Amethyst (Geode Fragment)
Silicon Dioxide (SiO2 with iron impurities)
mineral
Category
Igneous Or Metamorphic (Base Stone); Anthropogenic (Decoration)
Browse igneous or metamorphic (base stone); anthropogenic (decoration) specimens identified by the Rock Identifier community.
Epidote
Epidote - Ca2(Al2,Fe3+)3(SiO4)3(OH)
mineral
Titanium Aura Quartz (Bismuth-coated Druzy)
Silicon Dioxide (SiO2) with Titanium/Metal vapor coating
mineral
Gneiss
Gneiss (High-grade Metamorphic Rock)
metamorphic
Citrine
Silicon Dioxide (SiO2) with iron impurities
mineral
Greenstone
Metabasalt / Greenschist facies rock
metamorphic
Ferruginous Sandstone (Ironstone Nodules)
Ferruginous Sandstone with Limonite/Goethite coating (Fe2O3·H2O)
sedimentary
Granodiorite (Gneissic texture)
Granodiorite (containing Quartz SiO2, Plagioclase Feldspar, and Biotite)
igneous
Quartz Geode
Quartz (Silicon Dioxide, SiO2) Geode
sedimentary
Greenstone (Epidisite / Chlorite Schist)
Metabasalt (often contains Epidote Ca2Al2(Fe3+,Al)(SiO4)(Si2O7)O(OH) and Chlorite)
metamorphic
Biotite Schist
Biotite Schist (predominantly K(Mg,Fe)3AlSi3O10(OH,F)2)
metamorphic
![Amethyst (Quartz variety) (Amethyst [Silicon Dioxide (SiO2)]) — mineral](https://media.rockidentification.com/b9cee378-cbe9-4518-8022-2ff4232730ab-thumbnail.jpg)
Amethyst (Quartz variety)
Amethyst [Silicon Dioxide (SiO2)]
mineral
Banded Gneiss
Gneiss (High-grade regional metamorphic rock)
metamorphic
Citrine
Silicon Dioxide (SiO2)
mineral
Quartzite Arrowhead (Archaeological Lithic)
Recrystallized Quartz (SiO2)
metamorphic
Quartz (Milky/Smoky variety on matrix)
Silicon Dioxide (SiO2)
mineral
Gneiss
Gneiss (high-grade metamorphic rock typically composed of quartz, feldspar, and mica)
metamorphic
Citrine Quartz
Silicon Dioxide (SiO2)
mineral
Sodalite
Sodalite - Na8(Al6Si6O24)Cl2
mineral
Biotite Mica
Biotite (K(Mg,Fe)3AlSi3O10(OH,F)2)
mineral
Epidote
{Ca2}{Al2Fe3+}(Si2O7)(SiO4)O(OH)
mineral
Blue Quartz with Dumortierite/Magnesio-riebeckite inclusions
Quartz (SiO2) containing Dumortierite (Al7(BO3)(SiO4)3O3)
igneous/metamorphic
Gold Ore in Quartz/Schist
Auriferous Quartz and Sulfide-bearing Schist
Metamorphic/Igneous (Hydrothermal)
Concrete with Exposed Aggregate
Anthropogenic conglomerate (Concrete)
man-made rock (sedimentary analogue)
Coquina / Fossiliferous Limestone
Calcareous bioclastic sedimentary rock (CaCO3)
sedimentary
Labradorite
Labradorite (Plagioclase Feldspar Series - (Ca, Na)(Al, Si)4O8)
mineral
Petrified Wood
Silicified Wood (SiO2)
metamorphic
Chert Arrowhead
Microcrystalline Quartz (SiO2)
sedimentary
Quartzite with Hematite staining
Quartzite (SiO2) with iron oxide inclusions (Fe2O3)
metamorphic
Gneiss
Gneiss (High-grade Regional Metamorphic Rock)
metamorphic
Sodalite
Sodalite - Na8(Al6Si6O24)Cl2
mineral
Yellow Quartzite (River Stone)
Quartzite (composed primarily of Quartz: SiO2)
metamorphic
Ferro-silicate Slag
Industrial Vitrified Slag (High-silica amorphous glass)
Mineral byproduct (Anthropogenic)
Basalt (Porphyritic)
Basalt (Mafic Extrusive Igneous Rock)
igneous
Lava Rock with Fabric Impression
Scoria or Basalt with anthropogenic impressions
igneous
Banded Gneiss
Gneiss (Metamorphic Rock)
metamorphic
Ferro-slag (Leland Blue/Slag Glass)
Anthropogenic Vitreous Silica (Industrial Slag)
igneous
Mixed Tumbled Stones Collection
Mixed Silicates and Carbonates (Quartz, Amorphous Silica, Carbonates)
multiple
Bull Quartz (White Quartz)
Silicon Dioxide (SiO2)
mineral
Petrified Wood
Silicified wood (primarily SiO2)
metamorphic
Painted River Pebble (likely Basalt or Greywacke)
Aphanitic Lithic Clast with Anthropogenic Pigment coating
Sedimentary or Igneous
Citrine Quartz
Citrine (Silicon Dioxide, SiO2)
mineral