Red Sandstone
Arenite (primarily SiO2 with hematite/iron oxide coating)
Category
Browse mineral (synthetic) specimens identified by the Rock Identifier community.
Red Sandstone
Arenite (primarily SiO2 with hematite/iron oxide coating)
Ironstone Concretion / Limonite-stained Siltstone
Ironstone (primarily Limonite FeO(OH)·nH2O and Siltstone)
Magnetite
Magnetite (Iron(II,III) oxide, Fe3O4)
Basalt with Epidote/Chlorite
Amygdaloidal Basalt (SiO2 with (Ca2(Al2,Fe)(SiO4)(Si2O7)O(OH)))
Basalt with Calcite Veining
Aphanitic Mafic Igneous Rock (primarily Plagioclase and Pyroxene)
Asphalt Concrete
Bituminous Concrete (Anthropic Rock)
Sandstone (Quartz Arenite)
Sandstone (SiO2 with possible mineral cements)
Quartz (specifically Milky Quartz/Quartzite)
Silicon Dioxide (SiO2)
Black Beauty Meteorite
NWA 7034 (Northwest Africa 7034)
River Cobble (likely Siltstone or Sandstone)
Clastic Sedimentary Rock
Chert (with Quartz vein/coating)
Microcrystalline Quartz (SiO2)
Petrified Wood
Silicified Wood (SiO2)
Granite Pebble
Phaneritic intrusive igneous rock
Diamond in Kimberlite
Kimberlite Matrix with Carbon (Diamond)
Granite
Granite
Granite
Granite
Granite
Granite
Quartz (Raw and Water-worn)
Silicon Dioxide (SiO2)
Rose Quartz
Silicon Dioxide (SiO2)
Sunstone
Oligoclase (Feldspar variety)
Amethyst
Silicon dioxide with iron impurities (SiO2 + Fe3+)
Orbicular Jasper (Ocean Jasper)
Silicon Dioxide (SiO2) with various inclusions
Amazonite
Microcline (variety Amazonite), K(AlSi3O8)
Citrine Quartz
Silicon Dioxide (SiO2) with iron impurities
Chalcopyrite
Chalcopyrite (CuFeS2)
Alexandrite
Chrysoberyl (BeAl2O4 with Chromium impurities)
Limonite Pseudomorph after Pyrite
Limonite (Hydrous iron oxides e.g., FeO(OH)·nH2O) pseudomorphing Pyrite (FeS2)
Herkimer Diamond
Double-terminated Quartz (Silicon Dioxide, SiO2)
Tiger's Eye
Pseudomorph of Quartz after Crocidolite (SiO2)
Amethyst
Silicon Dioxide (SiO2) with trace Iron (Fe3+)
Chalcedony (Botryoidal or Chalcedony Rose)
Silicon dioxide (SiO2)
Quartz (Clear Quartz/Rock Crystal)
Silicon Dioxide (SiO2)
Gold Nugget (Placer Gold)
Native Gold (Au)
Quartz (Clear Quartz/Rock Crystal)
Silicon Dioxide (SiO2)
Moonstone
Orthoclase Feldspar ((K,Na)AlSi3O8)
Arfvedsonite with Garnet
Na3(Fe2+,Mg)4Fe3+Si8O22(OH)2
Ruby in Quartz with Tourmaline
Corundum (Al2O3) in Silicon Dioxide (SiO2) with Schorl
Almandine Garnet
Almandine (Fe3Al2(SiO4)3)
Tiger's Eye
Pseudomorph of Quartz after Crocidolite (SiO2)
Almandine Garnet in Matrix
Almandine, Fe3Al2(SiO4)3
Quartz (Clear Quartz)
Silicon Dioxide (SiO2)
Carnelian (Chalcedony)
Silicon Dioxide (SiO2)