Fossil Coral
Fossilized Scleractinia or Tabulata (various genera/species)
Category
Browse sedimentary (secondary classification for a weathered mineral specimen) specimens identified by the Rock Identifier community.
Fossil Coral
Fossilized Scleractinia or Tabulata (various genera/species)
Chert (Yellow Jasper/Flint)
Silicon Dioxide (SiO2)
Blue Apatite
Apatite (Calcium Phosphate) - Ca5(PO4)3(F,Cl,OH)
Agate
Agate (Cryptocrystalline Variety of Quartz, SiO2)
Dzi Bead (Etched Chalcedony)
Cryptocrystalline Quartz (SiO2) with chemical etching
Banded Chert (River Pebble)
Microcrystalline Quartz (SiO2)
Chert (and Petrified Wood)
Silicon Dioxide (SiO2)
Quartz (Iron-stained)
Silicon Dioxide (SiO2)
Cryptocrystalline Quartz (Agate/Chert)
Silicon dioxide (SiO2)
Milky Quartz
Quartz (Silicon Dioxide, SiO2)
Basalt
Basalt (Aphanitic Mafic Igneous Rock)
Mica Schist
Muscovite Schist (KAl2(AlSi3O10)(OH)2)
Laterite
Laterite (Iron/Aluminum-rich oxide)
Sandstone (specifically Double Arch in Arches National Park)
Entrada Sandstone
Basalt
Basalt
Chert (variations include Flint/Jasper)
Chert (SiO2)
Quartzite
Quartzite (primarily SiO2)
Sapphire
Corundum (Al2O3)
Chert (Jasper variety)
Microcrystalline Quartz (SiO2)
Milky Quartz
Quartz (SiO2)
Blue Agate (Dyed Chalcedony)
Silicon Dioxide (SiO2)
Granite (Specimen: Logan Rock)
Phaneritic plutonic igneous rock (mainly Quartz, Feldspar, and Mica)
Chert (Iron-stained)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
Granite
Granite (Felsic Plutonic Rock)
Banded Chert
Microcrystalline Quartz (SiO2)
Quartz Pebble
Quartz (Silicon Dioxide, SiO2)
Granodiorite Pebble
Granodiorite (containing Quartz, Plagioclase Feldspar, and Biotite/Amphibole)
Quartz (Milky Quartz)
Silicon Dioxide (SiO2)
Quartz
Silicon Dioxide (SiO2)
Picture Jasper
Silicon Dioxide (SiO2) with iron oxide and clay inclusions
White Quartz Pebble
Silicon Dioxide (SiO2)
Gold Nugget
Native Gold (Au)
Chert (specifically Yellow/Honey Jasper variety)
Cryptocrystalline Quartz (SiO2)
Quartzite
Quartzite (primarily SiO2)
Gneiss with Quartz Veining
Gneiss (High-grade regional metamorphic rock)
Quartz Crystal
Quartz (SiO₂)
Jasper (Red/Yellow)
Silicon Dioxide (SiO2) with impurities
Amazonite
Microcline (KAlSi3O8) with Pb impurities
Amethyst
Quartz (Silicon Dioxide with Iron impurities), SiO2
Amazonite
KAlSi3O8 (Potassium aluminum silicate - blue-green variety of Microcline)
Sunstone
Plagioclase Feldspar (Na,Ca)(Al,Si)4O8
Amazonite
Potassium Aluminum Silicate (KAlSi3O8)