclusion)
igneous
Banded Rhyolite (likely Green Jasper/Agate variety)
Silicon Dioxide (SiO2) with mineral inclusions
igneous
Chalcedony (Agate / Quartz Pebble)
Silicon Dioxide (SiO2)
mineral
Native Silver Nugget
Silver (Ag)
mineral
Chalcedony (Agate)
Quartz (Silicon Dioxide, SiO2)
mineral
Banded Agate
Agate (Cryptocrystalline Quartz, SiO2)
mineral
Sapphire (Corundum)
Corundum (Al2O3)
mineral
Turquoise
Turquoise (CuAl6(PO4)4(OH)8·4H2O)
mineral
Gneiss
Gneiss
metamorphic
Banded Agate (with small Geode cavity)
Silicon Dioxide (SiO2) - Chalcedony variety
mineral
Gneiss Pebble
Gneiss
metamorphic
Chert (Limestone-based)
Silicon Dioxide (SiO2)
sedimentary
Ironstone with Limonite/Goethite coating
Ferruginous Sedimentary Rock (contains Limonite FeO(OH)·nH2O)
sedimentary
Amygdaloidal Basalt
Vesicular Basalt with Amygdules
igneous
Pyrite in Quartz Matrix
Iron Disulfide (FeS2) in Silicon Dioxide (SiO2)
mineral
Basalt with Quartz/Calcite Veins
Amygdaloidal Basalt (SiO2 or CaCO3 inclusions)
igneous
Gneiss
Gneiss (High-grade Metamorphic Rock)
metamorphic
Beach Pebble Quartzite / Chalcedony Pebble
Silicon Dioxide (SiO2)
metamorphic
Limonite (Hydrated Iron Oxide / Bog Iron)
FeO(OH)·nH2O
Mineral (Sedimentary context)
Green Onyx (Banded Calcite)
Travertine (CaCO3 - Calcium Carbonate)
sedimentary
Basalt with Amygdule
Aphanitic Mafic Volcanic Rock (Basalt) with Zeolite/Quartz Infill
igneous
Basalt
Mafic Igneous Rock (composed primarily of plagioclase, pyroxene, and olivine)
igneous
Granite Gneiss
Metamorphic Rock (Quartz, Potassium Feldspar, Plagioclase, Biotite/Amphibole)
metamorphic
Basalt with Epidote (Porphyritic Basalt)
Mafic Porphyritic Basalt with (Ca2(Al2,Fe3+)(SiO4)(Si2O7)O(OH)) inclusions
igneous
Limonite / Goethite Ironstone
FeO(OH)·nH2O (Hydrous iron oxide)
mineral
Calcite with Quartz coating
Calcium Carbonate (CaCO3) with Silicon Dioxide (SiO2)
mineral
Basalt
Mafic Igneous Rock
igneous
Likely tumbled quartz/chalcedony
Quartz (SiO₂), possibly milky quartz or pale chalcedony
mineral
Smoky Quartz
Smoky Quartz (SiO2)
mineral
Septarian Nodule
Septarian Concretion (Calcite, Aragonite, and Limestone)
sedimentary
Boxwork Siderite or Sepatarian Nodule Weathering
Siderite (FeCO3) with secondary mineralization or Boxwork Geode fragment
sedimentary
Brecciated Jasper
Brecciated Jasper (Microcrystalline Quartz / SiO2)
sedimentary
Jasper
Jasper (Silicon Dioxide, SiO2)
sedimentary
Sandstone (Quartzite texture)
Arenite (SiO2 secondary)
sedimentary
Botryoidal Hematite (Kidney Ore)
Hematite (Fe2O3)
mineral
Agate (Chalcedony)
Silicon Dioxide (SiO2)
mineral