Sulfur (on Matrix)
Native Sulfur (S8)
mineral
Category
Mineral (Biogenic)
Browse mineral (biogenic) specimens identified by the Rock Identifier community.
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Schist
Mica Schist
metamorphic
Green Aventurine
Aventurine (variety of Quartz - SiO2)
Mineral_Rock
Quartz Geode
Silicon Dioxide (SiO2)
mineral
Gold Ore (in Quartz/Pyrite)
Native Gold (Au) with Quartz (SiO2) and Pyrite (FeS2)
mineral
Milky Quartz with Pyrite inclusions
Silicon Dioxide (SiO2) with Iron Disulfide (FeS2)
mineral
Manganese Dendrite on Siltstone
Manganese Oxide (pyrolusite or psilomelane) Dendrites
mineral/sedimentary
Pink Halite (Himalayan Salt)
Halite (Sodium Chloride, NaCl)
sedimentary
Diorite
Diorite (Intermediate intrusive igneous rock)
igneous
Amygdaloidal Basalt
Amygdaloidal Basalt (Mafic Volcanic Rock)
igneous
Moss Agate
Silicon Dioxide (SiO2) with mineral inclusions of hornblende or chlorite
Mineral (variety of Chalcedony)
Schist
Schist (variety likely Mica Schist)
metamorphic
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Emerald in Matrix
Beryl (Be3Al2Si6O18) with Chromium/Vanadium impurities
mineral
Diamond
Carbon (C)
mineral
Magnetite
Magnetite (Fe3O4)
mineral
Quartz with Hematite Staining
Silicon Dioxide (SiO2) with Ferric Oxide (Fe2O3) inclusions
mineral
Gold Quartz (Auriferous Quartz)
Silicon Dioxide (SiO2) with trace Gold (Au) and Iron Oxides
mineral
Milky Quartz Pebble
Quartz (Silicon Dioxide - SiO2)
mineral
Milky Quartz
Quartz (Silicon Dioxide, SiO2)
mineral
Lepidolite
K(Li,Al)3(Al,Si,Rb)4O10(F,OH)2
mineral
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Diamond
Carbon (C)
mineral
Diamond
Diamond (C)
mineral
Bismuth
Native Bismuth (Bi)
mineral
Dyed Agate
Chalcedony (SiO2)
mineral
Dyed Howlite (often sold as 'Turquenite')
Calcium Borosilicate Hydroxide (Ca2B5SiO9(OH)5)
mineral
Diamond
Diamond (pure Carbon, C)
mineral
Diamond
Carbon (C) - Native Element
mineral
Red Sandstone
Arenite (ferruginous sandstone)
sedimentary
Petrified Wood
Silicified Wood (primarily Quartz / Chalcedony: SiO2)
sedimentary
Ironstone with Pyrite
Ferruginous Sandstone (Fe2O3) with minor Sulfide minerals (FeS2)
sedimentary
Granite
Phaneritic plutonic rock (SiO2-rich)
igneous
Greenschist (Greenstone River Pebble)
Greenschist (Chlorite Schist)
metamorphic
Diamond
Carbon (C)
mineral
Diamond (Martapura/Borneo Diamond)
Carbon (C) - Diamond
mineral
Diamond (in a jewelry setting)
Carbon (C)
mineral
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Barite
Barium Sulfate (BaSO4)
mineral
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Granitic Pegmatite
Coarse-grained Igneous Rock (Granitic composition: KAlSi3O8, SiO2)
igneous
Limonite/Goethite nodule
Goethite (FeO(OH)) with Hydrated Iron Oxides
mineral