Smoky Quartz with Amethyst
Silicon Dioxide (SiO2)
mineral
Category
Not A Geological Specimen
Browse not a geological specimen specimens identified by the Rock Identifier community.
Learn about Not A Geological Specimen in the encyclopedia
View all →
Vesicular Basalt (Amygdaloidal)
Amygdaloidal Basalt
igneous
Petoskey Stone
Hexagonaria percarinata
sedimentary
Almandine Garnet in Matrix
Almandine, Fe3Al2(SiO4)3
metamorphic
Ruby Zoisite
Anyolite (Calcium aluminium silicate with Chromium/Corundum inclusions)
metamorphic
Common Opal
Hydrated Silica (SiO2·nH2O)
mineral
Ocean Jasper
Silicon Dioxide (SiO2) with iron and other mineral inclusions
mineral
Chalcopyrite
Copper Iron Sulfide (CuFeS2)
mineral
Jasper with Quartz vein
Silicon Dioxide (SiO2) - Microcrystalline Quartz
sedimentary
Citrine
Silicon Dioxide (SiO2) with iron impurities
mineral
Amazonite
Microcline (KAlSi3O8) with Trace Lead
mineral
Beryl in Quartz Matrix
Beryllium Aluminum Silicate (Be3Al2Si6O18)
mineral
Smoky Quartz
Silicon Dioxide (SiO2)
mineral
Orbicular Jasper
Silicon Dioxide (SiO2)
sedimentary
Tiger's Eye (and Hematite/Jasper Matrix)
SiO2 (Pseudomorph of Quartz after Crocidolite) with Hematite/Magnetite
mineral
Goethite
Goethite (FeO(OH))
mineral
Amethyst
Crystalline Silicon Dioxide with Iron impurities (SiO2)
mineral
Amethyst (specifically Chevron Amethyst or Dream Amethyst)
Silicon Dioxide (SiO2) with iron impurities
mineral
Amethyst
Silicon Dioxide (SiO2) with iron impurities
mineral
Milky Quartz
Quartz (Silicon Dioxide, SiO2)
mineral
White Precious Opal
Hydrated Silica (SiO2·nH2O)
mineral
Amethyst
SiO2 (Silicon Dioxide with Iron impurities)
mineral
Que Sera Stone (Llanite)
Rhyolite Porphyry with Blue Quartz and Feldspar
igneous
Ocean Jasper
Spherulitic Chalcedony (SiO2)
mineral
Greyscale Moonstone / Silver Sheen Moonstone
Potassium Aluminum Silicate (KAlSi3O8)
mineral
Amethyst
SiO2 (Silicon Dioxide with iron impurities)
mineral
Green Quartz (including Prase or Aventurine variants)
Silicon Dioxide (SiO2) with inclusions (likely Actinolite or Chlorite)
mineral
Ocean Jasper
Orbicular Jasper (Silicon Dioxide SiO2)
sedimentary
Amethyst (Chevron Amethyst/Dream Amethyst)
Silicon Dioxide (SiO2) with trace Iron impurities
mineral
Quartzite River Rock
Quartzite
metamorphic
Quartz (Clear/Smoky Geode fragment)
Silicon Dioxide (SiO2)
mineral
Quartzite Beach Pebble
Quartzite (primarily SiO2)
metamorphic
Garnet
Almandine (Fe3Al2(SiO4)3)
mineral
Sandstone Concretion
Ferruginous Sandstone Concretion
sedimentary
Quartz (Milky or Druzy Quartz)
Silicon Dioxide (SiO2)
mineral
Aragonite (Onyx Marble)
Calcium Carbonate (CaCO3), Orthorhombic crystal system
mineral
Sandstone (with Lichen)
Arenite (primarily SiO2)
sedimentary
Amber
Resinite (Succinite if from the Baltic); Chemical Formula: C10H16O (approximate)
Organic Diamond/Gemstone (often associated with Sedimentary sequences)
Dragon Blood Jasper
Quartz (SiO2) with Epidote and Piedmontite inclusions
sedimentary
Ferruginous Sandstone with Concretion
Sandstone (SiO2 dominated with Fe2O3 cement)
sedimentary
Amber
Succinicum (Organic Gemstone - Resinite)
mineraloid
Quartz (Iron-stained)
Silicon Dioxide (SiO2)
mineral