Chalcedony (Agate/Jasper mix in host rock)
Chalcedony (cryptocrystalline Silicon Dioxide, SiO2)
mineral
Category
Mineral Within A Sedimentary Rock
Browse mineral within a sedimentary rock specimens identified by the Rock Identifier community.
Gneiss (specifically a Banded Gneiss pebble)
Gneiss (High-grade Regional Metamorphic Rock)
metamorphic
Olivine in Basalt (Peridot)
Magnesium Iron Silicate (Mg,Fe)2SiO4 (Mineral) within Basalt (Rock)
igneous
Green Chert (Jasper)
Silicon Dioxide (SiO2)
sedimentary
Chert (Iron-rich or Jasperoid)
Cryptocrystalline Quartz (SiO2)
sedimentary
Sandstone
Clastic sedimentary rock (primarily SiO2)
sedimentary
Dalmatian Stone
Dalmatian Jasper (a misnomer) / Perthitic Igneous Rock
igneous
Smoky Quartz
Smoky Quartz (SiO2: Silicon Dioxide)
mineral
Chert (Jasper variety)
Silicon Dioxide (SiO2)
sedimentary
Red Jasper
Jasper (Silica/Silicon Dioxide, SiO2 plus iron inclusions)
sedimentary
Labradorite (a variety of Feldspar)
Labradorite; (Na,Ca)(Al,Si)4O8 (a plagioclase feldspar)
igneous
Chert Nodule (Commonly known as Flint or River Rock)
Silicon Dioxide (SiO2)
sedimentary
Shale
Shale
sedimentary
Chert (specifically Jasper or Brown Chert node)
Microcrystalline Quartz (SiO2)
sedimentary
Sandstone Concretion
Moqui Marble (Iron-oxide concretion)
sedimentary
Tiger's Eye
Pseudomorph of Quartz after Crocidolite (SiO2)
mineral
Sandstone (Tumbled/River Pebble)
Arenite (composed primarily of SiO2)
sedimentary
Okenite (in Zeolite matrix)
Okenite (CaSi2O5 · 2H2O)
mineral
Chalcedony Geode
Chalcedony (SiO2) within a geode structure
Mineral Geode/Sedimentary or Volcanic related
Labradorite (Feldspar)
Labradorite, (Ca,Na)(Al,Si)4O8
mineral
Pebble
Clast (specifically a granule or small pebble)
Sedimentary
Ironstone (Limonitic Shale)
Ferruginous Siltstone / Goethite-rich Sedimentary Rock
sedimentary
Pumice
Pumice (volcanic rock)
Igneous
Chert (Pebble)
Microcrystalline silica (SiO2)
sedimentary
Gneiss (Metamorphic Rock)
Gneiss
metamorphic
Brown Jasper
Jasper (a cryptocrystalline variety of Quartz, SiO2)
Mineral, specifically a variety of Quartz
Chrysocolla in Matrix
Hydrated copper phyllosilicate (Cu,Al)2H2Si2O5(OH)4' nH2O on Quartz/Feldspar matrix
mineral
Chert (and Limestone) River Cobble
Microcrystalline Quartz (SiO2) within Calcium Carbonate (CaCO3)
sedimentary
Agate Geode
Silicon Dioxide (SiO2) - variety Chalcedony/Quartz
sedimentary
Chert (Brecciated River Cobble)
Silicon Dioxide (SiO2)
sedimentary
Sandstone or Limestone
Arenite or Calcareous Sedimentary Rock
Sedimentary
Crazy Lace Agate
Silicon Dioxide (SiO2) - Chalcedony variety
mineral
Peridot in Basalt
Olivine ((Mg, Fe)2SiO4) in Basalt
mineral
Quartz Druzy on Agate (River Cobble)
Silicon Dioxide (SiO2)
Mineral / Sedimentary (often associated with volcanic hosts)
Howlite and Purple Amethyst Druzy
Calcium Borosilicate Hydroxide (Howlite) and Silicon Dioxide (Quartz/Amethyst)
mineral
Banded Chert (or Flint)
Microcrystalline Quartz (SiO2)
sedimentary
Indigo Gabbro
Gabbro (MaFIC intrusive rock)
igneous
Chert (Flint)
Chert (Silicon Dioxide, SiO2)
sedimentary
Chert (Yellow or Ochre Jasper variant)
Microcrystalline Quartz (SiO2)
sedimentary
Laterite (iron-rich nodule, possibly Bauxite as a subtype)
Laterite (composed of various minerals including goethite, hematite, gibbsite, etc.)
Sedimentary
Chert (specifically Tan/Yellow Chert)
Chert (Microcrystalline or Cryptocrystalline Silica, SiO2)
sedimentary
Sandstone or Quartzite
Arenite (if sedimentary) / Quartzite (if metamorphic)
Sedimentary or Metamorphic