Quartz Geode
Silicon Dioxide (SiO2)
mineral
Category
Non Geological
Browse non geological specimens identified by the Rock Identifier community.
Milky Quartz with Iron Staining
Quartz (Silicon Dioxide, SiO2)
mineral
Fuchsite Quartzite
Fuchsite-bearing Quartzite
Metamorphic
Slag (Industrial Glassy Byproduct)
Ferro-silicate Slag
Anthropogenic / Non-Natural
Oak Wood (Wood Grain Pattern)
Quercus (genus)
Organic (Non-rock)
Amazonite (likely mixed with other feldspars/minerals)
Amazonite is a variety of Microcline, which is a tectosilicate mineral, formula KAISi3O8. The mixed beads could include other feldspars or quartz.
Mineral
Crystal Quartz Beads (likely Clear Quartz)
Quartz (SiO₂)
Mineral
Aventurine
Aventurine Quartz (SiO2 with inclusions)
Mineral
Calcite (likely a tumbled specimen)
Calcite (CaCO 3 )
Mineral
Labradorite
Labradorite (a variety of Plagioclase Feldspar), Na(AlSi3O8) to Ca(Al2Si2O8)
Mineral
Petrified Wood
Silicified Wood (SiO2 permineralization)
sedimentary
Petoskey Stone
Hexagonaria percarinata (Fossilized Rugose Coral)
sedimentary
Petrified Wood
Silicified Wood (primarily SiO2 - Silicon Dioxide / Chalcedony)
metamorphic
Pyrite in Shale
Iron Sulfide (FeS2) in Argillaceous Shale
sedimentary
Sandstone with Liesegang Rings
Arenite with Iron Oxide Liesegang Banding
sedimentary
Stromatolite
Biogenic Sedimentary Rock (Lithified microbial mat)
sedimentary
Yellow Jasper
Silicon dioxide (SiO2)
sedimentary
Ironstone Concretion (Moqui Marble variety)
Ferruginous Sandstone Concretion
sedimentary
Brachiopod Fossil (Spiriferid)
Phylum Brachiopoda, Order Spiriferida (CaCO3 - Calcium Carbonate)
sedimentary (fossilized organic remains)
Moqui Marble
Iron Oxide Concretion
sedimentary
Quartz Vein in Siltstone
SiO2 (Quartz) on clastic sedimentary matrix
sedimentary
Petrified Wood
Silicified Wood (SiO2)
sedimentary
Sandstone with Quartz Vein
Arenite with Quartz (SiO2) Infilling
sedimentary
Sandstone (with potential mineral staining/concretions)
Arenite (SiO2 based)
sedimentary
Quartz Geode
Silicon Dioxide (SiO2)
sedimentary
Garnet Schist
Almandine-Mica Schist
metamorphic
Fulgurite
Fulgurite (Lechatelierite-rich fused silica)
mineraloid / sedimentary (secondary formation)
Nickel coin (U.S. currency)
Cupronickel (75% Copper, 25% Nickel alloy)
man-made alloy (metallic)
Septarian Nodule (Dragon Stone)
Septarian Nodule (Calcium Carbonate/Aragonite/Calcite Concretion)
sedimentary
Sandstone (with Iron Siderite Concretion)
Arenite with Ironstone Concretion (FeCO3)
sedimentary
Rugose Coral (Horn Coral Fossil)
Order Rugosa (fossilized in limestone/chert)
sedimentary
Garnet Schist
Garnet-bearing Mica Schist (variety of compositions, often Al2SiO5 with X3Y2(SiO4)3)
metamorphic
Petrified Wood
Silicified Wood (primarily SiO2)
sedimentary
Favosites Fossil (Honeycomb Coral)
Favosites sp. (Extinct genus of tabulate coral)
sedimentary
Gold Ore in Quartz/Matrix
Native Gold (Au) in Quartz (SiO2) matrix
mineral
Diamond Drill Core (Greenschist and Quartzite)
Chlorite Schist / Meta-quartzite (Metamorphic Rock Core Sample)
metamorphic
Fossiliferous Limestone (with Crinoids)
CaCO3 (Calcium Carbonate)
sedimentary
Vesicular Basalt with Xenocrysts
Mafic Igneous Plutonic/Extrusive Complex
igneous
Banded Chert with Quartz Veining
Microcrystalline Quartz (SiO2)
sedimentary
Devil's Toenail
Gryphaea (extinct genus of foam oysters, typically composed of Calcite CaCO3)
sedimentary
Quartz Pebble (with potential iron inclusions)
Silicon Dioxide (SiO2)
mineral
Rose Gold (Copper-Gold Alloy)
Aurum-Cuprum Alloy (Au-Cu)
mineral (native element alloy)