Granite Pebble
Granite (Felsic intrusive igneous rock)
igneous
Category
Synthetic (Not A Rock Or Mineral)
Browse synthetic (not a rock or mineral) specimens identified by the Rock Identifier community.
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Quartz Vein in Amphibolite / Gneiss
Quartz (SiO2) in Mafic Metamorphic Host Rock
metamorphic
Jasper and Epidote Breccia
Silicified Brecciated Rock with Epidote
metamorphic
Banded Greywacke
Greywacke (Lithic wacke)
sedimentary
Granite
Plutonic felsic rock (Quartz, Feldspar, Mica)
igneous
Sandstone Concretion
Sedimentary Concretion (Quartz sand bound by mineral cement)
sedimentary
Sandstone (River Cobble)
Sandstone (principally composed of Quartz, SiO2)
sedimentary
Quartz Pebble
Silicon Dioxide (SiO2)
sedimentary
Gneiss
Gneiss (Metamorphic Rock)
metamorphic
Granite
Granite
igneous
Ulexite
NaCaB5O6(OH)6·5H2O
mineral
Mixed mineral and rock collection
Predominantly quartz varieties, including amethyst, plus likely calcite, feldspar, mica, and miscellaneous polished stones
mineral
Sandstone
Sedimentary Rock (Quartz arenite)
sedimentary
Sandstone (Common Quartz Pebble/Rock)
Sedimentary rock / Quartz arenite
sedimentary
Geode or Concretion
Silica-filled nodule (likely SiO2)
sedimentary
Quartz Geode
Silicon Dioxide (SiO2)
mineral
Chert Breccia (Yellow Jasper)
Silicon Dioxide (SiO2) - Brecciated Chert
sedimentary
Sandstone
Clastic Sedimentary Rock
sedimentary
Sandstone (Banded)
Clastic sedimentary rock (primarily SiO2)
sedimentary
Schist
Mica Schist (primarily consisting of muscovite KAl2(AlSi3O10)(OH)2 or biotite K(Mg,Fe)3(AlSi3O10)(OH)2)
metamorphic
Sandstone
Sedimentary Rock (Quartz arenite / Lithic sandstone)
sedimentary
Amygdaloidal Basalt
Amygdaloidal Basalt (Mafic Volcanic Rock)
igneous
Gneiss
High-grade regional metamorphic rock (Foliated)
metamorphic
Banded Gneiss
Gneiss (Metamorphic Rock)
metamorphic
Amygdaloidal Basalt with Epidote/Chlorite
Basalt (containing (Ca2(Al2Fe3+)(SiO4)(Si2O7)O(OH)))
igneous
Granite
Phaneritic Plutonic Felsic Rock
igneous
Mixed rock and mineral collection
Multiple specimens; visible examples may include quartz (SiO₂), amethyst (quartz), calcite (CaCO₃), and dark mafic rocks
mineral
Mixed Mineral and Rock Collection
Mixed geological specimens (Quartz, Amethyst, Rose Quartz, Jasper, Epidote, Chert)
mineral
Quartzite with Epidote Vein
Metamorphosed Quartz Sandstone with Hydrothermal Vein
metamorphic
Agate
Agate (Silicon Dioxide, SiO2)
mineral
Sandstone
Sandstone (Quartz-rich sedimentary rock)
sedimentary
Orbicular Jasper (Ocean Jasper)
Silicon Dioxide (SiO2) with various inclusions
mineral
Sandstone
Arenite (SiO2 principal composition)
sedimentary
Sandstone
Arenite (SiO2 primarily)
sedimentary
Quartz Veined Mudstone
Metasedimentary rock with Quartz (SiO2) veins
metamorphic
Agate / Chalcedony Geode
Silicon Dioxide (SiO2)
sedimentary
Feldspar-Quartz Rock (likely Pegmatite or Granite)
Feldspar-Quartz composite rock (KAlSi3O8 - SiO2)
igneous
Sandstone (with possibly iron oxides and other minerals)
Sandstone
Sedimentary rock
Basalt
Basalt (Mafic Extrusive Igneous Rock)
igneous
Gneiss
Banded orthogneiss or paragneiss, typically quartz–feldspar–mica bearing
metamorphic
Yellow Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Mixed rock and mineral collection
Multiple specimens; visible pieces may include quartz, calcite, agate/chalcedony, jasper, and dyed or coated materials
mineral