Quartz (Milky Quartz)
Silicon Dioxide (SiO2)
mineral
Category
The Purple Specimen Is A Mineral (Amethyst); The White Specimen Is A Sedimentary Rock (Limestone Or Marble).
Browse the purple specimen is a mineral (amethyst); the white specimen is a sedimentary rock (limestone or marble). specimens identified by the Rock Identifier community.
Chert (Flint Pebbles)
Microcrystalline quartz (SiO2)
sedimentary
![Granite with Quartz Vein (Phaneritic Felsic Igneous Rock (composed of Quartz [SiO2], Feldspar, and Mica)) — igneous](https://media.rockidentification.com/50ebadd6-ed66-4e73-abce-e70c662464c5-thumbnail.jpg)
Granite with Quartz Vein
Phaneritic Felsic Igneous Rock (composed of Quartz [SiO2], Feldspar, and Mica)
igneous
Quartzite with Quartz Geode / Vug
Crystalline Silicon Dioxide (SiO2) in Metamorphic Host
metamorphic
Sandstone (Ferruginous)
Arenite (Siliclastic Sedimentary Rock)
sedimentary
Chert (Common Opal/Jasper variety)
Microcrystalline Quartz (SiO2) with hydration
sedimentary
Green Jasper (with Quartz veining)
Jasper (Silica-rich microcrystalline variety of Quartz), formula: SiO2
sedimentary
Rough Emerald in Matrix
Beryl (Be3Al2Si6O18) with trace Chromium/Vanadium
mineral
River Quartzite / Tumble-Polished Quartz
Quartzite (SiO2)
metamorphic
Agatized Fossil or Chalcedony Nodule
Silicon Dioxide (SiO2) - Cryptocrystalline Quartz
sedimentary
Schist (Micaceous Schist)
Schist (containing mainly Muscovite and Quartz)
metamorphic
Quartz (Milky/Crystalline)
Quartz (Silicon Dioxide, SiO2)
mineral
Honey Calcite
Calcium Carbonate (CaCO3)
mineral
Quartz (Vein Quartz)
Silicon Dioxide (SiO2)
mineral
Quartzite with inclusions
Metamorphic Rock (Mainly SiO2)
metamorphic
Banded Agate (River Stone)
Agate (Silicon Dioxide - SiO2)
mineral
Quartzite
Quartzite (SiO2-dominant rock)
metamorphic
Chert (often called Flint or River Pebble)
Chert (Microcrystalline Quartz, SiO2)
sedimentary
Gneiss (High-grade Metamorphic Rock)
Gneiss (Metamorphic silicate rock)
metamorphic
Lepidolite
Lepidolite (K(Li,Al)3(Al,Si,Rb)4O10(F,OH)2)
mineral
Quartz (likely milky/rose quartz variety)
Quartz (SiO2 - Silicon Dioxide)
Mineral
Chert (Jasper)
Microcrystalline Quartz (SiO2)
sedimentary
Turquoise
Hydrated phosphate of copper and aluminium: CuAl6(PO4)4(OH)8·4H2O
Mineral
Ferruginous Quartz
Silicon Dioxide (SiO2) with Iron Oxide inclusions (Hematite/Goethite)
mineral
Chert (variously known as Flint or River Pebble)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Manganese Oxide Crust on Limestone
Manganese Oxides (e.g., Pyrolusite MnO2 or Romanechite) on CaCO3
sedimentary
Clear Quartz (Rock Crystal)
Silicon Dioxide (SiO2)
mineral
Basalt (Water-worn pebble)
Basalt (Mafic Extrusive Rock)
igneous
Dyed Agate
Chalcedony (Silicon Dioxide, SiO2)
mineral
Quartz (River Stone)
Silicon Dioxide (SiO2)
mineral
Exposed Aggregate Concrete (Pea Gravel)
Concrete with Siliceous Alluvial Gravels
sedimentary (man-made conglomerate)
Druzy Agate (Star-cut Geode Slice)
Silicon Dioxide (SiO2) - Microcrystalline and Macrocrystalline Quartz
mineral
Granite
Phaneritic Igneous Rock (Granite)
igneous
Sodalite
Sodalite (Na8(Al6Si6O24)Cl2)
mineral
Jasper Agate
Chalcedony (Silicon Dioxide - SiO2)
mineral
Quartz Geode (partially opened)
Silicon Dioxide (SiO2) with iron staining
mineral
Amethyst (in jewelry)
Silicon Dioxide (SiO2) with iron impurities
mineral
Ferruginous Quartz Cobble
Silicon Dioxide (SiO2) with Iron Oxide inclusions
mineral
Chert (often called Flint)
Microcrystalline to cryptocrystalline quartz (SiO2)
sedimentary
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Chert Pebble (Jasperoid/Flint)
Silicon Dioxide (SiO2) - cryptocrystalline quartz
Sedimentary
Granite (Dioritic or Hornblende-rich)
Phaneritic Plutonic Felsic to Intermediate Igneous Rock
igneous