Heliotrope (Bloodstone)
Cryptocrystalline Quartz (SiO2) with inclusions of Hematite (Fe2O3)
Category
Browse igneous and sedimentary specimens identified by the Rock Identifier community.
Heliotrope (Bloodstone)
Cryptocrystalline Quartz (SiO2) with inclusions of Hematite (Fe2O3)
Gneiss
Gneiss
Gneiss
Gneiss (High-grade Metamorphic Rock)
Gneiss (Banded Gneiss)
Gneiss
Chalcedony (Smoky Quartz or Agate nodule fragment)
Silicon Dioxide (SiO2)
Chalcedony (Agate/Carnelian precursor)
Chalcedony (Silicon Dioxide, SiO2)
Specular Hematite
Hematite (Fe2O3)
Epidote
Epidote; Ca2(Al2,Fe3+)(SiO4)(Si2O7)O(OH)
Druzy Quartz (part of a Geode)
Silicon Dioxide (SiO2)
Epidote with Magnetite/Hematite inclusions
Epidote (Ca2(Al2,Fe3+)(SiO4)3(OH)) with Iron Oxides
Gneiss
High-grade regional metamorphic rock (Foliated)
Chalcedony with inclusions (Agate/Quartz)
Silicon Dioxide (SiO2)
Biotite Gneiss
Gneiss (complex mixture including Biotite K(Mg,Fe)3AlSi3O10(F,OH)2 and Quartz/Feldspar)
Quartz Geode Fragment
Silicon Dioxide (SiO2)
Nuummite
Nuummite (Orthoamphibole rock / Anthophyllite-Gedrite blend)
Amethyst
Amethyst (Silicon Dioxide - SiO2 with iron impurities)
Grey River Stone (Gneiss/Schist mix)
Foliated Metamorphic Rock (variable mineral formula)
Botryoidal Agate / Chalcedony Geode
Silicon Dioxide (SiO2)
Common Opal
Hydrated Amorphous Silica (SiO2·nH2O)
Gneiss
Gneiss
Gneiss (specifically a water-worn pebble)
Gneiss
Banded Gneiss
Gneiss (complex metamorphic silicate rock)
Gneiss
High-grade metamorphic rock (Gneiss)
Quartz (Druzy/Macro-crystalline)
Silicon Dioxide (SiO2)
Gneiss
Gneiss
Quartz / Quartz Geode fragment
Silicon Dioxide (SiO2)
Common Opal in Host Rock
Hydrated Silica (SiO2·nH2O)
Botryoidal Chalcedony (Agate/Desert Rose Chalcedony)
Silicon Dioxide (SiO2) - Cryptocrystalline Quartz
Gneiss (with Quartzite and Biotite)
Gneiss containing SiO2 (Quartz), K(Mg,Fe)3AlSi3O10(OH)2 (Biotite), and (K,Na,Ca)AlSi3O8 (Feldspar)
Gneiss
Gneiss (High-grade Metamorphic Rock)
Gneiss
Gneiss
Quartz Druzy (on Calcedony/Quartz base)
Silicon Dioxide (SiO2)
Gneiss
Gneiss
Banded Gneiss (with Quartz Vein)
Gneiss (Metamorphic rock of varying mineralogy)
Gneiss
Gneiss (High-grade metamorphic rock)
Quartz Geode
Silicon dioxide (SiO2)
Gneiss (specifically Banded Gneiss)
Gneiss
Banded Gneiss
Gneiss (Metamorphic high-grade, predominantly SiO2, Al2O3, K2O, Na2O)
Gneiss (specifically Micaceous Gneiss)
Gneiss (High-grade Regional Metamorphic Rock)
Banded Gneiss
Gneiss (High-grade Metamorphic Rock)
Gneiss (with Mica and Quartz)
Gneissic Metamorphic Rock
Gneiss
Gneiss