Amethyst
Silicon dioxide (SiO2) with iron impurities
mineral
Community gallery
All rocks & minerals
Every specimen the Rock Identifier community has discovered, from desert agates to deep-sea basalts.
Milky Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Granite Pebble
Phaneritic Felsic Igneous Rock
igneous
Sandstone (likely Arkosic or Lithic Sandstone)
Sandstone (SiO2 predominant)
sedimentary
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Milky Quartz
Quartz (Silicon Dioxide, SiO2)
mineral
Quartz
Silicon Dioxide (SiO2)
mineral
Basalt Porphyry
Porphyritic Basalt
igneous
Fossiliferous Limestone
Calcium Carbonate (CaCO3) with Bioclasts
sedimentary
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Banded Agate
Agate (Silicon Dioxide, SiO2)
mineral
Gneiss
Gneiss (High-grade metamorphic rock)
metamorphic
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Diorite
Diorite (Intermediate intrusive igneous rock)
igneous
Sandstone (Pebble)
Arenite (primarily SiO2)
sedimentary
Gneiss (Granite Gneiss)
Gneiss
metamorphic
Sunstone
(Ca,Na)(Al,Si)4O8 (Oligoclase or Andesine)
mineral
Sunstone
(Ca,Na)((Al,Si)2Si2O8) - Plagioclase Feldspar
mineral
River Stone (likely Basalt or Greywacke)
Basalt with mineral veining
igneous
Milky Quartz Pebble
Quartz (Silicon Dioxide - SiO2)
mineral
Chert (Jasper)
Cryptocrystalline Silicon Dioxide (SiO2)
sedimentary
Yellow Jasper
Silicon Dioxide (SiO2) with Goethite/Iron Oxide inclusions
sedimentary
Sandstone (Quartzose)
Arenite (SiO2 based)
sedimentary
River Stone (Basalt or fine-grained Schist)
Mafic Igneous Rock / Volcanic Basalt
igneous
Quartzite Pebble
Metamorphic Quartz (SiO2)
metamorphic
Sandstone (Red Sandstone)
Arenite
sedimentary
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Granite Pebble
Granite (Felsic Intrusive Igneous Rock)
igneous
River Pebble (Gneiss or Granite)
Metamorphic Rock (likely Gneiss or Granitic composition)
metamorphic
Granite
Phaneritic Igneous Rock (Granite)
igneous
Basalt Pebble
Mafic Igneous Rock (Basalt)
igneous
Jasper
Jasper (Silicon Dioxide, SiO2)
sedimentary
Basalt
Basalt (principally Plagioclase Feldspar and Pyroxene)
igneous
Fossiliferous Limestone
Calcium Carbonate (CaCO3) with fossil inclusions
sedimentary
Quartzite
Quartzite (primarily SiO2)
metamorphic
Quartzite
Quartzite (primarily SiO2)
metamorphic
Red Jasper
Chalcedony/Quartz (SiO2) with iron inclusions
mineral
Quartzite Pebble
Quartzite (principally SiO2)
metamorphic
Quartzite Pebble
Metamorphosed Sandstone (SiO2)
metamorphic