Quartz (Milky or Smoky)
Silicon Dioxide (SiO2)
mineral
Community gallery
All rocks & minerals
Every specimen the Rock Identifier community has discovered, from desert agates to deep-sea basalts.
Quartz (Milky or Smoky variant)
Silicon Dioxide (SiO2)
mineral
Chert (Flint)
Microcrystalline Quartz (SiO2)
sedimentary
Pink Granite
Phaneritic Felsic Intrusive Igneous Rock
igneous
Conglomerate
Conglomerate / Lithic Wacke
sedimentary
Pyrite in Quartz
Silicon Dioxide (SiO2) with Iron Sulfide (FeS2)
mineral
Milky Quartz
Quartz (Silicon Dioxide, SiO2)
mineral
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Sandstone
Arenite (primarily Quartz Arenite)
sedimentary
Marble
Recrystallized Carbonate Rock (CaCO3)
metamorphic
Marble
Recrystallized Calcite (CaCO3)
metamorphic
Quartz
Silicon Dioxide (SiO2)
mineral
Gneiss
Foliated Metamorphic Gneiss
metamorphic
Granodiorite
Granodiorite (NaCa0.5(AlSi3O8)2(Fe,Mg)2)
igneous
Potassium Feldspar (Orthoclase)
KAlSi3O8
mineral
Quartzite
SiO2 (Metamorphosed Sandstone)
metamorphic
Sandstone
Arenite (primarily SiO2)
sedimentary
River Cobble (Gneiss/Schist mix)
Foliated Metamorphic Rock (Gneissic/Schistose)
metamorphic
Quartzite River Rock
Quartzite (primarily SiO2)
metamorphic
Sandstone
Arenite (SiO2 principal component)
sedimentary
Quartzite Pebbles or River Rock
Quartzite / Microcrystalline Quartz (SiO2)
sedimentary
Quartzite Pebble
Metamorphosed Quartz Sandstone (SiO2)
metamorphic
Quartzite Pebble
Metamorphosed Sandstone (mainly SiO2)
metamorphic
Chert (River Siltstone/Flint)
Chert (SiO2)
sedimentary
Scoria
Scoria (Extrusive Volcanic Rock)
igneous
Satin Spar (Selenite)
Calcium sulfate dihydrate (CaSO4·2H2O)
mineral
Quartz Crystal Point
Silicon Dioxide (SiO2)
mineral
Unakite
Unakite (Epidotized Granite)
metamorphic
Chert (Jasper)
Silicon Dioxide (SiO2)
sedimentary
Banded Gneiss
Gneiss (High-grade regional metamorphic rock)
metamorphic
Quartz (Small Fragment)
Silicon Dioxide (SiO2)
mineral
Basalt
Aphanitic Mafic Igneous Rock
igneous
Quartz (Small Pebble)
Silicon Dioxide (SiO2)
mineral
Magnetite (in matrix)
Magnetite (Fe3O4)
mineral
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Basalt with Epidote
Mafic volcanic rock with Epidote (Ca2(Al2,Fe3+)(SiO4)(Si2O7)O(OH))
igneous
Granite
Granite (Phaneritic intrusive igneous rock)
igneous
Chert (Jasper/Common Chert Pebble)
Microcrystalline Quartz (SiO2)
sedimentary
Granite Pebble
Granite (Phaneritic intrusive igneous rock)
igneous
Chert (Iron-stained)
Silicon Dioxide (SiO2)
sedimentary
Granite Pebble
Granite (composed primarily of Quartz: SiO2, Feldspar: KAlSi3O8, and Mica: K(Mg,Fe)3AlSi3O10(OH)2)
igneous
Scoria
Scoriaceous Basalt
igneous