Dalmation Stone (Dalmation Jasper)
Peralkaline rock (primarily Feldspar and Quartz with Arfvedsonite spots)
igneous
Category
Sedimentary Rock (Cryptocrystalline Quartz)
Browse sedimentary rock (cryptocrystalline quartz) specimens identified by the Rock Identifier community.
Granite
Granite (a plutonic igneous rock composed of quartz, feldspar, and mica)
igneous
Dalmatian Stone (Dalmatian Jasper)
Peralkaline Quartz-Feldspar Porphyry with Arfvedsonite
igneous
Jasper and Chert Conglomerate
Ferruginous Microcrystalline Quartz (SiO2)
sedimentary
Sandstone or Siltstone
Arenite (if sandstone)
Sedimentary
Quartz
Silicon Dioxide (SiO2)
Mineral
Geode with Quartz and Chalcedony
Silicon Dioxide (SiO2)
sedimentary
Banded Gneiss
Gneiss (High-grade Regional Metamorphic Rock)
metamorphic
Quartzite
Quartzite (primarily SiO₂)
metamorphic
Jasper
Silicon Dioxide (SiO2) with iron and magnesium inclusions
sedimentary
Amethyst
Amethyst (Silicon Dioxide - SiO2 with iron impurities)
mineral
Sandstone (with cross-bedding)
Arenite (composed primarily of Quartz: SiO2)
sedimentary
Shale
Lutaceous sedimentary rock
sedimentary
Green Moss Agate / Jasper
Silicon Dioxide (SiO2) - Microcrystalline Quartz with Iron and Manganese inclusions
sedimentary
Quartz with Mica Schist (Pegmatite Specimen)
SiO2 (Silicon Dioxide) and Phyllosilicates (Biotite/Muscovite)
Igneous/Metamorphic Hybrid
Sandstone
Arenite (SiO2 based clastic rock)
sedimentary
Manganese-coated Sandstone
Clastic sedimentary rock with Manganese Oxide (often Pyrolusite or Psilomelane)
sedimentary
Graywacke with Quartz Vein
Lithic Sandstone (Graywacke)
sedimentary
Gneiss
Gneiss
metamorphic
Banded Calcite (often sold as 'Mexican Onyx' or 'Green Onyx')
Calcite (Calcium Carbonate, CaCO3)
Sedimentary
Chert Nodules in Limestone
Cryptocrystalline Quartz (SiO2) within Calcium Carbonate (CaCO3)
sedimentary
Sandstone
Arenite (composed primarily of Quartz: SiO2)
sedimentary
Gold Ore in Quartz/Schist
Auriferous Quartz and Sulfide-bearing Schist
Metamorphic/Igneous (Hydrothermal)
Auriferous Quartz (Gold-bearing Quartz)
Silicon Dioxide (SiO2) with Elemental Gold (Au)
mineral
Sandstone (with Iron Staining)
Clastic sedimentary rock (High Silica / Iron Oxide)
sedimentary
Quartzite River Rock
Quartzite (primarily SiO2)
metamorphic
Shiva Lingam
Cryptocrystalline Quartz (Jasper/Chalcedony) with Iron Oxide inclusions
sedimentary
Quartz / Common Opal Transition
Silicon Dioxide (SiO2)
mineral
Gneiss (Metamorphic Rock)
Gneiss (high-grade regional metamorphic rock)
metamorphic
Quartz (Milky or Iron-Stained)
Silicon Dioxide (SiO2)
mineral
Geode with Quartz Crystal Cavity
Silicon Dioxide (SiO2) in Calcareous/Siliceous Matrix
sedimentary
Dalmatian Stone
Peralkaline Quartz-Feldspar Porphyry with Arfvedsonite
igneous
Smoky Quartz on Feldspar (Granite Pegmatite)
Silicon Dioxide (SiO2) with Potassium Aluminum Silicate (KAlSi3O8)
igneous
Amethyst Geode
Silicon Dioxide with trace inclusions of Iron (SiO2)
mineral
River Quartzite / Tumble-Polished Quartz
Quartzite (SiO2)
metamorphic
Geode (Unopened)
Silica-lined Vug (primarily SiO2)
sedimentary
Sandstone Pebble with Iron Staining
Clastic Sedimentary Rock (primarily Quartz with Fe2O3 oxides)
sedimentary
Red Jasper (in Quartz/Chalcedony)
Silicon Dioxide (SiO2) with iron oxide inclusions
sedimentary
Geode with Iron-Stained Quartz/Calcite
Silicon Dioxide (SiO2) or Calcium Carbonate (CaCO3) in Sedimentary Matrix
sedimentary
Quartzite
Quartzite (primarily composed of SiO O₂)
Sedimentary Rock
Granodiorite with Quartz Veining
Granodiorite (containing Plagioclase Feldspar, Quartz, and Biotite/Hornblende) with Quartz (SiO2) veins
igneous
Red Jasper
Jasper (Silicon Dioxide, SiO2)
sedimentary