Quartz / Quartzite
Silicon Dioxide (SiO2)
metamorphic
Category
Mineral Based Alloy (Anthropogenic)
Browse mineral based alloy (anthropogenic) specimens identified by the Rock Identifier community.
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Iron Meteorite (Candidate)
Iron Meteorite (Siderite)
mineral
Sandstone (Quartz Sandstone)
Arenite (primarily SiO2)
sedimentary
Silver Nuggets (Natural or Cast)
Native Silver (Ag)
mineral
Bivalve Fossil
Bivalvia (Phylum Mollusca)
Fossil
Sandstone (Ferruginous)
Arenite with Iron Oxide cement (primarily SiO2 with Fe2O3)
sedimentary
Moss Agate
Silicon Dioxide (SiO2) with inclusions
mineral
Rhodonite
Manganese silicate (Mn,Fe,Mg,Ca)SiO3
mineral
Conglomerate
Conglomerate (clastic sedimentary rock)
sedimentary
Granodiorite
Granodiorite
igneous
Chondrite Meteorite
Ordinary Chondrite (L or H Type)
Mineral
Rose quartz (likely)
Quartz, silicon dioxide (SiO₂), pink variety
mineral
Bismuth crystal
Bismuth (Bi), commonly laboratory-grown hopper crystal
mineral
Silver-gray metallic ore, possibly galena-bearing rock
Likely galena (PbS) in a host rock, but identification is uncertain from the photograph
mineral
Pink Feldspar / Rhodochrosite (Tumbled Pink Quartzite)
SiO2 (Quartz) / KAlSi3O8 (Potassium Feldspar)
mineral
Graphite
Graphite (Carbon, C)
mineral
Gold Nugget
Native Gold (Au)
mineral
Ferruginous Quartz
Silicon Dioxide (SiO2) with Hematite/Limonite impurities
mineral
Iron Slag
Ferrous Slag (Industrial Byproduct)
mineraloid (anthropogenic byproduct)
Red Sandstone
Arenite (composed primarily of Quartz and Iron Oxide)
sedimentary
Conglomerate
Clastic sedimentary rock (Puddingstone)
sedimentary
Sandstone (Weathered)
Arenite (primarily SiO2)
sedimentary
Green fluorite crystal
Fluorite (calcium fluoride, CaF₂)
mineral
Tiffany Stone
Bertrandite (Be4Si2O7(OH)2) mixed with Fluorite (CaF2), Opal, and Chalcedony
mineral
Silicon
Element Si
mineral
Diorite
Diorite (Intermediate intrusive igneous rock)
igneous
Conglomerate
Conglomerate (clastic sedimentary rock)
sedimentary
Slag (Industrial Byproduct)
Artificial silicate/iron byproduct
Mineral description (Anthropogenic material)
Tumbled greenish chalcedony or serpentine pebble
Likely microcrystalline quartz (chalcedony, SiO₂) or serpentine-group mineral; exact identification requires testing
mineral
Unidentified Dark Mineral or Rock
Indeterminate (Likely Silicon Dioxide or Carbon-based)
mineral
Shale (with Iron Oxide staining)
Fissile Mudstone (primarily Quartz and Clay minerals)
sedimentary
Synthetic Costume Glove (Paws)
Polyethylene terephthalate (Polyester) & Polyurethane blend
Non-geological / Man-made textile
Conglomerate
Conglomerate (clastic sedimentary rock)
sedimentary
Red Sandstone
Arenite (with Iron Oxide / Hematite cementation)
sedimentary
Sandstone
Arenite (composed primarily of Quartz: SiO2)
sedimentary
Blue Sapphire
Corundum (Al2O3)
mineral
White Topaz
Aluminum Silicate Fluoride Hydroxide; Al2SiO4(F,OH)2
mineral
Small rough quartz-family crystal specimens, including likely amethyst and citrine
Quartz, silicon dioxide (SiO₂); purple specimen is likely amethyst, yellow specimen likely citrine or iron-stained quartz
mineral
Sandstone with Magnetite and Iron Staining
Clastic Sedimentary Rock (contains Fe3O4 and Limonite/Hematite)
sedimentary
Sandstone
Sandstone (Quartz-rich Arenite / SiO2)
sedimentary
Fluorite (Green Fluorite on Host Rock)
Fluorite (Calcium Fluoride, CaF2)
mineral
Green Fluorite
Calcium Fluoride (CaF2)
mineral