Clear Quartz
Quartz (Silicon Dioxide, SiO2)
mineral
Category
Not A Geological Specimen
Browse not a geological specimen specimens identified by the Rock Identifier community.
Mahogany Obsidian
Volcanic Glass with Hematite/Magnetite inclusions
igneous
Amethyst Quartz
Silicon Dioxide (SiO2) with iron impurities
mineral
Carnelian
Carnelian (SiO2)
mineral
Blue Calcite
Calcium Carbonate (CaCO3)
mineral
Blue Chalcedony (likely dyed)
Silicon Dioxide (SiO2) - Cryptocrystalline Quartz
mineral
Quartz (Milky or Smoky Quartz)
Quartz (Silicon Dioxide, SiO2)
mineral
Rose Quartz
Quartz (Silicon Dioxide, SiO2)
mineral
Turquoise
Hydrated phosphate of copper and aluminum, CuAl6(PO4)4(OH)8·4H2O
mineral
Moonstone
Orthoclase (Potassium aluminum silicate - KAlSi3O8)
mineral
Jasper with Quartz inclusions
Silicon Dioxide (SiO2)
sedimentary
Red Jasper
Silicon Dioxide (SiO2) - Microcrystalline Quartz
sedimentary
Peach Moonstone
Potassium Aluminum Silicate (KAlSi3O8)
mineral
Carnelian Agate (with Quartz/Chalcedony)
Silicon Dioxide (SiO2) - Microcrystalline Quartz
mineral
Rose Quartz
Silicon dioxide (SiO2) with trace titanium, manganese, or iron
mineral
Basalt (Vesicular/Amygdaloidal or Water-Worn)
Basalt
igneous
Quartz (with inclusions / Sandstone fragment)
Silicon Dioxide (SiO2)
mineral
Quartz (Milky or White Quartz)
Silicon Dioxide (SiO2)
mineral
Sandstone (with Limonite staining)
Arenite (primarily SiO2 with FeO(OH)·nH2O)
sedimentary
Fossil Brachiopod Cast (Atrypa species)
Phylum Brachiopoda, Class Rhynchonellata, Order Atrypida
sedimentary
Carnelian Agate
Silicon Dioxide (SiO2) with iron oxide impurities
mineral
Amygdaloidal Basalt
Amygdaloidal Basalt (Ca-rich Plagioclase, Pyroxene, and Olivine)
igneous
Amygdaloidal Rhyolite (often called Lake Superior Agate relative)
Rhyolite with Calcite/Quartz amygdules (SiO2 and secondary minerals)
igneous
Granite
Granite (Felsic intrusive igneous rock)
igneous
Porphyritic Basalt (with Quartz or Calcite inclusion)
Porphyritic Basalt (Matrix: SiO2/MgO/FeO, Phenocryst: likely Quartz or Calcite)
igneous
Stromatolite
Biogenic Sedimentary Rock (composed predominantly of CaCO3)
sedimentary
Quartz Vein in Host Rock
Silicon Dioxide (SiO2)
mineral with metamorphic or sedimentary host
Petrified Wood
Silicified Wood (primarily SiO2 - Silicon Dioxide)
sedimentary
Ironstone Concretion (Moqui Marble)
Hematite/Goethite Concretion (Fe2O3 / FeO(OH))
sedimentary
Banded Iron Formation (BIF) / Iron Ore
Hematite-Magnetite BIF (Fe2O3 / Fe3O4 mixed with SiO2)
sedimentary
Dyed Agate Slice
Silicon Dioxide (SiO2) - variety of Chalcedony
mineral
Mica Schist (with Muscovite)
Muscovite/Quartz Schist (KAl2(AlSi3O10)(OH)2)
metamorphic
Quartz Vein in Host Rock
Silicon Dioxide (SiO2) within a metamorphic matrix
metamorphic
Quartzite
Quartzite (primarily SiO2)
metamorphic
Yellow Quartzite (River Stone)
Quartzite (primarily SiO2)
metamorphic
Basalt
Africite (Mafic Igneous Rock)
igneous
Basalt
Basalt (Mafic volcanic rock)
igneous
Ferruginous Sandstone (with possible Epidote/Chlorite coloring)
Sandstone (SiO2 dominated with Fe2O3 staining)
sedimentary
Gneiss (specifically Micaceous Gneiss)
Gneiss (High-grade Regional Metamorphic Rock)
metamorphic
Amber
Succinite (specifically for Baltic amber); C10H16O (Variable organic compound)
mineral
Amber
Succinite (with formula approximately C10H16O)
Organic mineraloid
Chert (and/or Chalcedony)
Silicon dioxide (SiO2)
sedimentary