Quartz (Smoky/Rock Crystal)
Silicon Dioxide (SiO2)
mineral
Category
Biogenic Material
Browse biogenic material specimens identified by the Rock Identifier community.
Learn about Biogenic Material in the encyclopedia
View all →
Petrified Wood
Silicified wood (primarily SiO2)
fossil
Petrified Wood
Silicified Wood (SiO2)
sedimentary
Milky Quartz
Crystalline Silicon Dioxide (SiO2)
mineral
Quartz Vein in Sandstone
Hydrothermal Quartz (SiO2) in Arenite
sedimentary
Blue Goldstone
Auraventurine (Synthetic glass with cobalt and copper inclusions)
Synthetic (Man-made Glass)
Metal Chain Belt with Square Plates
Not applicable (man-made)
Man-made Object (Metalwork)
Diamond (in a jewelry setting)
Cubic Carbon (C)
mineral
Diamond (set in a gold ring)
Carbon (C) - Adamantine cubic carbon
mineral
Diamond
Diamond (C)
mineral
Chert (Arrowhead or Projectile Point)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Possible iron-rich basalt or industrial slag
Basalt, likely Fe–Mg silicate rock; exact identification is uncertain from the blurred image
igneous
Granite
Granite
igneous
Pumice
Pumice (a highly vesicular volcanic rock)
igneous
Basalt
Basalt (Mafic Extrusive Igneous Rock)
igneous
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Quartzite River Rock (with Quartz Vein)
Quartzite (SiO2)
metamorphic
Small vesicular volcanic rock, likely scoria
Scoria; predominantly basaltic to andesitic volcanic rock
igneous
Tumbled pale green aventurine (probable)
Quartz, SiO₂, with dispersed fuchsite or other green inclusions
mineral
Sandstone
Sedimentary Rock (Quartz Sandstone)
sedimentary
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Quartz Pebble
Quartz (Silicon Dioxide, SiO2)
sedimentary
Quartzite Pebble
Metamorphosed Quartz Arenite (SiO2)
metamorphic
Sandstone
Sedimentary Rock (Quartz arenite)
sedimentary
Quartz Pebble
Silicon Dioxide (SiO2)
sedimentary
Sandstone
Quartz Arenite / Clastic Sedimentary Rock
sedimentary
Quartz Pebble
Silicon Dioxide (SiO2)
sedimentary
Pink Granite / K-Feldspar
Alkali feldspar granite / Potassium feldspar (Microcline/Orthoclase)
igneous
Fossilized Coral
Rugosa or Tabulate Coral Fossil (Replacement by Silica/Calcite)
fossil
Sandstone
Clastic Sedimentary Rock
sedimentary
Sandstone
Quartz Arenite / Clastic Sedimentary Rock
sedimentary
Olivine
(Mg,Fe)2SiO4
mineral
Sandstone
Clastic sedimentary rock composed mainly of quartz sand
sedimentary
Quartz-bearing Pegmatite with Metallic Sulfides
Pegmatite / Quartz-Feldspar Matrix with Pyrite and Mica
igneous
Quartz Pebble
Silicon Dioxide (SiO2)
sedimentary
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Botryoidal Chalcedony / Quartz
Silicon Dioxide (SiO2)
mineral
Sandstone
Clastic Sedimentary Rock
sedimentary
Quartz Pebble
Silicon Dioxide (SiO2)
sedimentary
Quartz Boulder
Silicon Dioxide (SiO2)
mineral
Sandstone
Sedimentary Rock (Quartz arenite)
sedimentary
Red Sandstone
Quartzose Sandstone (primarily quartz grains cemented by iron oxides)
sedimentary