Gold Mineral
Native Gold (Au)
mineral
Category
Mineral (Tectosilicate)
Browse mineral (tectosilicate) specimens identified by the Rock Identifier community.
Learn about Mineral (Tectosilicate) in the encyclopedia
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Granite
Granite
Igneous
Gneiss
Gneiss (High-grade metamorphic rock)
metamorphic
Mixed Mineral Collection
Multi-mineral Assemblage (Quartz, Jasper, Obsidian, Pyrite, etc.)
mineral
Quartz with Mineral Inclusions
Silicon Dioxide (SiO2) with accessory minerals
mineral
Quartz Mineral Specimens
Quartz (Silicon Dioxide, SiO2)
mineral
Amethyst
Amethyst (Silicon Dioxide, SiO2)
mineral
Quartz in Limonite-rich Matrix
Silicon Dioxide (SiO2) with Goethite/Limonite FeO(OH)·nH2O
Mineral in Sedimentary/Secondary host
Spinosaurus fossil (permineralized bone)
Spinosaurus aegyptiacus (Calcium phosphate mineralized with silica/sediment)
sedimentary
Vesicular Basalt
Amygdaloidal Basalt (Mafic extrusive volcanic rock)
Igneous
Gneiss
Gneiss
metamorphic
Banded Sandstone (Water-worn Pebble)
Arenite with mineral banding
sedimentary
Quartz Mineral
Silicon Dioxide (SiO2)
mineral
Quartz Mineral
Silicon Dioxide (SiO2)
mineral
Limonite / Ironstone
Limonite (Hydrated Iron Oxide) - FeO(OH)·nH2O
mineral
Quartzite (with mineral vein)
Metamorphosed Quartz-rich Sandstone (SiO2)
metamorphic
Chrysocolla and Malachite Beads
Hydrated copper silicates (Chrysocolla) and Copper carbonate hydroxide (Malachite)
mineral
Fossil / Permineralized Bone
Tyrannosaurus rex fossil (Hydroxylapatite replaced by various minerals)
sedimentary
Quartz Vein in Sedimentary Rock
Silicon Dioxide (SiO2) with host Chert or Limestone
mineral
Potassium Feldspar (Orthoclase)
Orthoclase (KAlSi3O8)
mineral
Orthoclase Feldspar (Potassium Feldspar)
KAlSi3O8 (Potassium Aluminum Silicate)
mineral
Fossil Shark Tooth
Carcharodon or Carcharias fossil (Vertebrate Fossil)
sedimentary
Rhodochrosite
Manganese Carbonate (MnCO3)
mineral
Gneiss (specifically Banded Gneiss)
Gneiss
metamorphic
Olivine (Peridot)
Magnesium Iron Silicate (Mg,Fe)2SiO4
mineral
Gneiss
Gneiss (a rock type, not a specific mineral with a formula)
Metamorphic Rock
Granite
Granite (composed of Quartz, Feldspar, and Mica)
igneous
Magnetite (Lodestone)
Iron(II,III) oxide (Fe3O4)
mineral
Quartz Pebble
Quartz (Silicon Dioxide - SiO2)
mineral
Limonite Stained Basalt
Hydrated Iron Oxide on Mafic Volcanic Rock (FeO(OH)·nH2O)
igneous
Apatite
Fluorapatite (Ca5(PO4)3F)
mineral
Pyrite
Iron Sulfide (FeS2)
mineral
Mixed Mineral Collection (with Quartz, Beryl, and host rock)
Silicon Dioxide (Quartz), Be3Al2Si6O18 (Beryl), and associated Schist/Pegmatite
mineral
Granite Cobble
Granite
igneous
Blue Apatite
Apatite (Calcium Phosphate) - Ca5(PO4)3(F,Cl,OH)
mineral
Limonite (Ironstone)
Limonite (FeO(OH)·nH2O)
mineral
Quartz Mineral
Silicon dioxide (SiO2)
mineral
Quartz on Schist
Silicon Dioxide (SiO2) on Foliated Metamorphic Rock
metamorphic
Pyrite in Quartz
Iron Sulfide (FeS2) in Silicon Dioxide (SiO2)
Mineral
Fluorite
Calcium fluoride (CaF2)
mineral
Devil's Toenail (Fossil Oyster)
Gryphaea arcuata (Calcium Carbonate, CaCO3)
sedimentary
Prehnite
Prehnite (Ca2Al2Si3O10(OH)2)
mineral