Peridot
Olivine (Magnesium Iron Silicate - (Mg, Fe)2SiO4)
mineral
Category
This Image Does Not Display A Rock, Mineral, Or Geological Specimen. It Shows A Human Hand Wearing A Ring.
Browse this image does not display a rock, mineral, or geological specimen. it shows a human hand wearing a ring. specimens identified by the Rock Identifier community.
Pyrite (on a metal substrate)
Iron Sulfide (FeS2)
mineral
Chert (Jasper)
Microcrystalline Quartz (SiO2) with iron oxide impurities
sedimentary
Sandstone (Ferruginous)
Arenite (composed primarily of SiO2 with Fe2O3 staining)
sedimentary
Green Aventurine
Silicon Dioxide (SiO2) with Fuchsite inclusions
metamorphic
Olivine-bearing Basalt / Scoria
Mafic Igneous Rock (primarily (Mg, Fe)2SiO4)
igneous
Basalt with Quartz/Zeolite Inclusions
Porphyritic Basalt (SiO2 with Aluminosilicates)
igneous
Mica Schist
Mica Schist (primarily Muscovite or Biotite sheet silicates)
metamorphic
Agate Geode
Silicon Dioxide (SiO2) - variety Chalcedony/Quartz
sedimentary
Basalt (Road Aggregate / Crushed Stone)
Aphanitic Mafic Igneous Rock
igneous
Clear Quartz (Rock Crystal)
Silicon Dioxide (SiO2)
mineral
Chert (Quartz Variety)
Silicon Dioxide (SiO2)
sedimentary
K2 Azurite Granite / K2 Stone
Granite (igneous rock) with Azurite inclusions (mineral)
igneous
Druzy Chalcedony/Quartz on Fluorite core
Silicon Dioxide (SiO2) on Calcium Fluoride (CaF2)
mineral
Banded Gneiss
Gneiss (variable mineral composition)
metamorphic
Clear/White Quartz (Rock Crystal)
Silicon Dioxide (SiO2)
mineral
Jasper
Jasper (Silicon Dioxide, SiO2)
sedimentary
Pyrite
Iron Disulfide (FeS2)
mineral
Dragon Blood Jasper (Epidote with Piedmontite or Quartz)
Epidote-rich Quartzite / SiO2 with (Ca2(Al2,Fe)(Si2O7)(SiO4)O(OH))
metamorphic
Green Slag Glass
Amorphous Silica / Glassy Blast Furnace Slag
Mineraloid (Industrial byproduct)
Conglomerate
Clastic sedimentary rock (Conglomerate)
sedimentary
Sandstone
Clastic sedimentary rock (primarily SiO2)
sedimentary
Blue Quartz (Aventurine)
Silicon Dioxide (SiO2) with inclusions of Dumortierite or Magnesio-riebeckite
mineral
Clear Quartz (Rock Crystal)
Silicon Dioxide (SiO2)
mineral
Sunstone
Oligoclase (Plagioclase Feldspar) - (Ca,Na)(Al,Si)4O8 with Hematite or Copper inclusions
mineral
Crinoid Fossil in Limestone
Crinoid (Class Crinoidea) in Fossiliferous Limestone (CaCO3)
sedimentary
Milky Quartz
Quartz (Silicon Dioxide, SiO2)
mineral
Red Sandstone (Iron-Rich)
Arenite (Fe2O3)
sedimentary
Amethyst
Silicon Dioxide (SiO2) with iron impurities
mineral
Basalt with Amygdules
Amygdaloidal Basalt
igneous
Jasper (specifically Fancy or Polychrome Jasper)
Silicon Dioxide (SiO2) - Chalcedony
Sedimentary
Chert (and Chalcedony)
Silicon Dioxide (SiO2)
sedimentary
Amygdaloidal Basalt
Amygdaloidal Basalt (Mafic Volcanic Rock)
igneous
Gneiss
Gneiss (High-grade Metamorphic Rock)
metamorphic
Pyrite on Quartz
Iron Sulfide (FeS2) on Silicon Dioxide (SiO2)
mineral
Fluorite (Purple Octahedron)
Calcium Fluoride (CaF2)
Mineral
Yellow Quartzite Pebble
Quartzite (primarily Silicon Dioxide - SiO2)
metamorphic
Aquamarine
Beryl (Be3Al2Si6O18 with iron impurities)
mineral
Conglomerate
Conglomerate (clastic sedimentary rock)
sedimentary
Quartz Vein in Gneiss or Basalt
Milky Quartz (SiO2) within Metamorphic Host Rock
Metamorphic or Igneous with Mineral Inclusion
Pink Granite
Granite (Phaneritic intrusive rock)
igneous
Bauxite (Pisolitic Bauxite)
Bauxite (mixture of Hydrous Aluminum Oxides)
sedimentary