Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Category
Not A Geological Specimen
Browse not a geological specimen specimens identified by the Rock Identifier community.
Man-made Jewelry (Metal and Glass/Plastic)
Synthetic Alloy and Amorphous Solid (SiO2/Polymer)
not a rock
Quartz Pebble (Water-worn)
Silicon Dioxide (SiO2)
mineral
Amber
Resinite (Succinite if from the Baltic); Chemical Formula: C10H16O (approximate)
Organic Diamond/Gemstone (often associated with Sedimentary sequences)
Quartz
Silicon Dioxide (SiO2)
mineral
Amber
Succinicum (Organic Gemstone - Resinite)
mineraloid
Granite Pebble
Granite; primarily composed of Quartz (SiO2), Feldspar (KAlSi3O8), and Mica
igneous
Iron Ore / Ironstone Concretion
Mixture of iron oxide/hydroxide minerals, likely some combination of Hematite (Fe2O3), Goethite (α-FeOOH), and Limonite (a general term for hydrated iron oxides of variable composition) or potentially Bauxite (a mixture of aluminum hydroxides, often with iron oxides, (Al(OH)3) and FeO(OH)). The visual characteristics strongly suggest iron-rich material.
Mineral, specifically an iron ore
Amazonite
Microcline (Amazonstone), K(AlSi3O8)
mineral
Amethyst Sage Agate
Silicon Dioxide (SiO2) with trace minerals (Manganese/Iron oxides)
mineral
Smoky Quartz
Silicon Dioxide (SiO2)
mineral
Amethyst
SiO2 (Silicon Dioxide with iron impurities)
mineral
Banded Calcite (often sold as Caribbean Calcite or Mexican Onyx)
Calcium Carbonate (CaCO3)
mineral
Rutilated Quartz
Silicon Dioxide (SiO2) with Titanium Dioxide (TiO2) inclusions
mineral
Alexandrite
Chrysoberyl (BeAl2O4 with Chromium impurities)
mineral
Tiger's Eye
Pseudomorph of Quartz after Crocidolite (SiO2)
metamorphic
Fire Quartz (Hematoid Quartz)
Silicon Dioxide with Iron Oxide (SiO2 + Fe2O3)
mineral
Rose Quartz
Silicon dioxide with traces of titanium, iron, or manganese (SiO2)
mineral
Moonstone
Orthoclase Feldspar ((K,Na)AlSi3O8)
mineral
Desert Rose
Gypsum (Calcium Sulfate Dihydrate) - CaSO4·2H2O
mineral
Moonstone (Green Moonstone / Garnierite)
Potassium Aluminum Silicate (KAlSi3O8) with inclusions of Garnierite
mineral
Ocean Jasper
Orbicular Jasper (Silicon Dioxide, SiO2)
mineral
Emerald
Beryl (Be3Al2(SiO3)6) with trace Chromium/Vanadium
mineral
Smoky Quartz with Amethyst
Silicon Dioxide (SiO2)
mineral
Petrified Wood (Silicified Wood)
Silicified fossil wood (SiO2)
metamorphic
Vesicular Basalt (Amygdaloidal)
Amygdaloidal Basalt
igneous
Carnelian (Agate/Chalcedony)
Silicon Dioxide (SiO2)
mineral
Almandine Garnet in Matrix
Almandine, Fe3Al2(SiO4)3
metamorphic
Tiger's Eye (and Hematite/Jasper Matrix)
SiO2 (Pseudomorph of Quartz after Crocidolite) with Hematite/Magnetite
mineral
Amethyst
Silicon Dioxide (SiO2) with iron impurities
mineral
Milky Quartz
Quartz (Silicon Dioxide, SiO2)
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
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
Green Quartz (including Prase or Aventurine variants)
Silicon Dioxide (SiO2) with inclusions (likely Actinolite or Chlorite)
mineral
Que Sera Stone (Llanite)
Rhyolite Porphyry with Blue Quartz and Feldspar
igneous
White Precious Opal
Hydrated Silica (SiO2·nH2O)
mineral
Amethyst
SiO2 (Silicon Dioxide with Iron impurities)
mineral
Amethyst (Chevron Amethyst/Dream Amethyst)
Silicon Dioxide (SiO2) with trace Iron impurities
mineral