Epidote with Quartz and Feldspar
Ca2(Al2,Fe3+)(SiO4)3(OH) (Epidote complex)
Category
Browse mineral (variety of quartz) specimens identified by the Rock Identifier community.
Epidote with Quartz and Feldspar
Ca2(Al2,Fe3+)(SiO4)3(OH) (Epidote complex)
Banded Agate (specifically Lake Superior Agate style)
Silicon Dioxide (SiO2) - Chalcedony variety
Rough Corundum (likely Sapphire/Zircon-bearing)
Aluminium Oxide (Al2O3)
Dyed Agate Slice
Silicon Dioxide (SiO2) - Cryptocrystalline Quartz
Granite
Phaneritic Igneous Rock (primarily Quartz, Feldspar, and Mica)
Jasper (specifically Polychrome or Desert Jasper)
Silicon Dioxide (SiO2) with iron oxide and other mineral impurities
Chert (Iron-stained)
Chert (Microcrystalline Quartz, SiO2)
Amethyst
Quartz variety; chemical formula: SiO₂ (silicon dioxide) with Fe³⁺ impurities
Smoky Quartz
Silicon Dioxide (SiO2)
Agate
Silicon Dioxide (SiO2) - Chalcedony variety
Green Agate
Silicon dioxide (SiO₂)
Milky Quartz or Moonstone
Silicon Dioxide (SiO2) or Potassium Aluminum Silicate (KAlSi3O8)
Carnelian (a variety of Chalcedony)
SiO2 (Silicon Dioxide) - Cryptocrystalline Quartz
Red Quartzite
Quartzite (primarily SiO2)
Coarse-grained Granite
Granitoid (Felsic Plutonic Rock)
Chert (with Quartz Vein)
Chert (Siliceous sedimentary rock, predominantly Microcrystalline Quartz SiO2)
Amethyst (Pale/Light Variety)
Quartz (Silicon Dioxide) with Iron impurities - SiO2
Chert (Flint)
Microcrystalline Quartz (SiO2)
Chert (Jasper)
Silicon Dioxide (SiO2)
Agate (Moss or Banded Agate variety)
Agate (Silicon Dioxide - SiO2)
Orthoclase Feldspar
KAlSi3O8 (Potassium Aluminum Silicate)
Smoky Quartz
Silicon Dioxide (SiO2) with aluminum impurities and natural irradiation
Chert (Flint)
Chert (Microcrystalline or cryptocrystalline Quartz, SiO2)
Green Jasper
Silicon Dioxide (SiO2) with impurities
Quartz (Pinkish-Orange Variety)
Crystalline Silicon Dioxide (SiO2)
Quartz (on matrix)
Quartz (Silicon Dioxide, SiO₂)
Chert (Nodule)
Silicon Dioxide (SiO2)
Greywacke
Lithic wacke (variety of Sandstone)
Quartz (Drusy/Crystalline variety)
Silicon Dioxide (SiO2)
Red Sandstone
Sandstone (mainly SiO2 with Iron Oxide cement)
Yellow Calcite
Calcite (Calcium Carbonate, CaCO3)
BROWN GRANITE (likely 'Tan Brown' or similar)
Granite (specifically a variety rich in orthoclase feldspar, often with biotite and possibly hornblende)
Ferruginous Quartz
Quartz (Silicon Dioxide, SiO2) with iron oxide inclusions
Picture Jasper (specifically Biggs or Deschutes variety)
Silicon Dioxide (SiO2) - Cryptocrystalline Quartz
Labradorite (Feldspar)
Labradorite: (Ca,Na)(Al,Si)4O8
Green Aventurine
Silicon Dioxide (SiO2) with Fuchsite inclusions
Amethyst Lace Agate / Banded Amethyst
Silicon Dioxide (SiO2) with Fe3+ impurities
Chert (Flint)
Chert (Silicon Dioxide, SiO2)
Polished River Jasper
Silicon Dioxide (SiO2) with iron and other mineral inclusions
Zebra Jasper
Tektite variety of Silicon Dioxide (SiO2) with inclusions
Chalcedony (Agate/Carnelian variety)
Cryptocrystalline Quartz (SiO2)
Banded Agate (Carnelian variety)
Cryptocrystalline Quartz (SiO2)