Unakite
Epidotized Granite
metamorphic
Category
Not A Rock (Man Made Polymer)
Browse not a rock (man made polymer) specimens identified by the Rock Identifier community.
Quartzite River Rock
Quartzite (primarily SiO2)
metamorphic
Sandstone or Quartzite
Arenite (if sedimentary) / Quartzite (if metamorphic)
Sedimentary or Metamorphic
Sandstone (Glacial Cobble)
Arenite / Sedimentary Rock (primarily SiO2)
sedimentary
Quartz Geode
Silicon Dioxide (SiO2) in Geode form
sedimentary
Sandstone (with Iron Staining)
Clastic sedimentary rock (SiO2 with Fe2O3 oxides)
sedimentary
Vesicular Basalt with Epidote
Vesicular Basalt (Mg, Fe)2SiO4 with Epidote (Ca2(Al2,Fe)(SiO4)(Si2O7)O(OH))
igneous
Quartzite with Hematite staining
Quartzite (SiO2) with iron oxide inclusions
metamorphic
Quartzite (River Pebble)
Meta-quartzite (composed primarily of SiO2)
metamorphic
Yellow Quartzite (River Pebble)
Quartzite (primarily Silicon Dioxide, SiO2)
metamorphic
Quartz Druzy (on Matrix)
Silicon Dioxide (SiO2)
mineral
Pink Granite
Phaneritic Felsic Igneous Rock (Granite, rich in Potassium Feldspar)
igneous
Dalmatian Jasper / Dalmatian Stone
Peralkaline Rock (Silicon Dioxide with Amphibole inclusions)
igneous
Quartzite
Quartzite (primarily SiO2)
metamorphic
Serpentine
Antigorite, Lizardite, or Chrysotile (Mg, Fe)3Si2O5(OH)4
metamorphic
Sandstone (Ferruginous)
Arenite with Iron Oxide (Limonite/Hematite) coating
sedimentary
Milky Quartz
Quartz (Silica / Silicon Dioxide), SiO2
mineral
Fossiliferous Limestone (Coquina)
Biogenic Limestone (Calcium Carbonate, CaCO3)
sedimentary
Shale
Fissile Siliciclastic Sedimentary Rock
sedimentary
Agate
Silicon Dioxide (SiO2) - variety Chalcedony
mineral
Agate (specifically a Yellow/Honey Agate)
Silicon Dioxide (SiO2) - Microcrystalline Quartz
mineral
Unknown Rock Specimen
igneous
Granodiorite or Diorite
Granodiorite / Diorite
igneous
Quartz in Matrix (possibly Basalt or Siltstone host)
Silicon Dioxide (SiO2) in Host Rock
mineral
Quartz-veined Mudstone or Argillite
SiO2 (Quartz) in Siltstone/Mudstone matrix
sedimentary
Quartz (Druzy)
Silicon Dioxide (SiO2)
mineral
Sandstone
Clastic sedimentary rock (primarily SiO2)
sedimentary
Basalt
Basalt (Aphanitic-fine grained mafic igneous rock)
igneous
Quartz Vein in Host Rock
Quartz (SiO2) in Mafic or Sedimentary Matrix
igneous
Sandstone
Arenite
sedimentary
Sandstone
Sandstone (clastic sedimentary rock)
Rock
Quartz Vein in Sandstone
Sandstone with Hydrothermal Quartz (SiO2)
sedimentary
Basalt (Amygdaloidal)
Amygdaloidal Basalt
igneous
Sandstone with Quartz Veins
Arenite (primarily SiO2 with Fe2O3 staining)
sedimentary
Botryoidal Chalcedony (Desert Rose / Agate)
Silicon Dioxide (SiO₂)
Mineral variant
Basalt
Basalt
igneous
Banded Slate or Siltstone with Quartz/Calcite Veins
Protolith-derived Siltstone or Slate (varies based on degree of metamorphism)
metamorphic
River Pebble (Gravel)
Clastic sedimentary rock (likely Siltstone or Mudstone pebble; SiO2 with various impurities)
sedimentary
Diorite
Diorite (Intermediate intrusive igneous rock)
igneous
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Sandstone with Quarzite clasts
Arenite (SiO2 based)
sedimentary
Chert (Agatized/Chalcedony variety)
Microcrystalline Quartz (SiO2)
sedimentary