Peach Moonstone
Potassium Aluminum Silicate (KAlSi3O8)
mineral
Category
Mineral, Specifically A Rock Fragment
Browse mineral, specifically a rock fragment specimens identified by the Rock Identifier community.
Shell Cameo (Sardonyx Shell)
Cassis madagascariensis (Sardonyx shell)
mineral (biogenic silica/calcium carbonate substrate)
Chert (specifically Flint or Jasper variant)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Carnelian
Carnelian (a variety of Chalcedony, which is a microcrystalline quartz, SiO2)
Mineral (variety of Chalcedony)
Smoky Quartz
Smoky Quartz (SiO2)
Mineral
Geode (Unopened)
Siliceous Geode (SiO2)
sedimentary
Basalt with Iron Oxidation (Lattice/Veined)
Mafic Volcanic Rock (principally Plagioclase and Pyroxene)
igneous
Petrified Wood
Silicified Wood (primarily SiO₂ - Silicon Dioxide)
metamorphic
Shale (Beach-worn)
Laminated Pelite (primarily clay minerals and quartz)
sedimentary
Echinoid Fossil (Sea Urchin)
Echinoidea (specifically likely Schizaster or similar genus), calcium carbonate (CaCO3)
sedimentary
Quartz
SiO₂ (Silicon Dioxide)
Mineral
Bauxite (Laterite Clay)
Bauxite (mixture of Hydrous Aluminum Oxides: Gibbsite Al(OH)3, Boehmite and Diaspore AlO(OH))
sedimentary
Druzy Quartz on Chalcedony Matrix
Silicon Dioxide (SiO2)
mineral
Fossilized Shark Teeth
Carcharhiniformes or Lamniformes species (common mineral: Fluorapatite/Ca5(PO4)3F)
sedimentary (fossilized organic matter)
Quartz Vein Rock
Quartz (Silicon Dioxide, SiO2)
igneous
Chert (Jasper/Flint variety)
Microcrystalline quartz (SiO2)
sedimentary
Druzy Quartz on Host Rock
Silicon Dioxide (SiO2)
mineral
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Chondrite Meteorite
Stony Meteorite (Chondrite)
igneous
Chert (with possible fossils)
Microcrystalline quartz (SiO2)
sedimentary
Green Aventurine
Silicon Dioxide (SiO2) with inclusions of Fuchsite (K(Al,Cr)2(AlSi3O10)(OH)2)
metamorphic
Chert (specifically Flint)
Chert (SiO2)
sedimentary
Chert (specifically Flint)
Silicon Dioxide (SiO2)
sedimentary
Agate (Common Chalcedony)
Silicon Dioxide (SiO2)
mineral
Abalone Shell (Mother of Pearl)
Aragonite (Biogenic Calcium Carbonate, CaCO3)
mineral
Red Jasper
Jasper (Silicon Dioxide, SiO2)
sedimentary
Agate (specifically Oco or Banded Agate)
Agate (a variety of Chalcedony), SiO2 (Silicon Dioxide)
mineral
Chert (Flint/Jasper variety)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Not a rock, mineral, or geological specimen
N/A
Serpentinite
Serpentinite (complex silicate minerals including lizardite, chrysotile, and antigorite: (Mg,Fe)3Si2O5(OH)4)
metamorphic
Quartz (Milky or Iron-Stained)
Silicon Dioxide (SiO2)
mineral
Basalt with Quartz Vein
Mafic Igneous Rock (SiO2 filling)
igneous
Petrified Wood
Silicified wood (Quartz, Chalcedony, or Opal)
sedimentary
Shale
Lutaceous sedimentary rock
sedimentary
Chert Breccia
Brecciated Chert (SiO2)
sedimentary
Coquina Limestone
Biogenic Limestone (Calcium Carbonate, CaCO3)
sedimentary
Hematite
Hematite (Fe2O3)
mineral
Quartz Vein in Host Rock
Hydrothermal Quartz (SiO2) in Slates/Schists
metamorphic
Beryl (likely var. Aquamarine or Goshenite) in Matrix
Beryllium Aluminum Silicate (Be3Al2Si6O18)
mineral
Quartz (specifically a water-worn river pebble)
Silicon Dioxide (SiO2)
Mineral
Banded Agate (specifically Lake Superior Agate type)
Silicon Dioxide (SiO2) - Microcrystalline Chalcedony
mineral
Banded Agate (specifically Lace Agate type)
Silicon Dioxide (SiO2)
mineral