Obsidian (Black)
Obsidian (High-silica volcanic glass)
igneous
Category
Mineraloid (Human Made Geological Specimen)
Browse mineraloid (human made geological specimen) specimens identified by the Rock Identifier community.
Diamond (set in Gold)
Diamond (pure carbon, C)
mineral
Osumilite in Granite Matrix
(K,Na)(Fe,Mg)2(Al,Fe)3(Si,Al)12O30
mineral
Chert / Flint
Cryptocrystalline Quartz (Silicon Dioxide, SiO2)
sedimentary
Ferruginous Quartz
Silicon Dioxide (SiO2) with Limonite/Hematite inclusions
Mineral
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Fuchsite
K(Al,Cr)2(AlSi3O10)(OH)2 (Chromium-rich Muscovite)
mineral
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Desert Rose (also known as Sand Rose)
Gypsum (CaSO4·2H2O) or Barite (BaSO4) with sand inclusions
mineral
Chert (Iron-stained)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Ferruginous Sandstone (Ironstone Nodules)
Ferruginous Sandstone with Limonite/Goethite coating (Fe2O3·H2O)
sedimentary
Amber
Succinite (fossilized tree resin)
Organic Mineraloid
Sandstone with Bedding Planes
Arenite (Sedimentary rock composed primarily of sand-sized minerals)
sedimentary
Amethyst
Amethyst (Silicon Dioxide, SiO2 + Fe4+ impurities)
mineral
Desert Rose
Gypsum (variety Selenite) or Barite, CaSO4·2H2O
mineral
Milky Quartz (Tumbled/Water-worn)
Silicon Dioxide (SiO2)
mineral
Gold Ore in Quartz
Auriferous Quartz (SiO2 with Au inclusions)
mineral
Massive Quartz (Yellow/Citrine variety)
Silicon Dioxide (SiO2)
mineral
Quartzite
Quartzite (primarily SiO2)
metamorphic
Quartzite Pebble
Quartzite (primarily SiO2)
metamorphic
Amber
Succinite (C10H16O)
Mineraloid (Organic)
Pearl (Cultured or Natural)
Aragonite (CaCO3) with Conchiolin
Organic Mineraloid
Amber
Succinite (specifically for Baltic amber); approximate formula C10H16O
organic mineraloid
Amber
Succinite (specific to Baltic amber), fossilized tree resin
Organic Mineraloid
Quartz (Milky Quartz)
Silicon Dioxide (SiO2)
mineral
Pyrite (Fool's Gold)
Iron Sulfide (FeS2)
mineral
Pyrite (on host rock/ore)
Iron Sulfide (FeS2)
mineral
Chert (Jasper)
Microcrystalline Quartz (SiO2)
sedimentary
Pyrite (Fool's Gold)
Iron Sulfide (FeS2)
mineral
Pyrite (on Shale/Matrix)
Iron Disulfide (FeS2)
mineral
Gold (in Opaque Matrix/Jewelry)
Native Gold (Au)
mineral
Botryoidal Agate
Chalcedony (Silicon Dioxide, SiO2)
mineral
Yellow Jasper
Silicon Dioxide (SiO2) with impure Iron inclusions
sedimentary
Amber
Succinicum (Succinite); C10H16O
Mineraloid (Organic)
Charoite
Charoite (K(Ca,Na)2Si4O10(OH,F)·H2O)
metamorphic
Biotite (Black Mica)
Biotite - K(Mg,Fe)3AlSi3O10(F,OH)2
mineral
Druzy Quartz
Quartz (Silicon Dioxide, SiO2)
mineral
Pink Tumbled Quartz (Dyed)
Silicon Dioxide (SiO2)
mineral
Chert (Tan/Brown variety)
Chert (Silicon Dioxide, SiO2)
sedimentary
Fluorite Tower
Fluorite (Calcium Fluoride - CaF2)
mineral
Red Chert (Jasper)
Microcrystalline Quartz (SiO2)
sedimentary
Fluorite
Calcium Fluoride (CaF2)
mineral