Small vesicular volcanic rock, likely scoria
Scoria; predominantly basaltic to andesitic volcanic rock
igneous
Category
Synthetic Polymer (Synthetic Material)
Browse synthetic polymer (synthetic material) specimens identified by the Rock Identifier community.
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Sandstone
Clastic Sedimentary Rock
sedimentary
Quartz Pebble
Silicon Dioxide (SiO2)
sedimentary
Pebble
Lithic fragment / Water-worn rock
sedimentary
Sandstone
Sedimentary Rock (Quartz arenite)
sedimentary
Red Sandstone
Quartzose Sandstone (primarily quartz grains cemented by iron oxides)
sedimentary
Quartz Pebble
Silicon Dioxide (SiO2)
sedimentary
Sandstone with Iron Weathering
Quartz Arenite / Weathered Sandstone
sedimentary
Quartz Boulder
Silicon Dioxide (SiO2)
mineral
Conglomerate
Clastic sedimentary rock (Conglomerate)
sedimentary
Sandstone Pebble
Sandstone (SiO2 rich clastic rock)
sedimentary
Red Sandstone
Quartz Arenite (iron-stained)
sedimentary
Unakite
Altered Granite (Epidotized Granite)
metamorphic
Sandstone (Quartzose Sandstone)
Sandstone (SiO2 dominant composition)
sedimentary
Gravel / Limestone Fragment
Calcium Carbonate (CaCO3) / Fine-grained Sedimentary Rock
sedimentary
Quartzite pebble
Metamorphic Quartzite (SiO2)
metamorphic
Quartzite (or Quartz)
SiO2 (Silicon Dioxide)
metamorphic
Limestone Pebble
Sedimentary Calcium Carbonate (CaCO3)
sedimentary
Quartz (Milky Quartz / Quartz Crystal)
Silicon Dioxide (SiO2)
mineral
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Granite
Granite (Plutonic Igneous Rock)
igneous
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
Clastic Sedimentary Rock
sedimentary
Sandstone
Quartz Arenite / Clastic Sedimentary Rock
sedimentary
Sandstone
Sedimentary Rock (Quartz arenite)
sedimentary
Quartz Pebble
Silicon Dioxide (SiO2)
sedimentary
Quartz-bearing Pegmatite with Metallic Sulfides
Pegmatite / Quartz-Feldspar Matrix with Pyrite and Mica
igneous
Quartz Pebble
Silicon Dioxide (SiO2)
sedimentary
Botryoidal Chalcedony / Quartz
Silicon Dioxide (SiO2)
mineral
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
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Olivine
(Mg,Fe)2SiO4
mineral
Sandstone
Clastic sedimentary rock composed mainly of quartz sand
sedimentary
Spherulitic Agate / Moss Agate
Chalcedony (SiO2) with mineral inclusions
mineral
Sandstone Pebble
Arenite (Siliclastic sedimentary rock)
sedimentary
Quartzite Pebble
Quartzite (SiO2)
metamorphic